layouts<a class="headerlink" href="#module-bokeh.models.layouts" title="Permalink to this headline">¶

Abstract base class for Row and Column. Do not use directly.

Note

This is an abstract base class used to help organize the hierarchy of Bokeh model types. It is not useful to instantiate on its own.

JSON Prototype

{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "children": [],
  "css_classes": [],
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "18105",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    0,
    0,
    0,
    0
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "sizing_mode": null,
  "spacing": 0,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

`children`	The list of children, which can be other components including plots, rows, columns, and widgets.
`spacing`	The gap between children (in pixels).

Inherited from LayoutDOM

`disabled`	Whether the widget will be disabled when rendered.
`visible`	Whether the component will be visible and a part of a layout.
`width`	The width of the component (in pixels).
`height`	The height of the component (in pixels).
`min_width`	Minimal width of the component (in pixels) if width is adjustable.
`min_height`	Minimal height of the component (in pixels) if height is adjustable.
`max_width`	Maximal width of the component (in pixels) if width is adjustable.
`max_height`	Maximal height of the component (in pixels) if height is adjustable.
`margin`	Allows to create additional space around the component.
`width_policy`	Describes how the component should maintain its width.
`height_policy`	Describes how the component should maintain its height.
`aspect_ratio`	Describes the proportional relationship between component's width and height.
`sizing_mode`	How the component should size itself.
`align`	The alignment point within the parent container.
`background`	Background color of the component.
`css_classes`	A list of CSS class names to add to this DOM element.

Inherited from Model

`model_class_reverse_map`
`id`
`ref`
`struct`	A Bokeh protocol "structure" of this model, i.e. a dict of the form:.
`name`	An arbitrary, user-supplied name for this model.
`tags`	An optional list of arbitrary, user-supplied values to attach to this model.
`js_event_callbacks`	A mapping of event names to lists of `CustomJS` callbacks.
`subscribed_events`	List of events that are subscribed to by Python callbacks.
`js_property_callbacks`	A mapping of attribute names to lists of `CustomJS` callbacks, to be set up on BokehJS side when the document is created.
`syncable`	Indicates whether this model should be synchronized back to a Bokeh server when updated in a web browser.

Inherited from HasDocumentRef

The Document this model is attached to (can be None)

Public Methods:

__init__(*args, **kwargs)

Inherited from Model

`__init_subclass__`()
`__new__`(cls, args, *kwargs)
`__init__`(args, *kwargs)
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`destroy`()	Clean up references to the document and property
`js_on_event`(event, *callbacks)
`js_link`(attr, other, other_attr[, attr_selector])	Link two Bokeh model properties using JavaScript.
`js_on_change`(event, *callbacks)	Attach a `CustomJS` callback to an arbitrary BokehJS model event.
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`references`()	Returns all `Models` that this object has references to.
`select`(selector)	Query this object and all of its references for objects that match the given selector.
`select_one`(selector)	Query this object and all of its references for objects that match the given selector.
`set_select`(selector, updates)	Update objects that match a given selector with the specified attribute/value updates.
`to_json`(include_defaults)	Returns a dictionary of the attributes of this object, containing only "JSON types" (string, number, boolean, none, dict, list).
`to_json_string`(include_defaults)	Returns a JSON string encoding the attributes of this object.
`trigger`(attr, old, new[, hint, setter])

Inherited from HasProps

`__init__`(args, *kwargs)
`__setattr__`(name, value)	Intercept attribute setting on HasProps in order to special case a few situations:
`__getattr__`(name)	Intercept attribute setting on HasProps in order to special case a few situations:
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`equals`(other)	Structural equality of models.
`static_to_serializable`(serializer)
`to_serializable`(serializer)
`set_from_json`(name, json, *[, models, setter])	Set a property value on this object from JSON.
`update`(**kwargs)	Updates the object's properties from the given keyword arguments.
`update_from_json`(json_attributes, *[, ...])	Updates the object's properties from a JSON attributes dictionary.
`lookup`(name, *[, raises])	Find the `PropertyDescriptor` for a Bokeh property on a class, given the property name.
`properties`(*[, _with_props])	Collect the names of properties on this class.
`properties_with_refs`()	Collect the names of all properties on this class that also have references.
`dataspecs`()	Collect the names of all `DataSpec` properties on this class.
`properties_with_values`(*[, ...])	Collect a dict mapping property names to their values.
`query_properties_with_values`(query, *[, ...])	Query the properties values of `HasProps` instances with a predicate.
`themed_values`()	Get any theme-provided overrides.
`apply_theme`(property_values)	Apply a set of theme values which will be used rather than defaults, but will not override application-set values.
`unapply_theme`()	Remove any themed values and restore defaults.

Inherited from HasDocumentRef

__init__(*args, **kwargs)

Inherited from PropertyCallbackManager

`__init__`(args, *kwargs)
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`remove_on_change`(attr, *callbacks)	Remove a callback from this object
`trigger`(attr, old, new[, hint, setter])

Inherited from EventCallbackManager

`__init__`(args, *kwargs)
`on_event`(event, *callbacks)	Run callbacks when the specified event occurs on this Model

align = 'start'¶

Type: Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

The alignment point within the parent container.

This property is useful only if this component is a child element of a layout (e.g. a grid). Self alignment can be overridden by the parent container (e.g. grid track align).

aspect_ratio = None¶

Type: Either(Null, Auto, Float)

Describes the proportional relationship between component’s width and height.

This works if any of component’s dimensions are flexible in size. If set to a number, width / height = aspect_ratio relationship will be maintained. Otherwise, if set to "auto", component’s preferred width and height will be used to determine the aspect (if not set, no aspect will be preserved).

background = None¶

Type: Nullable(Color)

Background color of the component.

children = []¶

Type: List

The list of children, which can be other components including plots, rows, columns, and widgets.

css_classes = []¶

Type: List

A list of CSS class names to add to this DOM element. Note: the class names are simply added as-is, no other guarantees are provided.

It is also permissible to assign from tuples, however these are adapted – the property will always contain a list.

disabled = False¶

Type: Bool

Whether the widget will be disabled when rendered.

If True, the widget will be greyed-out and not responsive to UI events.

height = None¶

Type: Nullable(NonNegativeInt)

The height of the component (in pixels).

This can be either fixed or preferred height, depending on height sizing policy.

height_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its height.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly height pixels. Component will overflow if it can’t fit in the available vertical space.
"fit": Use component’s preferred height (if set) and allow to fit into the available vertical space within the minimum and maximum height bounds (if set). Component’s height neither will be aggressively minimized nor maximized.
"min": Use as little vertical space as possible, not less than the minimum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much vertical space as possible, not more than the maximum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

margin = (0, 0, 0, 0)¶

Type: Nullable(Tuple(Int, Int, Int, Int))

Allows to create additional space around the component. The values in the tuple are ordered as follows - Margin-Top, Margin-Right, Margin-Bottom and Margin-Left, similar to CSS standards. Negative margin values may be used to shrink the space from any direction.

max_height = None¶

Type: Nullable(NonNegativeInt)

Maximal height of the component (in pixels) if height is adjustable.

max_width = None¶

Type: Nullable(NonNegativeInt)

Maximal width of the component (in pixels) if width is adjustable.

min_height = None¶

Type: Nullable(NonNegativeInt)

Minimal height of the component (in pixels) if height is adjustable.

min_width = None¶

Type: Nullable(NonNegativeInt)

Minimal width of the component (in pixels) if width is adjustable.

name = None¶

Type: Nullable(String)

An arbitrary, user-supplied name for this model.

This name can be useful when querying the document to retrieve specific Bokeh models.

>>> plot.circle([1,2,3], [4,5,6], name="temp")
>>> plot.select(name="temp")
[GlyphRenderer(id='399d53f5-73e9-44d9-9527-544b761c7705', ...)]

Note

No uniqueness guarantees or other conditions are enforced on any names that are provided, nor is the name used directly by Bokeh for any reason.

sizing_mode = None¶

Type: Nullable(Enum(SizingMode))

How the component should size itself.

This is a high-level setting for maintaining width and height of the component. To gain more fine grained control over sizing, use width_policy, height_policy and aspect_ratio instead (those take precedence over sizing_mode).

Possible scenarios:

"fixed": Component is not responsive. It will retain its original width and height regardless of any subsequent browser window resize events.
"stretch_width": Component will responsively resize to stretch to the available width, without maintaining any aspect ratio. The height of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_height": Component will responsively resize to stretch to the available height, without maintaining any aspect ratio. The width of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_both": Component is completely responsive, independently in width and height, and will occupy all the available horizontal and vertical space, even if this changes the aspect ratio of the component.
"scale_width": Component will responsively resize to stretch to the available width, while maintaining the original or provided aspect ratio.
"scale_height": Component will responsively resize to stretch to the available height, while maintaining the original or provided aspect ratio.
"scale_both": Component will responsively resize to both the available width and height, while maintaining the original or provided aspect ratio.

spacing = 0¶

Type: Int

The gap between children (in pixels).

syncable = True¶

Type: Bool

Indicates whether this model should be synchronized back to a Bokeh server when updated in a web browser. Setting to False may be useful to reduce network traffic when dealing with frequently updated objects whose updated values we don’t need.

Note

Setting this property to False will prevent any on_change() callbacks on this object from triggering. However, any JS-side callbacks will still work.

tags = []¶

Type: List

An optional list of arbitrary, user-supplied values to attach to this model.

This data can be useful when querying the document to retrieve specific Bokeh models:

>>> r = plot.circle([1,2,3], [4,5,6])
>>> r.tags = ["foo", 10]
>>> plot.select(tags=['foo', 10])
[GlyphRenderer(id='1de4c3df-a83d-480a-899b-fb263d3d5dd9', ...)]

Or simply a convenient way to attach any necessary metadata to a model that can be accessed by CustomJS callbacks, etc.

Note

No uniqueness guarantees or other conditions are enforced on any tags that are provided, nor are the tags used directly by Bokeh for any reason.

visible = True¶

Type: Bool

Whether the component will be visible and a part of a layout.

width = None¶

Type: Nullable(NonNegativeInt)

The width of the component (in pixels).

This can be either fixed or preferred width, depending on width sizing policy.

width_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its width.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly width pixels. Component will overflow if it can’t fit in the available horizontal space.
"fit": Use component’s preferred width (if set) and allow it to fit into the available horizontal space within the minimum and maximum width bounds (if set). Component’s width neither will be aggressively minimized nor maximized.
"min": Use as little horizontal space as possible, not less than the minimum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much horizontal space as possible, not more than the maximum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

apply_theme(property_values: Dict[str, Any]) → None¶

Apply a set of theme values which will be used rather than defaults, but will not override application-set values.

The passed-in dictionary may be kept around as-is and shared with other instances to save memory (so neither the caller nor the HasProps instance should modify it).

Parameters: property_values (dict) – theme values to use in place of defaults
Returns: None

classmethod dataspecs() → Dict[str, DataSpec]¶

Collect the names of all DataSpec properties on this class.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of DataSpec properties
Return type: set[str]

destroy() → None¶: Clean up references to the document and property

equals(other: bokeh.core.has_props.HasProps) → bool¶

Structural equality of models.

Parameters: other (HasProps) – the other instance to compare to
Returns: True, if properties are structurally equal, otherwise False

js_link(attr: str, other: Model, other_attr: str, attr_selector: int | str | None = None) → None¶

Link two Bokeh model properties using JavaScript.

This is a convenience method that simplifies adding a CustomJS callback to update one Bokeh model property whenever another changes value.

Parameters

attr (str) – The name of a Bokeh property on this model
other (Model) – A Bokeh model to link to self.attr
other_attr (str) – The property on other to link together
attr_selector (Union[int, str]) – The index to link an item in a subscriptable attr

Added in version 1.1

Raises: ValueError –

Examples

This code with js_link:

select.js_link('value', plot, 'sizing_mode')

is equivalent to the following:

from bokeh.models import CustomJS
select.js_on_change('value',
    CustomJS(args=dict(other=plot),
             code="other.sizing_mode = this.value"
    )
)

Additionally, to use attr_selector to attach the left side of a range slider to a plot’s x_range:

range_slider.js_link('value', plot.x_range, 'start', attr_selector=0)

which is equivalent to:

from bokeh.models import CustomJS
range_slider.js_on_change('value',
    CustomJS(args=dict(other=plot.x_range),
             code="other.start = this.value[0]"
    )
)

js_on_change(event: str, *callbacks: JSEventCallback) → None¶

Attach a CustomJS callback to an arbitrary BokehJS model event.

On the BokehJS side, change events for model properties have the form "change:property_name". As a convenience, if the event name passed to this method is also the name of a property on the model, then it will be prefixed with "change:" automatically:

# these two are equivalent
source.js_on_change('data', callback)
source.js_on_change('change:data', callback)

However, there are other kinds of events that can be useful to respond to, in addition to property change events. For example to run a callback whenever data is streamed to a ColumnDataSource, use the "stream" event on the source:

source.js_on_change('streaming', callback)

classmethod lookup(name: str, *, raises: bool = True) → PropertyDescriptor[Any] | None¶

Find the PropertyDescriptor for a Bokeh property on a class, given the property name.

Parameters

name (str) – name of the property to search for
raises (bool) – whether to raise or return None if missing

Returns

descriptor for property named name

Return type

on_change(attr: str, *callbacks: PropertyCallback) → None¶

Add a callback on this object to trigger when attr changes.

Parameters

attr (str) – an attribute name on this object
*callbacks (callable) – callback functions to register

Returns

None

Example:

widget.on_change('value', callback1, callback2, ..., callback_n)

on_event(event: str | Type[Event], *callbacks: EventCallback) → None¶

Run callbacks when the specified event occurs on this Model

Not all Events are supported for all Models. See specific Events in bokeh.events for more information on which Models are able to trigger them.

classmethod properties(*, _with_props: bool = False) → Union[Set[str], Dict[str, Property[Any]]]¶

Collect the names of properties on this class.

Warning

In a future version of Bokeh, this method will return a dictionary mapping property names to property objects. To future-proof this current usage of this method, wrap the return value in list.

Returns: property names

classmethod properties_with_refs() → Dict[str, Property[Any]]¶

Collect the names of all properties on this class that also have references.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of properties that have references
Return type: set[str]

properties_with_values(*, include_defaults: bool = True, include_undefined: bool = False) → Dict[str, Any]¶

Collect a dict mapping property names to their values.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Non-serializable properties are skipped and property values are in “serialized” format which may be slightly different from the values you would normally read from the properties; the intent of this method is to return the information needed to losslessly reconstitute the object instance.

Parameters: include_defaults (bool, optional) – Whether to include properties that haven’t been explicitly set since the object was created. (default: True)
Returns: mapping from property names to their values
Return type: dict

query_properties_with_values(query: Callable[[bokeh.core.property.descriptors.PropertyDescriptor[Any]], bool], *, include_defaults: bool = True, include_undefined: bool = False) → Dict[str, Any]¶

Query the properties values of HasProps instances with a predicate.

Parameters

query (callable) – A callable that accepts property descriptors and returns True or False
include_defaults (bool, optional) – Whether to include properties that have not been explicitly set by a user (default: True)

Returns

mapping of property names and values for matching properties

Return type

references() → Set[bokeh.model.model.Model]¶: Returns all Models that this object has references to.

remove_on_change(attr: str, *callbacks: Callable[[str, Any, Any], None]) → None¶: Remove a callback from this object

select(selector: SelectorType) → Iterable[Model]¶

Query this object and all of its references for objects that match the given selector.

Parameters: selector (JSON-like) –
Returns: seq[Model]

select_one(selector: SelectorType) → Model | None¶

Query this object and all of its references for objects that match the given selector. Raises an error if more than one object is found. Returns single matching object, or None if nothing is found :param selector: :type selector: JSON-like

Returns: Model

set_from_json(name: str, json: JSON, *, models: Dict[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Set a property value on this object from JSON.

Parameters

name – (str) : name of the attribute to set
json – (JSON-value) : value to set to the attribute to
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

set_select(selector: Type[Model] | SelectorType, updates: Dict[str, Unknown]) → None¶

Update objects that match a given selector with the specified attribute/value updates.

Parameters

selector (JSON-like) –
updates (dict) –

Returns

None

themed_values() → Dict[str, Unknown] | None¶

Get any theme-provided overrides.

Results are returned as a dict from property name to value, or None if no theme overrides any values for this instance.

Returns: dict or None

to_json(include_defaults: bool) → JSON¶

Returns a dictionary of the attributes of this object, containing only “JSON types” (string, number, boolean, none, dict, list).

References to other objects are serialized as “refs” (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

to_json_string(include_defaults: bool) → str¶

Returns a JSON string encoding the attributes of this object.

References to other objects are serialized as references (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json_string() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

trigger(attr: str, old: Unknown, new: Unknown, hint: DocumentPatchedEvent | None = None, setter: Setter | None = None) → None¶

unapply_theme() → None¶

Remove any themed values and restore defaults.

Returns: None

update(**kwargs: Any) → None¶

Updates the object’s properties from the given keyword arguments.

Returns: None

Examples

The following are equivalent:

from bokeh.models import Range1d

r = Range1d

# set properties individually:
r.start = 10
r.end = 20

# update properties together:
r.update(start=10, end=20)

update_from_json(json_attributes: Dict[str, JSON], *, models: Mapping[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Updates the object’s properties from a JSON attributes dictionary.

Parameters

json_attributes – (JSON-dict) : attributes and values to update
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

property document: Document | None¶: The Document this model is attached to (can be None)

property struct: bokeh.core.types.ReferenceJson¶

A Bokeh protocol “structure” of this model, i.e. a dict of the form:

{
    'type' : << view model name >>
    'id'   : << unique model id >>
}

Additionally there may be a subtype field if this model is a subtype.

Column¶

class Column(*args, **kwargs)[source]¶

Bases: bokeh.models.layouts.Box

Lay out child components in a single vertical row.

Children can be specified as positional arguments, as a single argument that is a sequence, or using the children keyword argument.

JSON Prototype

{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "children": [],
  "css_classes": [],
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "18127",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    0,
    0,
    0,
    0
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "rows": "auto",
  "sizing_mode": null,
  "spacing": 0,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

rows

Describes how the component should maintain its rows' heights.

Inherited from Box

`children`	The list of children, which can be other components including plots, rows, columns, and widgets.
`spacing`	The gap between children (in pixels).

Inherited from LayoutDOM

`disabled`	Whether the widget will be disabled when rendered.
`visible`	Whether the component will be visible and a part of a layout.
`width`	The width of the component (in pixels).
`height`	The height of the component (in pixels).
`min_width`	Minimal width of the component (in pixels) if width is adjustable.
`min_height`	Minimal height of the component (in pixels) if height is adjustable.
`max_width`	Maximal width of the component (in pixels) if width is adjustable.
`max_height`	Maximal height of the component (in pixels) if height is adjustable.
`margin`	Allows to create additional space around the component.
`width_policy`	Describes how the component should maintain its width.
`height_policy`	Describes how the component should maintain its height.
`aspect_ratio`	Describes the proportional relationship between component's width and height.
`sizing_mode`	How the component should size itself.
`align`	The alignment point within the parent container.
`background`	Background color of the component.
`css_classes`	A list of CSS class names to add to this DOM element.

Inherited from Model

`model_class_reverse_map`
`id`
`ref`
`struct`	A Bokeh protocol "structure" of this model, i.e. a dict of the form:.
`name`	An arbitrary, user-supplied name for this model.
`tags`	An optional list of arbitrary, user-supplied values to attach to this model.
`js_event_callbacks`	A mapping of event names to lists of `CustomJS` callbacks.
`subscribed_events`	List of events that are subscribed to by Python callbacks.
`js_property_callbacks`	A mapping of attribute names to lists of `CustomJS` callbacks, to be set up on BokehJS side when the document is created.
`syncable`	Indicates whether this model should be synchronized back to a Bokeh server when updated in a web browser.

Inherited from HasDocumentRef

The Document this model is attached to (can be None)

Public Methods:

Inherited from Box

__init__(*args, **kwargs)

Inherited from Model

`__init_subclass__`()
`__new__`(cls, args, *kwargs)
`__init__`(args, *kwargs)
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`destroy`()	Clean up references to the document and property
`js_on_event`(event, *callbacks)
`js_link`(attr, other, other_attr[, attr_selector])	Link two Bokeh model properties using JavaScript.
`js_on_change`(event, *callbacks)	Attach a `CustomJS` callback to an arbitrary BokehJS model event.
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`references`()	Returns all `Models` that this object has references to.
`select`(selector)	Query this object and all of its references for objects that match the given selector.
`select_one`(selector)	Query this object and all of its references for objects that match the given selector.
`set_select`(selector, updates)	Update objects that match a given selector with the specified attribute/value updates.
`to_json`(include_defaults)	Returns a dictionary of the attributes of this object, containing only "JSON types" (string, number, boolean, none, dict, list).
`to_json_string`(include_defaults)	Returns a JSON string encoding the attributes of this object.
`trigger`(attr, old, new[, hint, setter])

Inherited from HasProps

`__init__`(args, *kwargs)
`__setattr__`(name, value)	Intercept attribute setting on HasProps in order to special case a few situations:
`__getattr__`(name)	Intercept attribute setting on HasProps in order to special case a few situations:
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`equals`(other)	Structural equality of models.
`static_to_serializable`(serializer)
`to_serializable`(serializer)
`set_from_json`(name, json, *[, models, setter])	Set a property value on this object from JSON.
`update`(**kwargs)	Updates the object's properties from the given keyword arguments.
`update_from_json`(json_attributes, *[, ...])	Updates the object's properties from a JSON attributes dictionary.
`lookup`(name, *[, raises])	Find the `PropertyDescriptor` for a Bokeh property on a class, given the property name.
`properties`(*[, _with_props])	Collect the names of properties on this class.
`properties_with_refs`()	Collect the names of all properties on this class that also have references.
`dataspecs`()	Collect the names of all `DataSpec` properties on this class.
`properties_with_values`(*[, ...])	Collect a dict mapping property names to their values.
`query_properties_with_values`(query, *[, ...])	Query the properties values of `HasProps` instances with a predicate.
`themed_values`()	Get any theme-provided overrides.
`apply_theme`(property_values)	Apply a set of theme values which will be used rather than defaults, but will not override application-set values.
`unapply_theme`()	Remove any themed values and restore defaults.

Inherited from HasDocumentRef

__init__(*args, **kwargs)

Inherited from PropertyCallbackManager

`__init__`(args, *kwargs)
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`remove_on_change`(attr, *callbacks)	Remove a callback from this object
`trigger`(attr, old, new[, hint, setter])

Inherited from EventCallbackManager

`__init__`(args, *kwargs)
`on_event`(event, *callbacks)	Run callbacks when the specified event occurs on this Model

align = 'start'¶

Type: Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

The alignment point within the parent container.

This property is useful only if this component is a child element of a layout (e.g. a grid). Self alignment can be overridden by the parent container (e.g. grid track align).

aspect_ratio = None¶

Type: Either(Null, Auto, Float)

Describes the proportional relationship between component’s width and height.

background = None¶

Type: Nullable(Color)

Background color of the component.

children = []¶

Type: List

The list of children, which can be other components including plots, rows, columns, and widgets.

css_classes = []¶

Type: List

A list of CSS class names to add to this DOM element. Note: the class names are simply added as-is, no other guarantees are provided.

It is also permissible to assign from tuples, however these are adapted – the property will always contain a list.

disabled = False¶

Type: Bool

Whether the widget will be disabled when rendered.

If True, the widget will be greyed-out and not responsive to UI events.

height = None¶

Type: Nullable(NonNegativeInt)

The height of the component (in pixels).

This can be either fixed or preferred height, depending on height sizing policy.

height_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its height.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly height pixels. Component will overflow if it can’t fit in the available vertical space.
"fit": Use component’s preferred height (if set) and allow to fit into the available vertical space within the minimum and maximum height bounds (if set). Component’s height neither will be aggressively minimized nor maximized.
"min": Use as little vertical space as possible, not less than the minimum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much vertical space as possible, not more than the maximum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

margin = (0, 0, 0, 0)¶

Type: Nullable(Tuple(Int, Int, Int, Int))

max_height = None¶

Type: Nullable(NonNegativeInt)

Maximal height of the component (in pixels) if height is adjustable.

max_width = None¶

Type: Nullable(NonNegativeInt)

Maximal width of the component (in pixels) if width is adjustable.

min_height = None¶

Type: Nullable(NonNegativeInt)

Minimal height of the component (in pixels) if height is adjustable.

min_width = None¶

Type: Nullable(NonNegativeInt)

Minimal width of the component (in pixels) if width is adjustable.

name = None¶

Type: Nullable(String)

An arbitrary, user-supplied name for this model.

This name can be useful when querying the document to retrieve specific Bokeh models.

>>> plot.circle([1,2,3], [4,5,6], name="temp")
>>> plot.select(name="temp")
[GlyphRenderer(id='399d53f5-73e9-44d9-9527-544b761c7705', ...)]

Note

No uniqueness guarantees or other conditions are enforced on any names that are provided, nor is the name used directly by Bokeh for any reason.

rows = 'auto'¶

Type: Either(Either(Enum(Enumeration(auto, min, fit, max)), Int), Dict(Either(Int, String), Either(Either(Enum(Enumeration(auto, min, fit, max)), Int), Struct, Struct, Struct)))

Describes how the component should maintain its rows’ heights.

Note

This is an experimental feature and may change in future. Use it at your own discretion.

sizing_mode = None¶

Type: Nullable(Enum(SizingMode))

How the component should size itself.

Possible scenarios:

"fixed": Component is not responsive. It will retain its original width and height regardless of any subsequent browser window resize events.
"stretch_width": Component will responsively resize to stretch to the available width, without maintaining any aspect ratio. The height of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_height": Component will responsively resize to stretch to the available height, without maintaining any aspect ratio. The width of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_both": Component is completely responsive, independently in width and height, and will occupy all the available horizontal and vertical space, even if this changes the aspect ratio of the component.
"scale_width": Component will responsively resize to stretch to the available width, while maintaining the original or provided aspect ratio.
"scale_height": Component will responsively resize to stretch to the available height, while maintaining the original or provided aspect ratio.
"scale_both": Component will responsively resize to both the available width and height, while maintaining the original or provided aspect ratio.

spacing = 0¶

Type: Int

The gap between children (in pixels).

syncable = True¶

Type: Bool

Note

Setting this property to False will prevent any on_change() callbacks on this object from triggering. However, any JS-side callbacks will still work.

tags = []¶

Type: List

An optional list of arbitrary, user-supplied values to attach to this model.

This data can be useful when querying the document to retrieve specific Bokeh models:

>>> r = plot.circle([1,2,3], [4,5,6])
>>> r.tags = ["foo", 10]
>>> plot.select(tags=['foo', 10])
[GlyphRenderer(id='1de4c3df-a83d-480a-899b-fb263d3d5dd9', ...)]

Or simply a convenient way to attach any necessary metadata to a model that can be accessed by CustomJS callbacks, etc.

Note

No uniqueness guarantees or other conditions are enforced on any tags that are provided, nor are the tags used directly by Bokeh for any reason.

visible = True¶

Type: Bool

Whether the component will be visible and a part of a layout.

width = None¶

Type: Nullable(NonNegativeInt)

The width of the component (in pixels).

This can be either fixed or preferred width, depending on width sizing policy.

width_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its width.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly width pixels. Component will overflow if it can’t fit in the available horizontal space.
"fit": Use component’s preferred width (if set) and allow it to fit into the available horizontal space within the minimum and maximum width bounds (if set). Component’s width neither will be aggressively minimized nor maximized.
"min": Use as little horizontal space as possible, not less than the minimum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much horizontal space as possible, not more than the maximum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

apply_theme(property_values: Dict[str, Any]) → None¶

Apply a set of theme values which will be used rather than defaults, but will not override application-set values.

The passed-in dictionary may be kept around as-is and shared with other instances to save memory (so neither the caller nor the HasProps instance should modify it).

Parameters: property_values (dict) – theme values to use in place of defaults
Returns: None

classmethod dataspecs() → Dict[str, DataSpec]¶

Collect the names of all DataSpec properties on this class.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of DataSpec properties
Return type: set[str]

destroy() → None¶: Clean up references to the document and property

equals(other: bokeh.core.has_props.HasProps) → bool¶

Structural equality of models.

Parameters: other (HasProps) – the other instance to compare to
Returns: True, if properties are structurally equal, otherwise False

js_link(attr: str, other: Model, other_attr: str, attr_selector: int | str | None = None) → None¶

Link two Bokeh model properties using JavaScript.

This is a convenience method that simplifies adding a CustomJS callback to update one Bokeh model property whenever another changes value.

Parameters

attr (str) – The name of a Bokeh property on this model
other (Model) – A Bokeh model to link to self.attr
other_attr (str) – The property on other to link together
attr_selector (Union[int, str]) – The index to link an item in a subscriptable attr

Added in version 1.1

Raises: ValueError –

Examples

This code with js_link:

select.js_link('value', plot, 'sizing_mode')

is equivalent to the following:

from bokeh.models import CustomJS
select.js_on_change('value',
    CustomJS(args=dict(other=plot),
             code="other.sizing_mode = this.value"
    )
)

Additionally, to use attr_selector to attach the left side of a range slider to a plot’s x_range:

range_slider.js_link('value', plot.x_range, 'start', attr_selector=0)

which is equivalent to:

from bokeh.models import CustomJS
range_slider.js_on_change('value',
    CustomJS(args=dict(other=plot.x_range),
             code="other.start = this.value[0]"
    )
)

js_on_change(event: str, *callbacks: JSEventCallback) → None¶

Attach a CustomJS callback to an arbitrary BokehJS model event.

# these two are equivalent
source.js_on_change('data', callback)
source.js_on_change('change:data', callback)

source.js_on_change('streaming', callback)

classmethod lookup(name: str, *, raises: bool = True) → PropertyDescriptor[Any] | None¶

Find the PropertyDescriptor for a Bokeh property on a class, given the property name.

Parameters

name (str) – name of the property to search for
raises (bool) – whether to raise or return None if missing

Returns

descriptor for property named name

Return type

on_change(attr: str, *callbacks: PropertyCallback) → None¶

Add a callback on this object to trigger when attr changes.

Parameters

attr (str) – an attribute name on this object
*callbacks (callable) – callback functions to register

Returns

None

Example:

widget.on_change('value', callback1, callback2, ..., callback_n)

on_event(event: str | Type[Event], *callbacks: EventCallback) → None¶

Run callbacks when the specified event occurs on this Model

Not all Events are supported for all Models. See specific Events in bokeh.events for more information on which Models are able to trigger them.

classmethod properties(*, _with_props: bool = False) → Union[Set[str], Dict[str, Property[Any]]]¶

Collect the names of properties on this class.

Warning

In a future version of Bokeh, this method will return a dictionary mapping property names to property objects. To future-proof this current usage of this method, wrap the return value in list.

Returns: property names

classmethod properties_with_refs() → Dict[str, Property[Any]]¶

Collect the names of all properties on this class that also have references.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of properties that have references
Return type: set[str]

properties_with_values(*, include_defaults: bool = True, include_undefined: bool = False) → Dict[str, Any]¶

Collect a dict mapping property names to their values.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Parameters: include_defaults (bool, optional) – Whether to include properties that haven’t been explicitly set since the object was created. (default: True)
Returns: mapping from property names to their values
Return type: dict

Query the properties values of HasProps instances with a predicate.

Parameters

query (callable) – A callable that accepts property descriptors and returns True or False
include_defaults (bool, optional) – Whether to include properties that have not been explicitly set by a user (default: True)

Returns

mapping of property names and values for matching properties

Return type

references() → Set[bokeh.model.model.Model]¶: Returns all Models that this object has references to.

remove_on_change(attr: str, *callbacks: Callable[[str, Any, Any], None]) → None¶: Remove a callback from this object

select(selector: SelectorType) → Iterable[Model]¶

Query this object and all of its references for objects that match the given selector.

Parameters: selector (JSON-like) –
Returns: seq[Model]

select_one(selector: SelectorType) → Model | None¶

Returns: Model

set_from_json(name: str, json: JSON, *, models: Dict[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Set a property value on this object from JSON.

Parameters

name – (str) : name of the attribute to set
json – (JSON-value) : value to set to the attribute to
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

set_select(selector: Type[Model] | SelectorType, updates: Dict[str, Unknown]) → None¶

Update objects that match a given selector with the specified attribute/value updates.

Parameters

selector (JSON-like) –
updates (dict) –

Returns

None

themed_values() → Dict[str, Unknown] | None¶

Get any theme-provided overrides.

Results are returned as a dict from property name to value, or None if no theme overrides any values for this instance.

Returns: dict or None

to_json(include_defaults: bool) → JSON¶

Returns a dictionary of the attributes of this object, containing only “JSON types” (string, number, boolean, none, dict, list).

References to other objects are serialized as “refs” (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

to_json_string(include_defaults: bool) → str¶

Returns a JSON string encoding the attributes of this object.

References to other objects are serialized as references (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json_string() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

trigger(attr: str, old: Unknown, new: Unknown, hint: DocumentPatchedEvent | None = None, setter: Setter | None = None) → None¶

unapply_theme() → None¶

Remove any themed values and restore defaults.

Returns: None

update(**kwargs: Any) → None¶

Updates the object’s properties from the given keyword arguments.

Returns: None

Examples

The following are equivalent:

from bokeh.models import Range1d

r = Range1d

# set properties individually:
r.start = 10
r.end = 20

# update properties together:
r.update(start=10, end=20)

update_from_json(json_attributes: Dict[str, JSON], *, models: Mapping[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Updates the object’s properties from a JSON attributes dictionary.

Parameters

json_attributes – (JSON-dict) : attributes and values to update
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

property document: Document | None¶: The Document this model is attached to (can be None)

property struct: bokeh.core.types.ReferenceJson¶

A Bokeh protocol “structure” of this model, i.e. a dict of the form:

{
    'type' : << view model name >>
    'id'   : << unique model id >>
}

Additionally there may be a subtype field if this model is a subtype.

GridBox¶

class GridBox(*args, **kwargs)[source]¶

JSON Prototype

{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "children": [],
  "cols": "auto",
  "css_classes": [],
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "18150",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    0,
    0,
    0,
    0
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "rows": "auto",
  "sizing_mode": null,
  "spacing": 0,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

`children`	A list of children with their associated position in the grid (row, column).
`rows`	Describes how the grid should maintain its rows' heights.
`cols`	Describes how the grid should maintain its columns' widths.
`spacing`	The gap between children (in pixels).

Inherited from LayoutDOM

`disabled`	Whether the widget will be disabled when rendered.
`visible`	Whether the component will be visible and a part of a layout.
`width`	The width of the component (in pixels).
`height`	The height of the component (in pixels).
`min_width`	Minimal width of the component (in pixels) if width is adjustable.
`min_height`	Minimal height of the component (in pixels) if height is adjustable.
`max_width`	Maximal width of the component (in pixels) if width is adjustable.
`max_height`	Maximal height of the component (in pixels) if height is adjustable.
`margin`	Allows to create additional space around the component.
`width_policy`	Describes how the component should maintain its width.
`height_policy`	Describes how the component should maintain its height.
`aspect_ratio`	Describes the proportional relationship between component's width and height.
`sizing_mode`	How the component should size itself.
`align`	The alignment point within the parent container.
`background`	Background color of the component.
`css_classes`	A list of CSS class names to add to this DOM element.

Inherited from Model

`model_class_reverse_map`
`id`
`ref`
`struct`	A Bokeh protocol "structure" of this model, i.e. a dict of the form:.
`name`	An arbitrary, user-supplied name for this model.
`tags`	An optional list of arbitrary, user-supplied values to attach to this model.
`js_event_callbacks`	A mapping of event names to lists of `CustomJS` callbacks.
`subscribed_events`	List of events that are subscribed to by Python callbacks.
`js_property_callbacks`	A mapping of attribute names to lists of `CustomJS` callbacks, to be set up on BokehJS side when the document is created.
`syncable`	Indicates whether this model should be synchronized back to a Bokeh server when updated in a web browser.

Inherited from HasDocumentRef

The Document this model is attached to (can be None)

Public Methods:

Inherited from Model

`__init_subclass__`()
`__new__`(cls, args, *kwargs)
`__init__`(**kwargs)
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`destroy`()	Clean up references to the document and property
`js_on_event`(event, *callbacks)
`js_link`(attr, other, other_attr[, attr_selector])	Link two Bokeh model properties using JavaScript.
`js_on_change`(event, *callbacks)	Attach a `CustomJS` callback to an arbitrary BokehJS model event.
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`references`()	Returns all `Models` that this object has references to.
`select`(selector)	Query this object and all of its references for objects that match the given selector.
`select_one`(selector)	Query this object and all of its references for objects that match the given selector.
`set_select`(selector, updates)	Update objects that match a given selector with the specified attribute/value updates.
`to_json`(include_defaults)	Returns a dictionary of the attributes of this object, containing only "JSON types" (string, number, boolean, none, dict, list).
`to_json_string`(include_defaults)	Returns a JSON string encoding the attributes of this object.
`trigger`(attr, old, new[, hint, setter])

Inherited from HasProps

`__init__`(**kwargs)
`__setattr__`(name, value)	Intercept attribute setting on HasProps in order to special case a few situations:
`__getattr__`(name)	Intercept attribute setting on HasProps in order to special case a few situations:
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`equals`(other)	Structural equality of models.
`static_to_serializable`(serializer)
`to_serializable`(serializer)
`set_from_json`(name, json, *[, models, setter])	Set a property value on this object from JSON.
`update`(**kwargs)	Updates the object's properties from the given keyword arguments.
`update_from_json`(json_attributes, *[, ...])	Updates the object's properties from a JSON attributes dictionary.
`lookup`(name, *[, raises])	Find the `PropertyDescriptor` for a Bokeh property on a class, given the property name.
`properties`(*[, _with_props])	Collect the names of properties on this class.
`properties_with_refs`()	Collect the names of all properties on this class that also have references.
`dataspecs`()	Collect the names of all `DataSpec` properties on this class.
`properties_with_values`(*[, ...])	Collect a dict mapping property names to their values.
`query_properties_with_values`(query, *[, ...])	Query the properties values of `HasProps` instances with a predicate.
`themed_values`()	Get any theme-provided overrides.
`apply_theme`(property_values)	Apply a set of theme values which will be used rather than defaults, but will not override application-set values.
`unapply_theme`()	Remove any themed values and restore defaults.

Inherited from HasDocumentRef

__init__(**kwargs)

Inherited from PropertyCallbackManager

`__init__`(**kwargs)
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`remove_on_change`(attr, *callbacks)	Remove a callback from this object
`trigger`(attr, old, new[, hint, setter])

Inherited from EventCallbackManager

`__init__`(**kwargs)
`on_event`(event, *callbacks)	Run callbacks when the specified event occurs on this Model

align = 'start'¶

Type: Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

The alignment point within the parent container.

This property is useful only if this component is a child element of a layout (e.g. a grid). Self alignment can be overridden by the parent container (e.g. grid track align).

aspect_ratio = None¶

Type: Either(Null, Auto, Float)

Describes the proportional relationship between component’s width and height.

background = None¶

Type: Nullable(Color)

Background color of the component.

children = []¶

Type: List

A list of children with their associated position in the grid (row, column).

cols = 'auto'¶

Type: Either(Either(Enum(Enumeration(auto, min, fit, max)), Int), Dict(Either(Int, String), Either(Either(Enum(Enumeration(auto, min, fit, max)), Int), Struct, Struct, Struct)))

Describes how the grid should maintain its columns’ widths.

Note

This is an experimental feature and may change in future. Use it at your own discretion.

css_classes = []¶

Type: List

A list of CSS class names to add to this DOM element. Note: the class names are simply added as-is, no other guarantees are provided.

It is also permissible to assign from tuples, however these are adapted – the property will always contain a list.

disabled = False¶

Type: Bool

Whether the widget will be disabled when rendered.

If True, the widget will be greyed-out and not responsive to UI events.

height = None¶

Type: Nullable(NonNegativeInt)

The height of the component (in pixels).

This can be either fixed or preferred height, depending on height sizing policy.

height_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its height.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly height pixels. Component will overflow if it can’t fit in the available vertical space.
"fit": Use component’s preferred height (if set) and allow to fit into the available vertical space within the minimum and maximum height bounds (if set). Component’s height neither will be aggressively minimized nor maximized.
"min": Use as little vertical space as possible, not less than the minimum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much vertical space as possible, not more than the maximum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

margin = (0, 0, 0, 0)¶

Type: Nullable(Tuple(Int, Int, Int, Int))

max_height = None¶

Type: Nullable(NonNegativeInt)

Maximal height of the component (in pixels) if height is adjustable.

max_width = None¶

Type: Nullable(NonNegativeInt)

Maximal width of the component (in pixels) if width is adjustable.

min_height = None¶

Type: Nullable(NonNegativeInt)

Minimal height of the component (in pixels) if height is adjustable.

min_width = None¶

Type: Nullable(NonNegativeInt)

Minimal width of the component (in pixels) if width is adjustable.

name = None¶

Type: Nullable(String)

An arbitrary, user-supplied name for this model.

This name can be useful when querying the document to retrieve specific Bokeh models.

>>> plot.circle([1,2,3], [4,5,6], name="temp")
>>> plot.select(name="temp")
[GlyphRenderer(id='399d53f5-73e9-44d9-9527-544b761c7705', ...)]

Note

No uniqueness guarantees or other conditions are enforced on any names that are provided, nor is the name used directly by Bokeh for any reason.

rows = 'auto'¶

Type: Either(Either(Enum(Enumeration(auto, min, fit, max)), Int), Dict(Either(Int, String), Either(Either(Enum(Enumeration(auto, min, fit, max)), Int), Struct, Struct, Struct)))

Describes how the grid should maintain its rows’ heights.

Note

This is an experimental feature and may change in future. Use it at your own discretion.

sizing_mode = None¶

Type: Nullable(Enum(SizingMode))

How the component should size itself.

Possible scenarios:

"fixed": Component is not responsive. It will retain its original width and height regardless of any subsequent browser window resize events.
"stretch_width": Component will responsively resize to stretch to the available width, without maintaining any aspect ratio. The height of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_height": Component will responsively resize to stretch to the available height, without maintaining any aspect ratio. The width of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_both": Component is completely responsive, independently in width and height, and will occupy all the available horizontal and vertical space, even if this changes the aspect ratio of the component.
"scale_width": Component will responsively resize to stretch to the available width, while maintaining the original or provided aspect ratio.
"scale_height": Component will responsively resize to stretch to the available height, while maintaining the original or provided aspect ratio.
"scale_both": Component will responsively resize to both the available width and height, while maintaining the original or provided aspect ratio.

spacing = 0¶

Type: Either(Int, Tuple(Int, Int))

The gap between children (in pixels).

Either a number, if spacing is the same for both dimensions, or a pair of numbers indicating spacing in the vertical and horizontal dimensions respectively.

syncable = True¶

Type: Bool

Note

Setting this property to False will prevent any on_change() callbacks on this object from triggering. However, any JS-side callbacks will still work.

tags = []¶

Type: List

An optional list of arbitrary, user-supplied values to attach to this model.

This data can be useful when querying the document to retrieve specific Bokeh models:

>>> r = plot.circle([1,2,3], [4,5,6])
>>> r.tags = ["foo", 10]
>>> plot.select(tags=['foo', 10])
[GlyphRenderer(id='1de4c3df-a83d-480a-899b-fb263d3d5dd9', ...)]

Or simply a convenient way to attach any necessary metadata to a model that can be accessed by CustomJS callbacks, etc.

Note

No uniqueness guarantees or other conditions are enforced on any tags that are provided, nor are the tags used directly by Bokeh for any reason.

visible = True¶

Type: Bool

Whether the component will be visible and a part of a layout.

width = None¶

Type: Nullable(NonNegativeInt)

The width of the component (in pixels).

This can be either fixed or preferred width, depending on width sizing policy.

width_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its width.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly width pixels. Component will overflow if it can’t fit in the available horizontal space.
"fit": Use component’s preferred width (if set) and allow it to fit into the available horizontal space within the minimum and maximum width bounds (if set). Component’s width neither will be aggressively minimized nor maximized.
"min": Use as little horizontal space as possible, not less than the minimum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much horizontal space as possible, not more than the maximum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

apply_theme(property_values: Dict[str, Any]) → None¶

Apply a set of theme values which will be used rather than defaults, but will not override application-set values.

The passed-in dictionary may be kept around as-is and shared with other instances to save memory (so neither the caller nor the HasProps instance should modify it).

Parameters: property_values (dict) – theme values to use in place of defaults
Returns: None

classmethod dataspecs() → Dict[str, DataSpec]¶

Collect the names of all DataSpec properties on this class.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of DataSpec properties
Return type: set[str]

destroy() → None¶: Clean up references to the document and property

equals(other: bokeh.core.has_props.HasProps) → bool¶

Structural equality of models.

Parameters: other (HasProps) – the other instance to compare to
Returns: True, if properties are structurally equal, otherwise False

js_link(attr: str, other: Model, other_attr: str, attr_selector: int | str | None = None) → None¶

Link two Bokeh model properties using JavaScript.

This is a convenience method that simplifies adding a CustomJS callback to update one Bokeh model property whenever another changes value.

Parameters

attr (str) – The name of a Bokeh property on this model
other (Model) – A Bokeh model to link to self.attr
other_attr (str) – The property on other to link together
attr_selector (Union[int, str]) – The index to link an item in a subscriptable attr

Added in version 1.1

Raises: ValueError –

Examples

This code with js_link:

select.js_link('value', plot, 'sizing_mode')

is equivalent to the following:

from bokeh.models import CustomJS
select.js_on_change('value',
    CustomJS(args=dict(other=plot),
             code="other.sizing_mode = this.value"
    )
)

Additionally, to use attr_selector to attach the left side of a range slider to a plot’s x_range:

range_slider.js_link('value', plot.x_range, 'start', attr_selector=0)

which is equivalent to:

from bokeh.models import CustomJS
range_slider.js_on_change('value',
    CustomJS(args=dict(other=plot.x_range),
             code="other.start = this.value[0]"
    )
)

js_on_change(event: str, *callbacks: JSEventCallback) → None¶

Attach a CustomJS callback to an arbitrary BokehJS model event.

# these two are equivalent
source.js_on_change('data', callback)
source.js_on_change('change:data', callback)

source.js_on_change('streaming', callback)

classmethod lookup(name: str, *, raises: bool = True) → PropertyDescriptor[Any] | None¶

Find the PropertyDescriptor for a Bokeh property on a class, given the property name.

Parameters

name (str) – name of the property to search for
raises (bool) – whether to raise or return None if missing

Returns

descriptor for property named name

Return type

on_change(attr: str, *callbacks: PropertyCallback) → None¶

Add a callback on this object to trigger when attr changes.

Parameters

attr (str) – an attribute name on this object
*callbacks (callable) – callback functions to register

Returns

None

Example:

widget.on_change('value', callback1, callback2, ..., callback_n)

on_event(event: str | Type[Event], *callbacks: EventCallback) → None¶

Run callbacks when the specified event occurs on this Model

Not all Events are supported for all Models. See specific Events in bokeh.events for more information on which Models are able to trigger them.

classmethod properties(*, _with_props: bool = False) → Union[Set[str], Dict[str, Property[Any]]]¶

Collect the names of properties on this class.

Warning

In a future version of Bokeh, this method will return a dictionary mapping property names to property objects. To future-proof this current usage of this method, wrap the return value in list.

Returns: property names

classmethod properties_with_refs() → Dict[str, Property[Any]]¶

Collect the names of all properties on this class that also have references.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of properties that have references
Return type: set[str]

properties_with_values(*, include_defaults: bool = True, include_undefined: bool = False) → Dict[str, Any]¶

Collect a dict mapping property names to their values.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Parameters: include_defaults (bool, optional) – Whether to include properties that haven’t been explicitly set since the object was created. (default: True)
Returns: mapping from property names to their values
Return type: dict

Query the properties values of HasProps instances with a predicate.

Parameters

query (callable) – A callable that accepts property descriptors and returns True or False
include_defaults (bool, optional) – Whether to include properties that have not been explicitly set by a user (default: True)

Returns

mapping of property names and values for matching properties

Return type

references() → Set[bokeh.model.model.Model]¶: Returns all Models that this object has references to.

remove_on_change(attr: str, *callbacks: Callable[[str, Any, Any], None]) → None¶: Remove a callback from this object

select(selector: SelectorType) → Iterable[Model]¶

Query this object and all of its references for objects that match the given selector.

Parameters: selector (JSON-like) –
Returns: seq[Model]

select_one(selector: SelectorType) → Model | None¶

Returns: Model

set_from_json(name: str, json: JSON, *, models: Dict[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Set a property value on this object from JSON.

Parameters

name – (str) : name of the attribute to set
json – (JSON-value) : value to set to the attribute to
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

set_select(selector: Type[Model] | SelectorType, updates: Dict[str, Unknown]) → None¶

Update objects that match a given selector with the specified attribute/value updates.

Parameters

selector (JSON-like) –
updates (dict) –

Returns

None

themed_values() → Dict[str, Unknown] | None¶

Get any theme-provided overrides.

Results are returned as a dict from property name to value, or None if no theme overrides any values for this instance.

Returns: dict or None

to_json(include_defaults: bool) → JSON¶

Returns a dictionary of the attributes of this object, containing only “JSON types” (string, number, boolean, none, dict, list).

References to other objects are serialized as “refs” (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

to_json_string(include_defaults: bool) → str¶

Returns a JSON string encoding the attributes of this object.

References to other objects are serialized as references (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json_string() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

trigger(attr: str, old: Unknown, new: Unknown, hint: DocumentPatchedEvent | None = None, setter: Setter | None = None) → None¶

unapply_theme() → None¶

Remove any themed values and restore defaults.

Returns: None

update(**kwargs: Any) → None¶

Updates the object’s properties from the given keyword arguments.

Returns: None

Examples

The following are equivalent:

from bokeh.models import Range1d

r = Range1d

# set properties individually:
r.start = 10
r.end = 20

# update properties together:
r.update(start=10, end=20)

update_from_json(json_attributes: Dict[str, JSON], *, models: Mapping[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Updates the object’s properties from a JSON attributes dictionary.

Parameters

json_attributes – (JSON-dict) : attributes and values to update
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

property document: Document | None¶: The Document this model is attached to (can be None)

property struct: bokeh.core.types.ReferenceJson¶

A Bokeh protocol “structure” of this model, i.e. a dict of the form:

{
    'type' : << view model name >>
    'id'   : << unique model id >>
}

Additionally there may be a subtype field if this model is a subtype.

HTMLBox¶

class HTMLBox(*args, **kwargs)[source]¶

A component which size is determined by its HTML content.

Note

This is an abstract base class used to help organize the hierarchy of Bokeh model types. It is not useful to instantiate on its own.

JSON Prototype

{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "css_classes": [],
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "18174",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    0,
    0,
    0,
    0
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "sizing_mode": null,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

Inherited from LayoutDOM

`disabled`	Whether the widget will be disabled when rendered.
`visible`	Whether the component will be visible and a part of a layout.
`width`	The width of the component (in pixels).
`height`	The height of the component (in pixels).
`min_width`	Minimal width of the component (in pixels) if width is adjustable.
`min_height`	Minimal height of the component (in pixels) if height is adjustable.
`max_width`	Maximal width of the component (in pixels) if width is adjustable.
`max_height`	Maximal height of the component (in pixels) if height is adjustable.
`margin`	Allows to create additional space around the component.
`width_policy`	Describes how the component should maintain its width.
`height_policy`	Describes how the component should maintain its height.
`aspect_ratio`	Describes the proportional relationship between component's width and height.
`sizing_mode`	How the component should size itself.
`align`	The alignment point within the parent container.
`background`	Background color of the component.
`css_classes`	A list of CSS class names to add to this DOM element.

Inherited from Model

`model_class_reverse_map`
`id`
`ref`
`struct`	A Bokeh protocol "structure" of this model, i.e. a dict of the form:.
`name`	An arbitrary, user-supplied name for this model.
`tags`	An optional list of arbitrary, user-supplied values to attach to this model.
`js_event_callbacks`	A mapping of event names to lists of `CustomJS` callbacks.
`subscribed_events`	List of events that are subscribed to by Python callbacks.
`js_property_callbacks`	A mapping of attribute names to lists of `CustomJS` callbacks, to be set up on BokehJS side when the document is created.
`syncable`	Indicates whether this model should be synchronized back to a Bokeh server when updated in a web browser.

Inherited from HasDocumentRef

The Document this model is attached to (can be None)

Public Methods:

Inherited from Model

`__init_subclass__`()
`__new__`(cls, args, *kwargs)
`__init__`(**kwargs)
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`destroy`()	Clean up references to the document and property
`js_on_event`(event, *callbacks)
`js_link`(attr, other, other_attr[, attr_selector])	Link two Bokeh model properties using JavaScript.
`js_on_change`(event, *callbacks)	Attach a `CustomJS` callback to an arbitrary BokehJS model event.
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`references`()	Returns all `Models` that this object has references to.
`select`(selector)	Query this object and all of its references for objects that match the given selector.
`select_one`(selector)	Query this object and all of its references for objects that match the given selector.
`set_select`(selector, updates)	Update objects that match a given selector with the specified attribute/value updates.
`to_json`(include_defaults)	Returns a dictionary of the attributes of this object, containing only "JSON types" (string, number, boolean, none, dict, list).
`to_json_string`(include_defaults)	Returns a JSON string encoding the attributes of this object.
`trigger`(attr, old, new[, hint, setter])

Inherited from HasProps

`__init__`(**kwargs)
`__setattr__`(name, value)	Intercept attribute setting on HasProps in order to special case a few situations:
`__getattr__`(name)	Intercept attribute setting on HasProps in order to special case a few situations:
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`equals`(other)	Structural equality of models.
`static_to_serializable`(serializer)
`to_serializable`(serializer)
`set_from_json`(name, json, *[, models, setter])	Set a property value on this object from JSON.
`update`(**kwargs)	Updates the object's properties from the given keyword arguments.
`update_from_json`(json_attributes, *[, ...])	Updates the object's properties from a JSON attributes dictionary.
`lookup`(name, *[, raises])	Find the `PropertyDescriptor` for a Bokeh property on a class, given the property name.
`properties`(*[, _with_props])	Collect the names of properties on this class.
`properties_with_refs`()	Collect the names of all properties on this class that also have references.
`dataspecs`()	Collect the names of all `DataSpec` properties on this class.
`properties_with_values`(*[, ...])	Collect a dict mapping property names to their values.
`query_properties_with_values`(query, *[, ...])	Query the properties values of `HasProps` instances with a predicate.
`themed_values`()	Get any theme-provided overrides.
`apply_theme`(property_values)	Apply a set of theme values which will be used rather than defaults, but will not override application-set values.
`unapply_theme`()	Remove any themed values and restore defaults.

Inherited from HasDocumentRef

__init__(**kwargs)

Inherited from PropertyCallbackManager

`__init__`(**kwargs)
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`remove_on_change`(attr, *callbacks)	Remove a callback from this object
`trigger`(attr, old, new[, hint, setter])

Inherited from EventCallbackManager

`__init__`(**kwargs)
`on_event`(event, *callbacks)	Run callbacks when the specified event occurs on this Model

align = 'start'¶

Type: Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

The alignment point within the parent container.

This property is useful only if this component is a child element of a layout (e.g. a grid). Self alignment can be overridden by the parent container (e.g. grid track align).

aspect_ratio = None¶

Type: Either(Null, Auto, Float)

Describes the proportional relationship between component’s width and height.

background = None¶

Type: Nullable(Color)

Background color of the component.

css_classes = []¶

Type: List

A list of CSS class names to add to this DOM element. Note: the class names are simply added as-is, no other guarantees are provided.

It is also permissible to assign from tuples, however these are adapted – the property will always contain a list.

disabled = False¶

Type: Bool

Whether the widget will be disabled when rendered.

If True, the widget will be greyed-out and not responsive to UI events.

height = None¶

Type: Nullable(NonNegativeInt)

The height of the component (in pixels).

This can be either fixed or preferred height, depending on height sizing policy.

height_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its height.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly height pixels. Component will overflow if it can’t fit in the available vertical space.
"fit": Use component’s preferred height (if set) and allow to fit into the available vertical space within the minimum and maximum height bounds (if set). Component’s height neither will be aggressively minimized nor maximized.
"min": Use as little vertical space as possible, not less than the minimum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much vertical space as possible, not more than the maximum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

margin = (0, 0, 0, 0)¶

Type: Nullable(Tuple(Int, Int, Int, Int))

max_height = None¶

Type: Nullable(NonNegativeInt)

Maximal height of the component (in pixels) if height is adjustable.

max_width = None¶

Type: Nullable(NonNegativeInt)

Maximal width of the component (in pixels) if width is adjustable.

min_height = None¶

Type: Nullable(NonNegativeInt)

Minimal height of the component (in pixels) if height is adjustable.

min_width = None¶

Type: Nullable(NonNegativeInt)

Minimal width of the component (in pixels) if width is adjustable.

name = None¶

Type: Nullable(String)

An arbitrary, user-supplied name for this model.

This name can be useful when querying the document to retrieve specific Bokeh models.

>>> plot.circle([1,2,3], [4,5,6], name="temp")
>>> plot.select(name="temp")
[GlyphRenderer(id='399d53f5-73e9-44d9-9527-544b761c7705', ...)]

Note

No uniqueness guarantees or other conditions are enforced on any names that are provided, nor is the name used directly by Bokeh for any reason.

sizing_mode = None¶

Type: Nullable(Enum(SizingMode))

How the component should size itself.

Possible scenarios:

"fixed": Component is not responsive. It will retain its original width and height regardless of any subsequent browser window resize events.
"stretch_width": Component will responsively resize to stretch to the available width, without maintaining any aspect ratio. The height of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_height": Component will responsively resize to stretch to the available height, without maintaining any aspect ratio. The width of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_both": Component is completely responsive, independently in width and height, and will occupy all the available horizontal and vertical space, even if this changes the aspect ratio of the component.
"scale_width": Component will responsively resize to stretch to the available width, while maintaining the original or provided aspect ratio.
"scale_height": Component will responsively resize to stretch to the available height, while maintaining the original or provided aspect ratio.
"scale_both": Component will responsively resize to both the available width and height, while maintaining the original or provided aspect ratio.

syncable = True¶

Type: Bool

Note

Setting this property to False will prevent any on_change() callbacks on this object from triggering. However, any JS-side callbacks will still work.

tags = []¶

Type: List

An optional list of arbitrary, user-supplied values to attach to this model.

This data can be useful when querying the document to retrieve specific Bokeh models:

>>> r = plot.circle([1,2,3], [4,5,6])
>>> r.tags = ["foo", 10]
>>> plot.select(tags=['foo', 10])
[GlyphRenderer(id='1de4c3df-a83d-480a-899b-fb263d3d5dd9', ...)]

Or simply a convenient way to attach any necessary metadata to a model that can be accessed by CustomJS callbacks, etc.

Note

No uniqueness guarantees or other conditions are enforced on any tags that are provided, nor are the tags used directly by Bokeh for any reason.

visible = True¶

Type: Bool

Whether the component will be visible and a part of a layout.

width = None¶

Type: Nullable(NonNegativeInt)

The width of the component (in pixels).

This can be either fixed or preferred width, depending on width sizing policy.

width_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its width.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly width pixels. Component will overflow if it can’t fit in the available horizontal space.
"fit": Use component’s preferred width (if set) and allow it to fit into the available horizontal space within the minimum and maximum width bounds (if set). Component’s width neither will be aggressively minimized nor maximized.
"min": Use as little horizontal space as possible, not less than the minimum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much horizontal space as possible, not more than the maximum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

apply_theme(property_values: Dict[str, Any]) → None¶

Apply a set of theme values which will be used rather than defaults, but will not override application-set values.

The passed-in dictionary may be kept around as-is and shared with other instances to save memory (so neither the caller nor the HasProps instance should modify it).

Parameters: property_values (dict) – theme values to use in place of defaults
Returns: None

classmethod dataspecs() → Dict[str, DataSpec]¶

Collect the names of all DataSpec properties on this class.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of DataSpec properties
Return type: set[str]

destroy() → None¶: Clean up references to the document and property

equals(other: bokeh.core.has_props.HasProps) → bool¶

Structural equality of models.

Parameters: other (HasProps) – the other instance to compare to
Returns: True, if properties are structurally equal, otherwise False

js_link(attr: str, other: Model, other_attr: str, attr_selector: int | str | None = None) → None¶

Link two Bokeh model properties using JavaScript.

This is a convenience method that simplifies adding a CustomJS callback to update one Bokeh model property whenever another changes value.

Parameters

attr (str) – The name of a Bokeh property on this model
other (Model) – A Bokeh model to link to self.attr
other_attr (str) – The property on other to link together
attr_selector (Union[int, str]) – The index to link an item in a subscriptable attr

Added in version 1.1

Raises: ValueError –

Examples

This code with js_link:

select.js_link('value', plot, 'sizing_mode')

is equivalent to the following:

from bokeh.models import CustomJS
select.js_on_change('value',
    CustomJS(args=dict(other=plot),
             code="other.sizing_mode = this.value"
    )
)

Additionally, to use attr_selector to attach the left side of a range slider to a plot’s x_range:

range_slider.js_link('value', plot.x_range, 'start', attr_selector=0)

which is equivalent to:

from bokeh.models import CustomJS
range_slider.js_on_change('value',
    CustomJS(args=dict(other=plot.x_range),
             code="other.start = this.value[0]"
    )
)

js_on_change(event: str, *callbacks: JSEventCallback) → None¶

Attach a CustomJS callback to an arbitrary BokehJS model event.

# these two are equivalent
source.js_on_change('data', callback)
source.js_on_change('change:data', callback)

source.js_on_change('streaming', callback)

classmethod lookup(name: str, *, raises: bool = True) → PropertyDescriptor[Any] | None¶

Find the PropertyDescriptor for a Bokeh property on a class, given the property name.

Parameters

name (str) – name of the property to search for
raises (bool) – whether to raise or return None if missing

Returns

descriptor for property named name

Return type

on_change(attr: str, *callbacks: PropertyCallback) → None¶

Add a callback on this object to trigger when attr changes.

Parameters

attr (str) – an attribute name on this object
*callbacks (callable) – callback functions to register

Returns

None

Example:

widget.on_change('value', callback1, callback2, ..., callback_n)

on_event(event: str | Type[Event], *callbacks: EventCallback) → None¶

Run callbacks when the specified event occurs on this Model

Not all Events are supported for all Models. See specific Events in bokeh.events for more information on which Models are able to trigger them.

classmethod properties(*, _with_props: bool = False) → Union[Set[str], Dict[str, Property[Any]]]¶

Collect the names of properties on this class.

Warning

In a future version of Bokeh, this method will return a dictionary mapping property names to property objects. To future-proof this current usage of this method, wrap the return value in list.

Returns: property names

classmethod properties_with_refs() → Dict[str, Property[Any]]¶

Collect the names of all properties on this class that also have references.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of properties that have references
Return type: set[str]

properties_with_values(*, include_defaults: bool = True, include_undefined: bool = False) → Dict[str, Any]¶

Collect a dict mapping property names to their values.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Parameters: include_defaults (bool, optional) – Whether to include properties that haven’t been explicitly set since the object was created. (default: True)
Returns: mapping from property names to their values
Return type: dict

Query the properties values of HasProps instances with a predicate.

Parameters

query (callable) – A callable that accepts property descriptors and returns True or False
include_defaults (bool, optional) – Whether to include properties that have not been explicitly set by a user (default: True)

Returns

mapping of property names and values for matching properties

Return type

references() → Set[bokeh.model.model.Model]¶: Returns all Models that this object has references to.

remove_on_change(attr: str, *callbacks: Callable[[str, Any, Any], None]) → None¶: Remove a callback from this object

select(selector: SelectorType) → Iterable[Model]¶

Query this object and all of its references for objects that match the given selector.

Parameters: selector (JSON-like) –
Returns: seq[Model]

select_one(selector: SelectorType) → Model | None¶

Returns: Model

set_from_json(name: str, json: JSON, *, models: Dict[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Set a property value on this object from JSON.

Parameters

name – (str) : name of the attribute to set
json – (JSON-value) : value to set to the attribute to
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

set_select(selector: Type[Model] | SelectorType, updates: Dict[str, Unknown]) → None¶

Update objects that match a given selector with the specified attribute/value updates.

Parameters

selector (JSON-like) –
updates (dict) –

Returns

None

themed_values() → Dict[str, Unknown] | None¶

Get any theme-provided overrides.

Results are returned as a dict from property name to value, or None if no theme overrides any values for this instance.

Returns: dict or None

to_json(include_defaults: bool) → JSON¶

Returns a dictionary of the attributes of this object, containing only “JSON types” (string, number, boolean, none, dict, list).

References to other objects are serialized as “refs” (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

to_json_string(include_defaults: bool) → str¶

Returns a JSON string encoding the attributes of this object.

References to other objects are serialized as references (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json_string() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

trigger(attr: str, old: Unknown, new: Unknown, hint: DocumentPatchedEvent | None = None, setter: Setter | None = None) → None¶

unapply_theme() → None¶

Remove any themed values and restore defaults.

Returns: None

update(**kwargs: Any) → None¶

Updates the object’s properties from the given keyword arguments.

Returns: None

Examples

The following are equivalent:

from bokeh.models import Range1d

r = Range1d

# set properties individually:
r.start = 10
r.end = 20

# update properties together:
r.update(start=10, end=20)

update_from_json(json_attributes: Dict[str, JSON], *, models: Mapping[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Updates the object’s properties from a JSON attributes dictionary.

Parameters

json_attributes – (JSON-dict) : attributes and values to update
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

property document: Document | None¶: The Document this model is attached to (can be None)

property struct: bokeh.core.types.ReferenceJson¶

A Bokeh protocol “structure” of this model, i.e. a dict of the form:

{
    'type' : << view model name >>
    'id'   : << unique model id >>
}

Additionally there may be a subtype field if this model is a subtype.

LayoutDOM¶

class LayoutDOM(*args, **kwargs)[source]¶

Bases: bokeh.model.model.Model

The base class for layoutable components.

Note

This is an abstract base class used to help organize the hierarchy of Bokeh model types. It is not useful to instantiate on its own.

JSON Prototype

{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "css_classes": [],
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "18194",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    0,
    0,
    0,
    0
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "sizing_mode": null,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

`disabled`	Whether the widget will be disabled when rendered.
`visible`	Whether the component will be visible and a part of a layout.
`width`	The width of the component (in pixels).
`height`	The height of the component (in pixels).
`min_width`	Minimal width of the component (in pixels) if width is adjustable.
`min_height`	Minimal height of the component (in pixels) if height is adjustable.
`max_width`	Maximal width of the component (in pixels) if width is adjustable.
`max_height`	Maximal height of the component (in pixels) if height is adjustable.
`margin`	Allows to create additional space around the component.
`width_policy`	Describes how the component should maintain its width.
`height_policy`	Describes how the component should maintain its height.
`aspect_ratio`	Describes the proportional relationship between component's width and height.
`sizing_mode`	How the component should size itself.
`align`	The alignment point within the parent container.
`background`	Background color of the component.
`css_classes`	A list of CSS class names to add to this DOM element.

Inherited from Model

`model_class_reverse_map`
`id`
`ref`
`struct`	A Bokeh protocol "structure" of this model, i.e. a dict of the form:.
`name`	An arbitrary, user-supplied name for this model.
`tags`	An optional list of arbitrary, user-supplied values to attach to this model.
`js_event_callbacks`	A mapping of event names to lists of `CustomJS` callbacks.
`subscribed_events`	List of events that are subscribed to by Python callbacks.
`js_property_callbacks`	A mapping of attribute names to lists of `CustomJS` callbacks, to be set up on BokehJS side when the document is created.
`syncable`	Indicates whether this model should be synchronized back to a Bokeh server when updated in a web browser.

Inherited from HasDocumentRef

The Document this model is attached to (can be None)

Public Methods:

Inherited from Model

`__init_subclass__`()
`__new__`(cls, args, *kwargs)
`__init__`(**kwargs)
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`destroy`()	Clean up references to the document and property
`js_on_event`(event, *callbacks)
`js_link`(attr, other, other_attr[, attr_selector])	Link two Bokeh model properties using JavaScript.
`js_on_change`(event, *callbacks)	Attach a `CustomJS` callback to an arbitrary BokehJS model event.
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`references`()	Returns all `Models` that this object has references to.
`select`(selector)	Query this object and all of its references for objects that match the given selector.
`select_one`(selector)	Query this object and all of its references for objects that match the given selector.
`set_select`(selector, updates)	Update objects that match a given selector with the specified attribute/value updates.
`to_json`(include_defaults)	Returns a dictionary of the attributes of this object, containing only "JSON types" (string, number, boolean, none, dict, list).
`to_json_string`(include_defaults)	Returns a JSON string encoding the attributes of this object.
`trigger`(attr, old, new[, hint, setter])

Inherited from HasProps

`__init__`(**kwargs)
`__setattr__`(name, value)	Intercept attribute setting on HasProps in order to special case a few situations:
`__getattr__`(name)	Intercept attribute setting on HasProps in order to special case a few situations:
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`equals`(other)	Structural equality of models.
`static_to_serializable`(serializer)
`to_serializable`(serializer)
`set_from_json`(name, json, *[, models, setter])	Set a property value on this object from JSON.
`update`(**kwargs)	Updates the object's properties from the given keyword arguments.
`update_from_json`(json_attributes, *[, ...])	Updates the object's properties from a JSON attributes dictionary.
`lookup`(name, *[, raises])	Find the `PropertyDescriptor` for a Bokeh property on a class, given the property name.
`properties`(*[, _with_props])	Collect the names of properties on this class.
`properties_with_refs`()	Collect the names of all properties on this class that also have references.
`dataspecs`()	Collect the names of all `DataSpec` properties on this class.
`properties_with_values`(*[, ...])	Collect a dict mapping property names to their values.
`query_properties_with_values`(query, *[, ...])	Query the properties values of `HasProps` instances with a predicate.
`themed_values`()	Get any theme-provided overrides.
`apply_theme`(property_values)	Apply a set of theme values which will be used rather than defaults, but will not override application-set values.
`unapply_theme`()	Remove any themed values and restore defaults.

Inherited from HasDocumentRef

__init__(**kwargs)

Inherited from PropertyCallbackManager

`__init__`(**kwargs)
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`remove_on_change`(attr, *callbacks)	Remove a callback from this object
`trigger`(attr, old, new[, hint, setter])

Inherited from EventCallbackManager

`__init__`(**kwargs)
`on_event`(event, *callbacks)	Run callbacks when the specified event occurs on this Model

align = 'start'¶

Type: Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

The alignment point within the parent container.

This property is useful only if this component is a child element of a layout (e.g. a grid). Self alignment can be overridden by the parent container (e.g. grid track align).

aspect_ratio = None¶

Type: Either(Null, Auto, Float)

Describes the proportional relationship between component’s width and height.

background = None¶

Type: Nullable(Color)

Background color of the component.

css_classes = []¶

Type: List

A list of CSS class names to add to this DOM element. Note: the class names are simply added as-is, no other guarantees are provided.

It is also permissible to assign from tuples, however these are adapted – the property will always contain a list.

disabled = False¶

Type: Bool

Whether the widget will be disabled when rendered.

If True, the widget will be greyed-out and not responsive to UI events.

height = None¶

Type: Nullable(NonNegativeInt)

The height of the component (in pixels).

This can be either fixed or preferred height, depending on height sizing policy.

height_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its height.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly height pixels. Component will overflow if it can’t fit in the available vertical space.
"fit": Use component’s preferred height (if set) and allow to fit into the available vertical space within the minimum and maximum height bounds (if set). Component’s height neither will be aggressively minimized nor maximized.
"min": Use as little vertical space as possible, not less than the minimum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much vertical space as possible, not more than the maximum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

margin = (0, 0, 0, 0)¶

Type: Nullable(Tuple(Int, Int, Int, Int))

max_height = None¶

Type: Nullable(NonNegativeInt)

Maximal height of the component (in pixels) if height is adjustable.

max_width = None¶

Type: Nullable(NonNegativeInt)

Maximal width of the component (in pixels) if width is adjustable.

min_height = None¶

Type: Nullable(NonNegativeInt)

Minimal height of the component (in pixels) if height is adjustable.

min_width = None¶

Type: Nullable(NonNegativeInt)

Minimal width of the component (in pixels) if width is adjustable.

name = None¶

Type: Nullable(String)

An arbitrary, user-supplied name for this model.

This name can be useful when querying the document to retrieve specific Bokeh models.

>>> plot.circle([1,2,3], [4,5,6], name="temp")
>>> plot.select(name="temp")
[GlyphRenderer(id='399d53f5-73e9-44d9-9527-544b761c7705', ...)]

Note

No uniqueness guarantees or other conditions are enforced on any names that are provided, nor is the name used directly by Bokeh for any reason.

sizing_mode = None¶

Type: Nullable(Enum(SizingMode))

How the component should size itself.

Possible scenarios:

"fixed": Component is not responsive. It will retain its original width and height regardless of any subsequent browser window resize events.
"stretch_width": Component will responsively resize to stretch to the available width, without maintaining any aspect ratio. The height of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_height": Component will responsively resize to stretch to the available height, without maintaining any aspect ratio. The width of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_both": Component is completely responsive, independently in width and height, and will occupy all the available horizontal and vertical space, even if this changes the aspect ratio of the component.
"scale_width": Component will responsively resize to stretch to the available width, while maintaining the original or provided aspect ratio.
"scale_height": Component will responsively resize to stretch to the available height, while maintaining the original or provided aspect ratio.
"scale_both": Component will responsively resize to both the available width and height, while maintaining the original or provided aspect ratio.

syncable = True¶

Type: Bool

Note

Setting this property to False will prevent any on_change() callbacks on this object from triggering. However, any JS-side callbacks will still work.

tags = []¶

Type: List

An optional list of arbitrary, user-supplied values to attach to this model.

This data can be useful when querying the document to retrieve specific Bokeh models:

>>> r = plot.circle([1,2,3], [4,5,6])
>>> r.tags = ["foo", 10]
>>> plot.select(tags=['foo', 10])
[GlyphRenderer(id='1de4c3df-a83d-480a-899b-fb263d3d5dd9', ...)]

Or simply a convenient way to attach any necessary metadata to a model that can be accessed by CustomJS callbacks, etc.

Note

No uniqueness guarantees or other conditions are enforced on any tags that are provided, nor are the tags used directly by Bokeh for any reason.

visible = True¶

Type: Bool

Whether the component will be visible and a part of a layout.

width = None¶

Type: Nullable(NonNegativeInt)

The width of the component (in pixels).

This can be either fixed or preferred width, depending on width sizing policy.

width_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its width.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly width pixels. Component will overflow if it can’t fit in the available horizontal space.
"fit": Use component’s preferred width (if set) and allow it to fit into the available horizontal space within the minimum and maximum width bounds (if set). Component’s width neither will be aggressively minimized nor maximized.
"min": Use as little horizontal space as possible, not less than the minimum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much horizontal space as possible, not more than the maximum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

apply_theme(property_values: Dict[str, Any]) → None¶

Apply a set of theme values which will be used rather than defaults, but will not override application-set values.

The passed-in dictionary may be kept around as-is and shared with other instances to save memory (so neither the caller nor the HasProps instance should modify it).

Parameters: property_values (dict) – theme values to use in place of defaults
Returns: None

classmethod dataspecs() → Dict[str, DataSpec]¶

Collect the names of all DataSpec properties on this class.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of DataSpec properties
Return type: set[str]

destroy() → None¶: Clean up references to the document and property

equals(other: bokeh.core.has_props.HasProps) → bool¶

Structural equality of models.

Parameters: other (HasProps) – the other instance to compare to
Returns: True, if properties are structurally equal, otherwise False

js_link(attr: str, other: Model, other_attr: str, attr_selector: int | str | None = None) → None¶

Link two Bokeh model properties using JavaScript.

This is a convenience method that simplifies adding a CustomJS callback to update one Bokeh model property whenever another changes value.

Parameters

attr (str) – The name of a Bokeh property on this model
other (Model) – A Bokeh model to link to self.attr
other_attr (str) – The property on other to link together
attr_selector (Union[int, str]) – The index to link an item in a subscriptable attr

Added in version 1.1

Raises: ValueError –

Examples

This code with js_link:

select.js_link('value', plot, 'sizing_mode')

is equivalent to the following:

from bokeh.models import CustomJS
select.js_on_change('value',
    CustomJS(args=dict(other=plot),
             code="other.sizing_mode = this.value"
    )
)

Additionally, to use attr_selector to attach the left side of a range slider to a plot’s x_range:

range_slider.js_link('value', plot.x_range, 'start', attr_selector=0)

which is equivalent to:

from bokeh.models import CustomJS
range_slider.js_on_change('value',
    CustomJS(args=dict(other=plot.x_range),
             code="other.start = this.value[0]"
    )
)

js_on_change(event: str, *callbacks: JSEventCallback) → None¶

Attach a CustomJS callback to an arbitrary BokehJS model event.

# these two are equivalent
source.js_on_change('data', callback)
source.js_on_change('change:data', callback)

source.js_on_change('streaming', callback)

classmethod lookup(name: str, *, raises: bool = True) → PropertyDescriptor[Any] | None¶

Find the PropertyDescriptor for a Bokeh property on a class, given the property name.

Parameters

name (str) – name of the property to search for
raises (bool) – whether to raise or return None if missing

Returns

descriptor for property named name

Return type

on_change(attr: str, *callbacks: PropertyCallback) → None¶

Add a callback on this object to trigger when attr changes.

Parameters

attr (str) – an attribute name on this object
*callbacks (callable) – callback functions to register

Returns

None

Example:

widget.on_change('value', callback1, callback2, ..., callback_n)

on_event(event: str | Type[Event], *callbacks: EventCallback) → None¶

Run callbacks when the specified event occurs on this Model

Not all Events are supported for all Models. See specific Events in bokeh.events for more information on which Models are able to trigger them.

classmethod properties(*, _with_props: bool = False) → Union[Set[str], Dict[str, Property[Any]]]¶

Collect the names of properties on this class.

Warning

In a future version of Bokeh, this method will return a dictionary mapping property names to property objects. To future-proof this current usage of this method, wrap the return value in list.

Returns: property names

classmethod properties_with_refs() → Dict[str, Property[Any]]¶

Collect the names of all properties on this class that also have references.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of properties that have references
Return type: set[str]

properties_with_values(*, include_defaults: bool = True, include_undefined: bool = False) → Dict[str, Any]¶

Collect a dict mapping property names to their values.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Parameters: include_defaults (bool, optional) – Whether to include properties that haven’t been explicitly set since the object was created. (default: True)
Returns: mapping from property names to their values
Return type: dict

Query the properties values of HasProps instances with a predicate.

Parameters

query (callable) – A callable that accepts property descriptors and returns True or False
include_defaults (bool, optional) – Whether to include properties that have not been explicitly set by a user (default: True)

Returns

mapping of property names and values for matching properties

Return type

references() → Set[bokeh.model.model.Model]¶: Returns all Models that this object has references to.

remove_on_change(attr: str, *callbacks: Callable[[str, Any, Any], None]) → None¶: Remove a callback from this object

select(selector: SelectorType) → Iterable[Model]¶

Query this object and all of its references for objects that match the given selector.

Parameters: selector (JSON-like) –
Returns: seq[Model]

select_one(selector: SelectorType) → Model | None¶

Returns: Model

set_from_json(name: str, json: JSON, *, models: Dict[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Set a property value on this object from JSON.

Parameters

name – (str) : name of the attribute to set
json – (JSON-value) : value to set to the attribute to
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

set_select(selector: Type[Model] | SelectorType, updates: Dict[str, Unknown]) → None¶

Update objects that match a given selector with the specified attribute/value updates.

Parameters

selector (JSON-like) –
updates (dict) –

Returns

None

themed_values() → Dict[str, Unknown] | None¶

Get any theme-provided overrides.

Results are returned as a dict from property name to value, or None if no theme overrides any values for this instance.

Returns: dict or None

to_json(include_defaults: bool) → JSON¶

Returns a dictionary of the attributes of this object, containing only “JSON types” (string, number, boolean, none, dict, list).

References to other objects are serialized as “refs” (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

to_json_string(include_defaults: bool) → str¶

Returns a JSON string encoding the attributes of this object.

References to other objects are serialized as references (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json_string() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

trigger(attr: str, old: Unknown, new: Unknown, hint: DocumentPatchedEvent | None = None, setter: Setter | None = None) → None¶

unapply_theme() → None¶

Remove any themed values and restore defaults.

Returns: None

update(**kwargs: Any) → None¶

Updates the object’s properties from the given keyword arguments.

Returns: None

Examples

The following are equivalent:

from bokeh.models import Range1d

r = Range1d

# set properties individually:
r.start = 10
r.end = 20

# update properties together:
r.update(start=10, end=20)

update_from_json(json_attributes: Dict[str, JSON], *, models: Mapping[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Updates the object’s properties from a JSON attributes dictionary.

Parameters

json_attributes – (JSON-dict) : attributes and values to update
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

property document: Document | None¶: The Document this model is attached to (can be None)

property struct: bokeh.core.types.ReferenceJson¶

A Bokeh protocol “structure” of this model, i.e. a dict of the form:

{
    'type' : << view model name >>
    'id'   : << unique model id >>
}

Additionally there may be a subtype field if this model is a subtype.

Panel¶

class Panel(*args, **kwargs)[source]¶

Bases: bokeh.model.model.Model

A single-widget container with title bar and controls.

JSON Prototype

{
  "closable": false,
  "disabled": false,
  "id": "18214",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "name": null,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "title": ""
}

Public Data Attributes:

`title`	The text title of the panel.
`child`	The child widget.
`closable`	Whether this panel is closable or not.
`disabled`	Whether the widget is responsive to UI events.

Inherited from Model

`model_class_reverse_map`
`id`
`ref`
`struct`	A Bokeh protocol "structure" of this model, i.e. a dict of the form:.
`name`	An arbitrary, user-supplied name for this model.
`tags`	An optional list of arbitrary, user-supplied values to attach to this model.
`js_event_callbacks`	A mapping of event names to lists of `CustomJS` callbacks.
`subscribed_events`	List of events that are subscribed to by Python callbacks.
`js_property_callbacks`	A mapping of attribute names to lists of `CustomJS` callbacks, to be set up on BokehJS side when the document is created.
`syncable`	Indicates whether this model should be synchronized back to a Bokeh server when updated in a web browser.

Inherited from HasDocumentRef

The Document this model is attached to (can be None)

Public Methods:

Inherited from Model

`__init_subclass__`()
`__new__`(cls, args, *kwargs)
`__init__`(**kwargs)
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`destroy`()	Clean up references to the document and property
`js_on_event`(event, *callbacks)
`js_link`(attr, other, other_attr[, attr_selector])	Link two Bokeh model properties using JavaScript.
`js_on_change`(event, *callbacks)	Attach a `CustomJS` callback to an arbitrary BokehJS model event.
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`references`()	Returns all `Models` that this object has references to.
`select`(selector)	Query this object and all of its references for objects that match the given selector.
`select_one`(selector)	Query this object and all of its references for objects that match the given selector.
`set_select`(selector, updates)	Update objects that match a given selector with the specified attribute/value updates.
`to_json`(include_defaults)	Returns a dictionary of the attributes of this object, containing only "JSON types" (string, number, boolean, none, dict, list).
`to_json_string`(include_defaults)	Returns a JSON string encoding the attributes of this object.
`trigger`(attr, old, new[, hint, setter])

Inherited from HasProps

`__init__`(**kwargs)
`__setattr__`(name, value)	Intercept attribute setting on HasProps in order to special case a few situations:
`__getattr__`(name)	Intercept attribute setting on HasProps in order to special case a few situations:
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`equals`(other)	Structural equality of models.
`static_to_serializable`(serializer)
`to_serializable`(serializer)
`set_from_json`(name, json, *[, models, setter])	Set a property value on this object from JSON.
`update`(**kwargs)	Updates the object's properties from the given keyword arguments.
`update_from_json`(json_attributes, *[, ...])	Updates the object's properties from a JSON attributes dictionary.
`lookup`(name, *[, raises])	Find the `PropertyDescriptor` for a Bokeh property on a class, given the property name.
`properties`(*[, _with_props])	Collect the names of properties on this class.
`properties_with_refs`()	Collect the names of all properties on this class that also have references.
`dataspecs`()	Collect the names of all `DataSpec` properties on this class.
`properties_with_values`(*[, ...])	Collect a dict mapping property names to their values.
`query_properties_with_values`(query, *[, ...])	Query the properties values of `HasProps` instances with a predicate.
`themed_values`()	Get any theme-provided overrides.
`apply_theme`(property_values)	Apply a set of theme values which will be used rather than defaults, but will not override application-set values.
`unapply_theme`()	Remove any themed values and restore defaults.

Inherited from HasDocumentRef

__init__(**kwargs)

Inherited from PropertyCallbackManager

`__init__`(**kwargs)
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`remove_on_change`(attr, *callbacks)	Remove a callback from this object
`trigger`(attr, old, new[, hint, setter])

Inherited from EventCallbackManager

`__init__`(**kwargs)
`on_event`(event, *callbacks)	Run callbacks when the specified event occurs on this Model

child = Undefined¶

Type: Instance(LayoutDOM)

The child widget. If you need more children, use a layout widget, e.g. a Column.

closable = False¶

Type: Bool

Whether this panel is closable or not. If True, an “x” button will appear.

Closing a panel is equivalent to removing it from its parent container (e.g. tabs).

disabled = False¶

Type: Bool

Whether the widget is responsive to UI events.

name = None¶

Type: Nullable(String)

An arbitrary, user-supplied name for this model.

This name can be useful when querying the document to retrieve specific Bokeh models.

>>> plot.circle([1,2,3], [4,5,6], name="temp")
>>> plot.select(name="temp")
[GlyphRenderer(id='399d53f5-73e9-44d9-9527-544b761c7705', ...)]

Note

No uniqueness guarantees or other conditions are enforced on any names that are provided, nor is the name used directly by Bokeh for any reason.

syncable = True¶

Type: Bool

Note

Setting this property to False will prevent any on_change() callbacks on this object from triggering. However, any JS-side callbacks will still work.

tags = []¶

Type: List

An optional list of arbitrary, user-supplied values to attach to this model.

This data can be useful when querying the document to retrieve specific Bokeh models:

>>> r = plot.circle([1,2,3], [4,5,6])
>>> r.tags = ["foo", 10]
>>> plot.select(tags=['foo', 10])
[GlyphRenderer(id='1de4c3df-a83d-480a-899b-fb263d3d5dd9', ...)]

Or simply a convenient way to attach any necessary metadata to a model that can be accessed by CustomJS callbacks, etc.

Note

No uniqueness guarantees or other conditions are enforced on any tags that are provided, nor are the tags used directly by Bokeh for any reason.

title = ''¶

Type: String

The text title of the panel.

apply_theme(property_values: Dict[str, Any]) → None¶

Apply a set of theme values which will be used rather than defaults, but will not override application-set values.

The passed-in dictionary may be kept around as-is and shared with other instances to save memory (so neither the caller nor the HasProps instance should modify it).

Parameters: property_values (dict) – theme values to use in place of defaults
Returns: None

classmethod dataspecs() → Dict[str, DataSpec]¶

Collect the names of all DataSpec properties on this class.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of DataSpec properties
Return type: set[str]

destroy() → None¶: Clean up references to the document and property

equals(other: bokeh.core.has_props.HasProps) → bool¶

Structural equality of models.

Parameters: other (HasProps) – the other instance to compare to
Returns: True, if properties are structurally equal, otherwise False

js_link(attr: str, other: Model, other_attr: str, attr_selector: int | str | None = None) → None¶

Link two Bokeh model properties using JavaScript.

This is a convenience method that simplifies adding a CustomJS callback to update one Bokeh model property whenever another changes value.

Parameters

attr (str) – The name of a Bokeh property on this model
other (Model) – A Bokeh model to link to self.attr
other_attr (str) – The property on other to link together
attr_selector (Union[int, str]) – The index to link an item in a subscriptable attr

Added in version 1.1

Raises: ValueError –

Examples

This code with js_link:

select.js_link('value', plot, 'sizing_mode')

is equivalent to the following:

from bokeh.models import CustomJS
select.js_on_change('value',
    CustomJS(args=dict(other=plot),
             code="other.sizing_mode = this.value"
    )
)

Additionally, to use attr_selector to attach the left side of a range slider to a plot’s x_range:

range_slider.js_link('value', plot.x_range, 'start', attr_selector=0)

which is equivalent to:

from bokeh.models import CustomJS
range_slider.js_on_change('value',
    CustomJS(args=dict(other=plot.x_range),
             code="other.start = this.value[0]"
    )
)

js_on_change(event: str, *callbacks: JSEventCallback) → None¶

Attach a CustomJS callback to an arbitrary BokehJS model event.

# these two are equivalent
source.js_on_change('data', callback)
source.js_on_change('change:data', callback)

source.js_on_change('streaming', callback)

classmethod lookup(name: str, *, raises: bool = True) → PropertyDescriptor[Any] | None¶

Find the PropertyDescriptor for a Bokeh property on a class, given the property name.

Parameters

name (str) – name of the property to search for
raises (bool) – whether to raise or return None if missing

Returns

descriptor for property named name

Return type

on_change(attr: str, *callbacks: PropertyCallback) → None¶

Add a callback on this object to trigger when attr changes.

Parameters

attr (str) – an attribute name on this object
*callbacks (callable) – callback functions to register

Returns

None

Example:

widget.on_change('value', callback1, callback2, ..., callback_n)

on_event(event: str | Type[Event], *callbacks: EventCallback) → None¶

Run callbacks when the specified event occurs on this Model

Not all Events are supported for all Models. See specific Events in bokeh.events for more information on which Models are able to trigger them.

classmethod properties(*, _with_props: bool = False) → Union[Set[str], Dict[str, Property[Any]]]¶

Collect the names of properties on this class.

Warning

In a future version of Bokeh, this method will return a dictionary mapping property names to property objects. To future-proof this current usage of this method, wrap the return value in list.

Returns: property names

classmethod properties_with_refs() → Dict[str, Property[Any]]¶

Collect the names of all properties on this class that also have references.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of properties that have references
Return type: set[str]

properties_with_values(*, include_defaults: bool = True, include_undefined: bool = False) → Dict[str, Any]¶

Collect a dict mapping property names to their values.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Parameters: include_defaults (bool, optional) – Whether to include properties that haven’t been explicitly set since the object was created. (default: True)
Returns: mapping from property names to their values
Return type: dict

Query the properties values of HasProps instances with a predicate.

Parameters

query (callable) – A callable that accepts property descriptors and returns True or False
include_defaults (bool, optional) – Whether to include properties that have not been explicitly set by a user (default: True)

Returns

mapping of property names and values for matching properties

Return type

references() → Set[bokeh.model.model.Model]¶: Returns all Models that this object has references to.

remove_on_change(attr: str, *callbacks: Callable[[str, Any, Any], None]) → None¶: Remove a callback from this object

select(selector: SelectorType) → Iterable[Model]¶

Query this object and all of its references for objects that match the given selector.

Parameters: selector (JSON-like) –
Returns: seq[Model]

select_one(selector: SelectorType) → Model | None¶

Returns: Model

set_from_json(name: str, json: JSON, *, models: Dict[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Set a property value on this object from JSON.

Parameters

name – (str) : name of the attribute to set
json – (JSON-value) : value to set to the attribute to
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

set_select(selector: Type[Model] | SelectorType, updates: Dict[str, Unknown]) → None¶

Update objects that match a given selector with the specified attribute/value updates.

Parameters

selector (JSON-like) –
updates (dict) –

Returns

None

themed_values() → Dict[str, Unknown] | None¶

Get any theme-provided overrides.

Results are returned as a dict from property name to value, or None if no theme overrides any values for this instance.

Returns: dict or None

to_json(include_defaults: bool) → JSON¶

Returns a dictionary of the attributes of this object, containing only “JSON types” (string, number, boolean, none, dict, list).

References to other objects are serialized as “refs” (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

to_json_string(include_defaults: bool) → str¶

Returns a JSON string encoding the attributes of this object.

References to other objects are serialized as references (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json_string() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

trigger(attr: str, old: Unknown, new: Unknown, hint: DocumentPatchedEvent | None = None, setter: Setter | None = None) → None¶

unapply_theme() → None¶

Remove any themed values and restore defaults.

Returns: None

update(**kwargs: Any) → None¶

Updates the object’s properties from the given keyword arguments.

Returns: None

Examples

The following are equivalent:

from bokeh.models import Range1d

r = Range1d

# set properties individually:
r.start = 10
r.end = 20

# update properties together:
r.update(start=10, end=20)

update_from_json(json_attributes: Dict[str, JSON], *, models: Mapping[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Updates the object’s properties from a JSON attributes dictionary.

Parameters

json_attributes – (JSON-dict) : attributes and values to update
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

property document: Document | None¶: The Document this model is attached to (can be None)

property struct: bokeh.core.types.ReferenceJson¶

A Bokeh protocol “structure” of this model, i.e. a dict of the form:

{
    'type' : << view model name >>
    'id'   : << unique model id >>
}

Additionally there may be a subtype field if this model is a subtype.

Row¶

class Row(*args, **kwargs)[source]¶

Bases: bokeh.models.layouts.Box

Lay out child components in a single horizontal row.

Children can be specified as positional arguments, as a single argument that is a sequence, or using the children keyword argument.

JSON Prototype

{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "children": [],
  "cols": "auto",
  "css_classes": [],
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "18222",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    0,
    0,
    0,
    0
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "sizing_mode": null,
  "spacing": 0,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

cols

Describes how the component should maintain its columns' widths.

Inherited from Box

`children`	The list of children, which can be other components including plots, rows, columns, and widgets.
`spacing`	The gap between children (in pixels).

Inherited from LayoutDOM

`disabled`	Whether the widget will be disabled when rendered.
`visible`	Whether the component will be visible and a part of a layout.
`width`	The width of the component (in pixels).
`height`	The height of the component (in pixels).
`min_width`	Minimal width of the component (in pixels) if width is adjustable.
`min_height`	Minimal height of the component (in pixels) if height is adjustable.
`max_width`	Maximal width of the component (in pixels) if width is adjustable.
`max_height`	Maximal height of the component (in pixels) if height is adjustable.
`margin`	Allows to create additional space around the component.
`width_policy`	Describes how the component should maintain its width.
`height_policy`	Describes how the component should maintain its height.
`aspect_ratio`	Describes the proportional relationship between component's width and height.
`sizing_mode`	How the component should size itself.
`align`	The alignment point within the parent container.
`background`	Background color of the component.
`css_classes`	A list of CSS class names to add to this DOM element.

Inherited from Model

`model_class_reverse_map`
`id`
`ref`
`struct`	A Bokeh protocol "structure" of this model, i.e. a dict of the form:.
`name`	An arbitrary, user-supplied name for this model.
`tags`	An optional list of arbitrary, user-supplied values to attach to this model.
`js_event_callbacks`	A mapping of event names to lists of `CustomJS` callbacks.
`subscribed_events`	List of events that are subscribed to by Python callbacks.
`js_property_callbacks`	A mapping of attribute names to lists of `CustomJS` callbacks, to be set up on BokehJS side when the document is created.
`syncable`	Indicates whether this model should be synchronized back to a Bokeh server when updated in a web browser.

Inherited from HasDocumentRef

The Document this model is attached to (can be None)

Public Methods:

Inherited from Box

__init__(*args, **kwargs)

Inherited from Model

`__init_subclass__`()
`__new__`(cls, args, *kwargs)
`__init__`(args, *kwargs)
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`destroy`()	Clean up references to the document and property
`js_on_event`(event, *callbacks)
`js_link`(attr, other, other_attr[, attr_selector])	Link two Bokeh model properties using JavaScript.
`js_on_change`(event, *callbacks)	Attach a `CustomJS` callback to an arbitrary BokehJS model event.
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`references`()	Returns all `Models` that this object has references to.
`select`(selector)	Query this object and all of its references for objects that match the given selector.
`select_one`(selector)	Query this object and all of its references for objects that match the given selector.
`set_select`(selector, updates)	Update objects that match a given selector with the specified attribute/value updates.
`to_json`(include_defaults)	Returns a dictionary of the attributes of this object, containing only "JSON types" (string, number, boolean, none, dict, list).
`to_json_string`(include_defaults)	Returns a JSON string encoding the attributes of this object.
`trigger`(attr, old, new[, hint, setter])

Inherited from HasProps

`__init__`(args, *kwargs)
`__setattr__`(name, value)	Intercept attribute setting on HasProps in order to special case a few situations:
`__getattr__`(name)	Intercept attribute setting on HasProps in order to special case a few situations:
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`equals`(other)	Structural equality of models.
`static_to_serializable`(serializer)
`to_serializable`(serializer)
`set_from_json`(name, json, *[, models, setter])	Set a property value on this object from JSON.
`update`(**kwargs)	Updates the object's properties from the given keyword arguments.
`update_from_json`(json_attributes, *[, ...])	Updates the object's properties from a JSON attributes dictionary.
`lookup`(name, *[, raises])	Find the `PropertyDescriptor` for a Bokeh property on a class, given the property name.
`properties`(*[, _with_props])	Collect the names of properties on this class.
`properties_with_refs`()	Collect the names of all properties on this class that also have references.
`dataspecs`()	Collect the names of all `DataSpec` properties on this class.
`properties_with_values`(*[, ...])	Collect a dict mapping property names to their values.
`query_properties_with_values`(query, *[, ...])	Query the properties values of `HasProps` instances with a predicate.
`themed_values`()	Get any theme-provided overrides.
`apply_theme`(property_values)	Apply a set of theme values which will be used rather than defaults, but will not override application-set values.
`unapply_theme`()	Remove any themed values and restore defaults.

Inherited from HasDocumentRef

__init__(*args, **kwargs)

Inherited from PropertyCallbackManager

`__init__`(args, *kwargs)
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`remove_on_change`(attr, *callbacks)	Remove a callback from this object
`trigger`(attr, old, new[, hint, setter])

Inherited from EventCallbackManager

`__init__`(args, *kwargs)
`on_event`(event, *callbacks)	Run callbacks when the specified event occurs on this Model

align = 'start'¶

Type: Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

The alignment point within the parent container.

This property is useful only if this component is a child element of a layout (e.g. a grid). Self alignment can be overridden by the parent container (e.g. grid track align).

aspect_ratio = None¶

Type: Either(Null, Auto, Float)

Describes the proportional relationship between component’s width and height.

background = None¶

Type: Nullable(Color)

Background color of the component.

children = []¶

Type: List

The list of children, which can be other components including plots, rows, columns, and widgets.

cols = 'auto'¶

Type: Either(Either(Enum(Enumeration(auto, min, fit, max)), Int), Dict(Either(Int, String), Either(Either(Enum(Enumeration(auto, min, fit, max)), Int), Struct, Struct, Struct)))

Describes how the component should maintain its columns’ widths.

Note

This is an experimental feature and may change in future. Use it at your own discretion.

css_classes = []¶

Type: List

A list of CSS class names to add to this DOM element. Note: the class names are simply added as-is, no other guarantees are provided.

It is also permissible to assign from tuples, however these are adapted – the property will always contain a list.

disabled = False¶

Type: Bool

Whether the widget will be disabled when rendered.

If True, the widget will be greyed-out and not responsive to UI events.

height = None¶

Type: Nullable(NonNegativeInt)

The height of the component (in pixels).

This can be either fixed or preferred height, depending on height sizing policy.

height_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its height.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly height pixels. Component will overflow if it can’t fit in the available vertical space.
"fit": Use component’s preferred height (if set) and allow to fit into the available vertical space within the minimum and maximum height bounds (if set). Component’s height neither will be aggressively minimized nor maximized.
"min": Use as little vertical space as possible, not less than the minimum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much vertical space as possible, not more than the maximum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

margin = (0, 0, 0, 0)¶

Type: Nullable(Tuple(Int, Int, Int, Int))

max_height = None¶

Type: Nullable(NonNegativeInt)

Maximal height of the component (in pixels) if height is adjustable.

max_width = None¶

Type: Nullable(NonNegativeInt)

Maximal width of the component (in pixels) if width is adjustable.

min_height = None¶

Type: Nullable(NonNegativeInt)

Minimal height of the component (in pixels) if height is adjustable.

min_width = None¶

Type: Nullable(NonNegativeInt)

Minimal width of the component (in pixels) if width is adjustable.

name = None¶

Type: Nullable(String)

An arbitrary, user-supplied name for this model.

This name can be useful when querying the document to retrieve specific Bokeh models.

>>> plot.circle([1,2,3], [4,5,6], name="temp")
>>> plot.select(name="temp")
[GlyphRenderer(id='399d53f5-73e9-44d9-9527-544b761c7705', ...)]

Note

No uniqueness guarantees or other conditions are enforced on any names that are provided, nor is the name used directly by Bokeh for any reason.

sizing_mode = None¶

Type: Nullable(Enum(SizingMode))

How the component should size itself.

Possible scenarios:

"fixed": Component is not responsive. It will retain its original width and height regardless of any subsequent browser window resize events.
"stretch_width": Component will responsively resize to stretch to the available width, without maintaining any aspect ratio. The height of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_height": Component will responsively resize to stretch to the available height, without maintaining any aspect ratio. The width of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_both": Component is completely responsive, independently in width and height, and will occupy all the available horizontal and vertical space, even if this changes the aspect ratio of the component.
"scale_width": Component will responsively resize to stretch to the available width, while maintaining the original or provided aspect ratio.
"scale_height": Component will responsively resize to stretch to the available height, while maintaining the original or provided aspect ratio.
"scale_both": Component will responsively resize to both the available width and height, while maintaining the original or provided aspect ratio.

spacing = 0¶

Type: Int

The gap between children (in pixels).

syncable = True¶

Type: Bool

Note

Setting this property to False will prevent any on_change() callbacks on this object from triggering. However, any JS-side callbacks will still work.

tags = []¶

Type: List

An optional list of arbitrary, user-supplied values to attach to this model.

This data can be useful when querying the document to retrieve specific Bokeh models:

>>> r = plot.circle([1,2,3], [4,5,6])
>>> r.tags = ["foo", 10]
>>> plot.select(tags=['foo', 10])
[GlyphRenderer(id='1de4c3df-a83d-480a-899b-fb263d3d5dd9', ...)]

Or simply a convenient way to attach any necessary metadata to a model that can be accessed by CustomJS callbacks, etc.

Note

No uniqueness guarantees or other conditions are enforced on any tags that are provided, nor are the tags used directly by Bokeh for any reason.

visible = True¶

Type: Bool

Whether the component will be visible and a part of a layout.

width = None¶

Type: Nullable(NonNegativeInt)

The width of the component (in pixels).

This can be either fixed or preferred width, depending on width sizing policy.

width_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its width.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly width pixels. Component will overflow if it can’t fit in the available horizontal space.
"fit": Use component’s preferred width (if set) and allow it to fit into the available horizontal space within the minimum and maximum width bounds (if set). Component’s width neither will be aggressively minimized nor maximized.
"min": Use as little horizontal space as possible, not less than the minimum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much horizontal space as possible, not more than the maximum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

apply_theme(property_values: Dict[str, Any]) → None¶

Apply a set of theme values which will be used rather than defaults, but will not override application-set values.

The passed-in dictionary may be kept around as-is and shared with other instances to save memory (so neither the caller nor the HasProps instance should modify it).

Parameters: property_values (dict) – theme values to use in place of defaults
Returns: None

classmethod dataspecs() → Dict[str, DataSpec]¶

Collect the names of all DataSpec properties on this class.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of DataSpec properties
Return type: set[str]

destroy() → None¶: Clean up references to the document and property

equals(other: bokeh.core.has_props.HasProps) → bool¶

Structural equality of models.

Parameters: other (HasProps) – the other instance to compare to
Returns: True, if properties are structurally equal, otherwise False

js_link(attr: str, other: Model, other_attr: str, attr_selector: int | str | None = None) → None¶

Link two Bokeh model properties using JavaScript.

This is a convenience method that simplifies adding a CustomJS callback to update one Bokeh model property whenever another changes value.

Parameters

attr (str) – The name of a Bokeh property on this model
other (Model) – A Bokeh model to link to self.attr
other_attr (str) – The property on other to link together
attr_selector (Union[int, str]) – The index to link an item in a subscriptable attr

Added in version 1.1

Raises: ValueError –

Examples

This code with js_link:

select.js_link('value', plot, 'sizing_mode')

is equivalent to the following:

from bokeh.models import CustomJS
select.js_on_change('value',
    CustomJS(args=dict(other=plot),
             code="other.sizing_mode = this.value"
    )
)

Additionally, to use attr_selector to attach the left side of a range slider to a plot’s x_range:

range_slider.js_link('value', plot.x_range, 'start', attr_selector=0)

which is equivalent to:

from bokeh.models import CustomJS
range_slider.js_on_change('value',
    CustomJS(args=dict(other=plot.x_range),
             code="other.start = this.value[0]"
    )
)

js_on_change(event: str, *callbacks: JSEventCallback) → None¶

Attach a CustomJS callback to an arbitrary BokehJS model event.

# these two are equivalent
source.js_on_change('data', callback)
source.js_on_change('change:data', callback)

source.js_on_change('streaming', callback)

classmethod lookup(name: str, *, raises: bool = True) → PropertyDescriptor[Any] | None¶

Find the PropertyDescriptor for a Bokeh property on a class, given the property name.

Parameters

name (str) – name of the property to search for
raises (bool) – whether to raise or return None if missing

Returns

descriptor for property named name

Return type

on_change(attr: str, *callbacks: PropertyCallback) → None¶

Add a callback on this object to trigger when attr changes.

Parameters

attr (str) – an attribute name on this object
*callbacks (callable) – callback functions to register

Returns

None

Example:

widget.on_change('value', callback1, callback2, ..., callback_n)

on_event(event: str | Type[Event], *callbacks: EventCallback) → None¶

Run callbacks when the specified event occurs on this Model

Not all Events are supported for all Models. See specific Events in bokeh.events for more information on which Models are able to trigger them.

classmethod properties(*, _with_props: bool = False) → Union[Set[str], Dict[str, Property[Any]]]¶

Collect the names of properties on this class.

Warning

In a future version of Bokeh, this method will return a dictionary mapping property names to property objects. To future-proof this current usage of this method, wrap the return value in list.

Returns: property names

classmethod properties_with_refs() → Dict[str, Property[Any]]¶

Collect the names of all properties on this class that also have references.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of properties that have references
Return type: set[str]

properties_with_values(*, include_defaults: bool = True, include_undefined: bool = False) → Dict[str, Any]¶

Collect a dict mapping property names to their values.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Parameters: include_defaults (bool, optional) – Whether to include properties that haven’t been explicitly set since the object was created. (default: True)
Returns: mapping from property names to their values
Return type: dict

Query the properties values of HasProps instances with a predicate.

Parameters

query (callable) – A callable that accepts property descriptors and returns True or False
include_defaults (bool, optional) – Whether to include properties that have not been explicitly set by a user (default: True)

Returns

mapping of property names and values for matching properties

Return type

references() → Set[bokeh.model.model.Model]¶: Returns all Models that this object has references to.

remove_on_change(attr: str, *callbacks: Callable[[str, Any, Any], None]) → None¶: Remove a callback from this object

select(selector: SelectorType) → Iterable[Model]¶

Query this object and all of its references for objects that match the given selector.

Parameters: selector (JSON-like) –
Returns: seq[Model]

select_one(selector: SelectorType) → Model | None¶

Returns: Model

set_from_json(name: str, json: JSON, *, models: Dict[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Set a property value on this object from JSON.

Parameters

name – (str) : name of the attribute to set
json – (JSON-value) : value to set to the attribute to
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

set_select(selector: Type[Model] | SelectorType, updates: Dict[str, Unknown]) → None¶

Update objects that match a given selector with the specified attribute/value updates.

Parameters

selector (JSON-like) –
updates (dict) –

Returns

None

themed_values() → Dict[str, Unknown] | None¶

Get any theme-provided overrides.

Results are returned as a dict from property name to value, or None if no theme overrides any values for this instance.

Returns: dict or None

to_json(include_defaults: bool) → JSON¶

Returns a dictionary of the attributes of this object, containing only “JSON types” (string, number, boolean, none, dict, list).

References to other objects are serialized as “refs” (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

to_json_string(include_defaults: bool) → str¶

Returns a JSON string encoding the attributes of this object.

References to other objects are serialized as references (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json_string() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

trigger(attr: str, old: Unknown, new: Unknown, hint: DocumentPatchedEvent | None = None, setter: Setter | None = None) → None¶

unapply_theme() → None¶

Remove any themed values and restore defaults.

Returns: None

update(**kwargs: Any) → None¶

Updates the object’s properties from the given keyword arguments.

Returns: None

Examples

The following are equivalent:

from bokeh.models import Range1d

r = Range1d

# set properties individually:
r.start = 10
r.end = 20

# update properties together:
r.update(start=10, end=20)

update_from_json(json_attributes: Dict[str, JSON], *, models: Mapping[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Updates the object’s properties from a JSON attributes dictionary.

Parameters

json_attributes – (JSON-dict) : attributes and values to update
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

property document: Document | None¶: The Document this model is attached to (can be None)

property struct: bokeh.core.types.ReferenceJson¶

A Bokeh protocol “structure” of this model, i.e. a dict of the form:

{
    'type' : << view model name >>
    'id'   : << unique model id >>
}

Additionally there may be a subtype field if this model is a subtype.

Spacer¶

class Spacer(*args, **kwargs)[source]¶

A container for space used to fill an empty spot in a row or column.

JSON Prototype

{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "css_classes": [],
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "18245",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    0,
    0,
    0,
    0
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "sizing_mode": null,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

Inherited from LayoutDOM

`disabled`	Whether the widget will be disabled when rendered.
`visible`	Whether the component will be visible and a part of a layout.
`width`	The width of the component (in pixels).
`height`	The height of the component (in pixels).
`min_width`	Minimal width of the component (in pixels) if width is adjustable.
`min_height`	Minimal height of the component (in pixels) if height is adjustable.
`max_width`	Maximal width of the component (in pixels) if width is adjustable.
`max_height`	Maximal height of the component (in pixels) if height is adjustable.
`margin`	Allows to create additional space around the component.
`width_policy`	Describes how the component should maintain its width.
`height_policy`	Describes how the component should maintain its height.
`aspect_ratio`	Describes the proportional relationship between component's width and height.
`sizing_mode`	How the component should size itself.
`align`	The alignment point within the parent container.
`background`	Background color of the component.
`css_classes`	A list of CSS class names to add to this DOM element.

Inherited from Model

`model_class_reverse_map`
`id`
`ref`
`struct`	A Bokeh protocol "structure" of this model, i.e. a dict of the form:.
`name`	An arbitrary, user-supplied name for this model.
`tags`	An optional list of arbitrary, user-supplied values to attach to this model.
`js_event_callbacks`	A mapping of event names to lists of `CustomJS` callbacks.
`subscribed_events`	List of events that are subscribed to by Python callbacks.
`js_property_callbacks`	A mapping of attribute names to lists of `CustomJS` callbacks, to be set up on BokehJS side when the document is created.
`syncable`	Indicates whether this model should be synchronized back to a Bokeh server when updated in a web browser.

Inherited from HasDocumentRef

The Document this model is attached to (can be None)

Public Methods:

Inherited from Model

`__init_subclass__`()
`__new__`(cls, args, *kwargs)
`__init__`(**kwargs)
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`destroy`()	Clean up references to the document and property
`js_on_event`(event, *callbacks)
`js_link`(attr, other, other_attr[, attr_selector])	Link two Bokeh model properties using JavaScript.
`js_on_change`(event, *callbacks)	Attach a `CustomJS` callback to an arbitrary BokehJS model event.
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`references`()	Returns all `Models` that this object has references to.
`select`(selector)	Query this object and all of its references for objects that match the given selector.
`select_one`(selector)	Query this object and all of its references for objects that match the given selector.
`set_select`(selector, updates)	Update objects that match a given selector with the specified attribute/value updates.
`to_json`(include_defaults)	Returns a dictionary of the attributes of this object, containing only "JSON types" (string, number, boolean, none, dict, list).
`to_json_string`(include_defaults)	Returns a JSON string encoding the attributes of this object.
`trigger`(attr, old, new[, hint, setter])

Inherited from HasProps

`__init__`(**kwargs)
`__setattr__`(name, value)	Intercept attribute setting on HasProps in order to special case a few situations:
`__getattr__`(name)	Intercept attribute setting on HasProps in order to special case a few situations:
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`equals`(other)	Structural equality of models.
`static_to_serializable`(serializer)
`to_serializable`(serializer)
`set_from_json`(name, json, *[, models, setter])	Set a property value on this object from JSON.
`update`(**kwargs)	Updates the object's properties from the given keyword arguments.
`update_from_json`(json_attributes, *[, ...])	Updates the object's properties from a JSON attributes dictionary.
`lookup`(name, *[, raises])	Find the `PropertyDescriptor` for a Bokeh property on a class, given the property name.
`properties`(*[, _with_props])	Collect the names of properties on this class.
`properties_with_refs`()	Collect the names of all properties on this class that also have references.
`dataspecs`()	Collect the names of all `DataSpec` properties on this class.
`properties_with_values`(*[, ...])	Collect a dict mapping property names to their values.
`query_properties_with_values`(query, *[, ...])	Query the properties values of `HasProps` instances with a predicate.
`themed_values`()	Get any theme-provided overrides.
`apply_theme`(property_values)	Apply a set of theme values which will be used rather than defaults, but will not override application-set values.
`unapply_theme`()	Remove any themed values and restore defaults.

Inherited from HasDocumentRef

__init__(**kwargs)

Inherited from PropertyCallbackManager

`__init__`(**kwargs)
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`remove_on_change`(attr, *callbacks)	Remove a callback from this object
`trigger`(attr, old, new[, hint, setter])

Inherited from EventCallbackManager

`__init__`(**kwargs)
`on_event`(event, *callbacks)	Run callbacks when the specified event occurs on this Model

align = 'start'¶

Type: Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

The alignment point within the parent container.

This property is useful only if this component is a child element of a layout (e.g. a grid). Self alignment can be overridden by the parent container (e.g. grid track align).

aspect_ratio = None¶

Type: Either(Null, Auto, Float)

Describes the proportional relationship between component’s width and height.

background = None¶

Type: Nullable(Color)

Background color of the component.

css_classes = []¶

Type: List

A list of CSS class names to add to this DOM element. Note: the class names are simply added as-is, no other guarantees are provided.

It is also permissible to assign from tuples, however these are adapted – the property will always contain a list.

disabled = False¶

Type: Bool

Whether the widget will be disabled when rendered.

If True, the widget will be greyed-out and not responsive to UI events.

height = None¶

Type: Nullable(NonNegativeInt)

The height of the component (in pixels).

This can be either fixed or preferred height, depending on height sizing policy.

height_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its height.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly height pixels. Component will overflow if it can’t fit in the available vertical space.
"fit": Use component’s preferred height (if set) and allow to fit into the available vertical space within the minimum and maximum height bounds (if set). Component’s height neither will be aggressively minimized nor maximized.
"min": Use as little vertical space as possible, not less than the minimum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much vertical space as possible, not more than the maximum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

margin = (0, 0, 0, 0)¶

Type: Nullable(Tuple(Int, Int, Int, Int))

max_height = None¶

Type: Nullable(NonNegativeInt)

Maximal height of the component (in pixels) if height is adjustable.

max_width = None¶

Type: Nullable(NonNegativeInt)

Maximal width of the component (in pixels) if width is adjustable.

min_height = None¶

Type: Nullable(NonNegativeInt)

Minimal height of the component (in pixels) if height is adjustable.

min_width = None¶

Type: Nullable(NonNegativeInt)

Minimal width of the component (in pixels) if width is adjustable.

name = None¶

Type: Nullable(String)

An arbitrary, user-supplied name for this model.

This name can be useful when querying the document to retrieve specific Bokeh models.

>>> plot.circle([1,2,3], [4,5,6], name="temp")
>>> plot.select(name="temp")
[GlyphRenderer(id='399d53f5-73e9-44d9-9527-544b761c7705', ...)]

Note

No uniqueness guarantees or other conditions are enforced on any names that are provided, nor is the name used directly by Bokeh for any reason.

sizing_mode = None¶

Type: Nullable(Enum(SizingMode))

How the component should size itself.

Possible scenarios:

"fixed": Component is not responsive. It will retain its original width and height regardless of any subsequent browser window resize events.
"stretch_width": Component will responsively resize to stretch to the available width, without maintaining any aspect ratio. The height of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_height": Component will responsively resize to stretch to the available height, without maintaining any aspect ratio. The width of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_both": Component is completely responsive, independently in width and height, and will occupy all the available horizontal and vertical space, even if this changes the aspect ratio of the component.
"scale_width": Component will responsively resize to stretch to the available width, while maintaining the original or provided aspect ratio.
"scale_height": Component will responsively resize to stretch to the available height, while maintaining the original or provided aspect ratio.
"scale_both": Component will responsively resize to both the available width and height, while maintaining the original or provided aspect ratio.

syncable = True¶

Type: Bool

Note

Setting this property to False will prevent any on_change() callbacks on this object from triggering. However, any JS-side callbacks will still work.

tags = []¶

Type: List

An optional list of arbitrary, user-supplied values to attach to this model.

This data can be useful when querying the document to retrieve specific Bokeh models:

>>> r = plot.circle([1,2,3], [4,5,6])
>>> r.tags = ["foo", 10]
>>> plot.select(tags=['foo', 10])
[GlyphRenderer(id='1de4c3df-a83d-480a-899b-fb263d3d5dd9', ...)]

Or simply a convenient way to attach any necessary metadata to a model that can be accessed by CustomJS callbacks, etc.

Note

No uniqueness guarantees or other conditions are enforced on any tags that are provided, nor are the tags used directly by Bokeh for any reason.

visible = True¶

Type: Bool

Whether the component will be visible and a part of a layout.

width = None¶

Type: Nullable(NonNegativeInt)

The width of the component (in pixels).

This can be either fixed or preferred width, depending on width sizing policy.

width_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its width.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly width pixels. Component will overflow if it can’t fit in the available horizontal space.
"fit": Use component’s preferred width (if set) and allow it to fit into the available horizontal space within the minimum and maximum width bounds (if set). Component’s width neither will be aggressively minimized nor maximized.
"min": Use as little horizontal space as possible, not less than the minimum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much horizontal space as possible, not more than the maximum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

apply_theme(property_values: Dict[str, Any]) → None¶

Apply a set of theme values which will be used rather than defaults, but will not override application-set values.

The passed-in dictionary may be kept around as-is and shared with other instances to save memory (so neither the caller nor the HasProps instance should modify it).

Parameters: property_values (dict) – theme values to use in place of defaults
Returns: None

classmethod dataspecs() → Dict[str, DataSpec]¶

Collect the names of all DataSpec properties on this class.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of DataSpec properties
Return type: set[str]

destroy() → None¶: Clean up references to the document and property

equals(other: bokeh.core.has_props.HasProps) → bool¶

Structural equality of models.

Parameters: other (HasProps) – the other instance to compare to
Returns: True, if properties are structurally equal, otherwise False

js_link(attr: str, other: Model, other_attr: str, attr_selector: int | str | None = None) → None¶

Link two Bokeh model properties using JavaScript.

This is a convenience method that simplifies adding a CustomJS callback to update one Bokeh model property whenever another changes value.

Parameters

attr (str) – The name of a Bokeh property on this model
other (Model) – A Bokeh model to link to self.attr
other_attr (str) – The property on other to link together
attr_selector (Union[int, str]) – The index to link an item in a subscriptable attr

Added in version 1.1

Raises: ValueError –

Examples

This code with js_link:

select.js_link('value', plot, 'sizing_mode')

is equivalent to the following:

from bokeh.models import CustomJS
select.js_on_change('value',
    CustomJS(args=dict(other=plot),
             code="other.sizing_mode = this.value"
    )
)

Additionally, to use attr_selector to attach the left side of a range slider to a plot’s x_range:

range_slider.js_link('value', plot.x_range, 'start', attr_selector=0)

which is equivalent to:

from bokeh.models import CustomJS
range_slider.js_on_change('value',
    CustomJS(args=dict(other=plot.x_range),
             code="other.start = this.value[0]"
    )
)

js_on_change(event: str, *callbacks: JSEventCallback) → None¶

Attach a CustomJS callback to an arbitrary BokehJS model event.

# these two are equivalent
source.js_on_change('data', callback)
source.js_on_change('change:data', callback)

source.js_on_change('streaming', callback)

classmethod lookup(name: str, *, raises: bool = True) → PropertyDescriptor[Any] | None¶

Find the PropertyDescriptor for a Bokeh property on a class, given the property name.

Parameters

name (str) – name of the property to search for
raises (bool) – whether to raise or return None if missing

Returns

descriptor for property named name

Return type

on_change(attr: str, *callbacks: PropertyCallback) → None¶

Add a callback on this object to trigger when attr changes.

Parameters

attr (str) – an attribute name on this object
*callbacks (callable) – callback functions to register

Returns

None

Example:

widget.on_change('value', callback1, callback2, ..., callback_n)

on_event(event: str | Type[Event], *callbacks: EventCallback) → None¶

Run callbacks when the specified event occurs on this Model

Not all Events are supported for all Models. See specific Events in bokeh.events for more information on which Models are able to trigger them.

classmethod properties(*, _with_props: bool = False) → Union[Set[str], Dict[str, Property[Any]]]¶

Collect the names of properties on this class.

Warning

In a future version of Bokeh, this method will return a dictionary mapping property names to property objects. To future-proof this current usage of this method, wrap the return value in list.

Returns: property names

classmethod properties_with_refs() → Dict[str, Property[Any]]¶

Collect the names of all properties on this class that also have references.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of properties that have references
Return type: set[str]

properties_with_values(*, include_defaults: bool = True, include_undefined: bool = False) → Dict[str, Any]¶

Collect a dict mapping property names to their values.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Parameters: include_defaults (bool, optional) – Whether to include properties that haven’t been explicitly set since the object was created. (default: True)
Returns: mapping from property names to their values
Return type: dict

Query the properties values of HasProps instances with a predicate.

Parameters

query (callable) – A callable that accepts property descriptors and returns True or False
include_defaults (bool, optional) – Whether to include properties that have not been explicitly set by a user (default: True)

Returns

mapping of property names and values for matching properties

Return type

references() → Set[bokeh.model.model.Model]¶: Returns all Models that this object has references to.

remove_on_change(attr: str, *callbacks: Callable[[str, Any, Any], None]) → None¶: Remove a callback from this object

select(selector: SelectorType) → Iterable[Model]¶

Query this object and all of its references for objects that match the given selector.

Parameters: selector (JSON-like) –
Returns: seq[Model]

select_one(selector: SelectorType) → Model | None¶

Returns: Model

set_from_json(name: str, json: JSON, *, models: Dict[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Set a property value on this object from JSON.

Parameters

name – (str) : name of the attribute to set
json – (JSON-value) : value to set to the attribute to
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

set_select(selector: Type[Model] | SelectorType, updates: Dict[str, Unknown]) → None¶

Update objects that match a given selector with the specified attribute/value updates.

Parameters

selector (JSON-like) –
updates (dict) –

Returns

None

themed_values() → Dict[str, Unknown] | None¶

Get any theme-provided overrides.

Results are returned as a dict from property name to value, or None if no theme overrides any values for this instance.

Returns: dict or None

to_json(include_defaults: bool) → JSON¶

Returns a dictionary of the attributes of this object, containing only “JSON types” (string, number, boolean, none, dict, list).

References to other objects are serialized as “refs” (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

to_json_string(include_defaults: bool) → str¶

Returns a JSON string encoding the attributes of this object.

References to other objects are serialized as references (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json_string() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

trigger(attr: str, old: Unknown, new: Unknown, hint: DocumentPatchedEvent | None = None, setter: Setter | None = None) → None¶

unapply_theme() → None¶

Remove any themed values and restore defaults.

Returns: None

update(**kwargs: Any) → None¶

Updates the object’s properties from the given keyword arguments.

Returns: None

Examples

The following are equivalent:

from bokeh.models import Range1d

r = Range1d

# set properties individually:
r.start = 10
r.end = 20

# update properties together:
r.update(start=10, end=20)

update_from_json(json_attributes: Dict[str, JSON], *, models: Mapping[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Updates the object’s properties from a JSON attributes dictionary.

Parameters

json_attributes – (JSON-dict) : attributes and values to update
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

property document: Document | None¶: The Document this model is attached to (can be None)

property struct: bokeh.core.types.ReferenceJson¶

A Bokeh protocol “structure” of this model, i.e. a dict of the form:

{
    'type' : << view model name >>
    'id'   : << unique model id >>
}

Additionally there may be a subtype field if this model is a subtype.

Tabs¶

class Tabs(*args, **kwargs)[source]¶

A panel widget with navigation tabs.

Example

from bokeh.io import show
from bokeh.models import Panel, Tabs
from bokeh.plotting import figure

p1 = figure(width=300, height=300)
p1.circle([1, 2, 3, 4, 5], [6, 7, 2, 4, 5], size=20, color="navy", alpha=0.5)
tab1 = Panel(child=p1, title="circle")

p2 = figure(width=300, height=300)
p2.line([1, 2, 3, 4, 5], [6, 7, 2, 4, 5], line_width=3, color="navy", alpha=0.5)
tab2 = Panel(child=p2, title="line")

show(Tabs(tabs=[tab1, tab2]))

JSON Prototype

{
  "active": 0,
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "css_classes": [],
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "18265",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    0,
    0,
    0,
    0
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "sizing_mode": null,
  "subscribed_events": [],
  "syncable": true,
  "tabs": [],
  "tabs_location": "above",
  "tags": [],
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

`tabs`	The list of child panel widgets.
`tabs_location`	The location of the buttons that activate tabs.
`active`	The index of the active tab.

Inherited from LayoutDOM

`disabled`	Whether the widget will be disabled when rendered.
`visible`	Whether the component will be visible and a part of a layout.
`width`	The width of the component (in pixels).
`height`	The height of the component (in pixels).
`min_width`	Minimal width of the component (in pixels) if width is adjustable.
`min_height`	Minimal height of the component (in pixels) if height is adjustable.
`max_width`	Maximal width of the component (in pixels) if width is adjustable.
`max_height`	Maximal height of the component (in pixels) if height is adjustable.
`margin`	Allows to create additional space around the component.
`width_policy`	Describes how the component should maintain its width.
`height_policy`	Describes how the component should maintain its height.
`aspect_ratio`	Describes the proportional relationship between component's width and height.
`sizing_mode`	How the component should size itself.
`align`	The alignment point within the parent container.
`background`	Background color of the component.
`css_classes`	A list of CSS class names to add to this DOM element.

Inherited from Model

`model_class_reverse_map`
`id`
`ref`
`struct`	A Bokeh protocol "structure" of this model, i.e. a dict of the form:.
`name`	An arbitrary, user-supplied name for this model.
`tags`	An optional list of arbitrary, user-supplied values to attach to this model.
`js_event_callbacks`	A mapping of event names to lists of `CustomJS` callbacks.
`subscribed_events`	List of events that are subscribed to by Python callbacks.
`js_property_callbacks`	A mapping of attribute names to lists of `CustomJS` callbacks, to be set up on BokehJS side when the document is created.
`syncable`	Indicates whether this model should be synchronized back to a Bokeh server when updated in a web browser.

Inherited from HasDocumentRef

The Document this model is attached to (can be None)

Public Methods:

Inherited from Model

`__init_subclass__`()
`__new__`(cls, args, *kwargs)
`__init__`(**kwargs)
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`destroy`()	Clean up references to the document and property
`js_on_event`(event, *callbacks)
`js_link`(attr, other, other_attr[, attr_selector])	Link two Bokeh model properties using JavaScript.
`js_on_change`(event, *callbacks)	Attach a `CustomJS` callback to an arbitrary BokehJS model event.
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`references`()	Returns all `Models` that this object has references to.
`select`(selector)	Query this object and all of its references for objects that match the given selector.
`select_one`(selector)	Query this object and all of its references for objects that match the given selector.
`set_select`(selector, updates)	Update objects that match a given selector with the specified attribute/value updates.
`to_json`(include_defaults)	Returns a dictionary of the attributes of this object, containing only "JSON types" (string, number, boolean, none, dict, list).
`to_json_string`(include_defaults)	Returns a JSON string encoding the attributes of this object.
`trigger`(attr, old, new[, hint, setter])

Inherited from HasProps

`__init__`(**kwargs)
`__setattr__`(name, value)	Intercept attribute setting on HasProps in order to special case a few situations:
`__getattr__`(name)	Intercept attribute setting on HasProps in order to special case a few situations:
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`equals`(other)	Structural equality of models.
`static_to_serializable`(serializer)
`to_serializable`(serializer)
`set_from_json`(name, json, *[, models, setter])	Set a property value on this object from JSON.
`update`(**kwargs)	Updates the object's properties from the given keyword arguments.
`update_from_json`(json_attributes, *[, ...])	Updates the object's properties from a JSON attributes dictionary.
`lookup`(name, *[, raises])	Find the `PropertyDescriptor` for a Bokeh property on a class, given the property name.
`properties`(*[, _with_props])	Collect the names of properties on this class.
`properties_with_refs`()	Collect the names of all properties on this class that also have references.
`dataspecs`()	Collect the names of all `DataSpec` properties on this class.
`properties_with_values`(*[, ...])	Collect a dict mapping property names to their values.
`query_properties_with_values`(query, *[, ...])	Query the properties values of `HasProps` instances with a predicate.
`themed_values`()	Get any theme-provided overrides.
`apply_theme`(property_values)	Apply a set of theme values which will be used rather than defaults, but will not override application-set values.
`unapply_theme`()	Remove any themed values and restore defaults.

Inherited from HasDocumentRef

__init__(**kwargs)

Inherited from PropertyCallbackManager

`__init__`(**kwargs)
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`remove_on_change`(attr, *callbacks)	Remove a callback from this object
`trigger`(attr, old, new[, hint, setter])

Inherited from EventCallbackManager

`__init__`(**kwargs)
`on_event`(event, *callbacks)	Run callbacks when the specified event occurs on this Model

active = 0¶

Type: Int

The index of the active tab.

align = 'start'¶

Type: Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

The alignment point within the parent container.

This property is useful only if this component is a child element of a layout (e.g. a grid). Self alignment can be overridden by the parent container (e.g. grid track align).

aspect_ratio = None¶

Type: Either(Null, Auto, Float)

Describes the proportional relationship between component’s width and height.

background = None¶

Type: Nullable(Color)

Background color of the component.

css_classes = []¶

Type: List

A list of CSS class names to add to this DOM element. Note: the class names are simply added as-is, no other guarantees are provided.

It is also permissible to assign from tuples, however these are adapted – the property will always contain a list.

disabled = False¶

Type: Bool

Whether the widget will be disabled when rendered.

If True, the widget will be greyed-out and not responsive to UI events.

height = None¶

Type: Nullable(NonNegativeInt)

The height of the component (in pixels).

This can be either fixed or preferred height, depending on height sizing policy.

height_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its height.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly height pixels. Component will overflow if it can’t fit in the available vertical space.
"fit": Use component’s preferred height (if set) and allow to fit into the available vertical space within the minimum and maximum height bounds (if set). Component’s height neither will be aggressively minimized nor maximized.
"min": Use as little vertical space as possible, not less than the minimum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much vertical space as possible, not more than the maximum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

margin = (0, 0, 0, 0)¶

Type: Nullable(Tuple(Int, Int, Int, Int))

max_height = None¶

Type: Nullable(NonNegativeInt)

Maximal height of the component (in pixels) if height is adjustable.

max_width = None¶

Type: Nullable(NonNegativeInt)

Maximal width of the component (in pixels) if width is adjustable.

min_height = None¶

Type: Nullable(NonNegativeInt)

Minimal height of the component (in pixels) if height is adjustable.

min_width = None¶

Type: Nullable(NonNegativeInt)

Minimal width of the component (in pixels) if width is adjustable.

name = None¶

Type: Nullable(String)

An arbitrary, user-supplied name for this model.

This name can be useful when querying the document to retrieve specific Bokeh models.

>>> plot.circle([1,2,3], [4,5,6], name="temp")
>>> plot.select(name="temp")
[GlyphRenderer(id='399d53f5-73e9-44d9-9527-544b761c7705', ...)]

Note

No uniqueness guarantees or other conditions are enforced on any names that are provided, nor is the name used directly by Bokeh for any reason.

sizing_mode = None¶

Type: Nullable(Enum(SizingMode))

How the component should size itself.

Possible scenarios:

"fixed": Component is not responsive. It will retain its original width and height regardless of any subsequent browser window resize events.
"stretch_width": Component will responsively resize to stretch to the available width, without maintaining any aspect ratio. The height of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_height": Component will responsively resize to stretch to the available height, without maintaining any aspect ratio. The width of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_both": Component is completely responsive, independently in width and height, and will occupy all the available horizontal and vertical space, even if this changes the aspect ratio of the component.
"scale_width": Component will responsively resize to stretch to the available width, while maintaining the original or provided aspect ratio.
"scale_height": Component will responsively resize to stretch to the available height, while maintaining the original or provided aspect ratio.
"scale_both": Component will responsively resize to both the available width and height, while maintaining the original or provided aspect ratio.

syncable = True¶

Type: Bool

Note

Setting this property to False will prevent any on_change() callbacks on this object from triggering. However, any JS-side callbacks will still work.

tabs = []¶

Type: List

The list of child panel widgets.

tabs_location = 'above'¶

Type: Enum(Location)

The location of the buttons that activate tabs.

tags = []¶

Type: List

An optional list of arbitrary, user-supplied values to attach to this model.

This data can be useful when querying the document to retrieve specific Bokeh models:

>>> r = plot.circle([1,2,3], [4,5,6])
>>> r.tags = ["foo", 10]
>>> plot.select(tags=['foo', 10])
[GlyphRenderer(id='1de4c3df-a83d-480a-899b-fb263d3d5dd9', ...)]

Or simply a convenient way to attach any necessary metadata to a model that can be accessed by CustomJS callbacks, etc.

Note

No uniqueness guarantees or other conditions are enforced on any tags that are provided, nor are the tags used directly by Bokeh for any reason.

visible = True¶

Type: Bool

Whether the component will be visible and a part of a layout.

width = None¶

Type: Nullable(NonNegativeInt)

The width of the component (in pixels).

This can be either fixed or preferred width, depending on width sizing policy.

width_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its width.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly width pixels. Component will overflow if it can’t fit in the available horizontal space.
"fit": Use component’s preferred width (if set) and allow it to fit into the available horizontal space within the minimum and maximum width bounds (if set). Component’s width neither will be aggressively minimized nor maximized.
"min": Use as little horizontal space as possible, not less than the minimum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much horizontal space as possible, not more than the maximum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

apply_theme(property_values: Dict[str, Any]) → None¶

Apply a set of theme values which will be used rather than defaults, but will not override application-set values.

The passed-in dictionary may be kept around as-is and shared with other instances to save memory (so neither the caller nor the HasProps instance should modify it).

Parameters: property_values (dict) – theme values to use in place of defaults
Returns: None

classmethod dataspecs() → Dict[str, DataSpec]¶

Collect the names of all DataSpec properties on this class.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of DataSpec properties
Return type: set[str]

destroy() → None¶: Clean up references to the document and property

equals(other: bokeh.core.has_props.HasProps) → bool¶

Structural equality of models.

Parameters: other (HasProps) – the other instance to compare to
Returns: True, if properties are structurally equal, otherwise False

js_link(attr: str, other: Model, other_attr: str, attr_selector: int | str | None = None) → None¶

Link two Bokeh model properties using JavaScript.

This is a convenience method that simplifies adding a CustomJS callback to update one Bokeh model property whenever another changes value.

Parameters

attr (str) – The name of a Bokeh property on this model
other (Model) – A Bokeh model to link to self.attr
other_attr (str) – The property on other to link together
attr_selector (Union[int, str]) – The index to link an item in a subscriptable attr

Added in version 1.1

Raises: ValueError –

Examples

This code with js_link:

select.js_link('value', plot, 'sizing_mode')

is equivalent to the following:

from bokeh.models import CustomJS
select.js_on_change('value',
    CustomJS(args=dict(other=plot),
             code="other.sizing_mode = this.value"
    )
)

Additionally, to use attr_selector to attach the left side of a range slider to a plot’s x_range:

range_slider.js_link('value', plot.x_range, 'start', attr_selector=0)

which is equivalent to:

from bokeh.models import CustomJS
range_slider.js_on_change('value',
    CustomJS(args=dict(other=plot.x_range),
             code="other.start = this.value[0]"
    )
)

js_on_change(event: str, *callbacks: JSEventCallback) → None¶

Attach a CustomJS callback to an arbitrary BokehJS model event.

# these two are equivalent
source.js_on_change('data', callback)
source.js_on_change('change:data', callback)

source.js_on_change('streaming', callback)

classmethod lookup(name: str, *, raises: bool = True) → PropertyDescriptor[Any] | None¶

Find the PropertyDescriptor for a Bokeh property on a class, given the property name.

Parameters

name (str) – name of the property to search for
raises (bool) – whether to raise or return None if missing

Returns

descriptor for property named name

Return type

on_change(attr: str, *callbacks: PropertyCallback) → None¶

Add a callback on this object to trigger when attr changes.

Parameters

attr (str) – an attribute name on this object
*callbacks (callable) – callback functions to register

Returns

None

Example:

widget.on_change('value', callback1, callback2, ..., callback_n)

on_event(event: str | Type[Event], *callbacks: EventCallback) → None¶

Run callbacks when the specified event occurs on this Model

Not all Events are supported for all Models. See specific Events in bokeh.events for more information on which Models are able to trigger them.

classmethod properties(*, _with_props: bool = False) → Union[Set[str], Dict[str, Property[Any]]]¶

Collect the names of properties on this class.

Warning

In a future version of Bokeh, this method will return a dictionary mapping property names to property objects. To future-proof this current usage of this method, wrap the return value in list.

Returns: property names

classmethod properties_with_refs() → Dict[str, Property[Any]]¶

Collect the names of all properties on this class that also have references.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of properties that have references
Return type: set[str]

properties_with_values(*, include_defaults: bool = True, include_undefined: bool = False) → Dict[str, Any]¶

Collect a dict mapping property names to their values.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Parameters: include_defaults (bool, optional) – Whether to include properties that haven’t been explicitly set since the object was created. (default: True)
Returns: mapping from property names to their values
Return type: dict

Query the properties values of HasProps instances with a predicate.

Parameters

query (callable) – A callable that accepts property descriptors and returns True or False
include_defaults (bool, optional) – Whether to include properties that have not been explicitly set by a user (default: True)

Returns

mapping of property names and values for matching properties

Return type

references() → Set[bokeh.model.model.Model]¶: Returns all Models that this object has references to.

remove_on_change(attr: str, *callbacks: Callable[[str, Any, Any], None]) → None¶: Remove a callback from this object

select(selector: SelectorType) → Iterable[Model]¶

Query this object and all of its references for objects that match the given selector.

Parameters: selector (JSON-like) –
Returns: seq[Model]

select_one(selector: SelectorType) → Model | None¶

Returns: Model

set_from_json(name: str, json: JSON, *, models: Dict[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Set a property value on this object from JSON.

Parameters

name – (str) : name of the attribute to set
json – (JSON-value) : value to set to the attribute to
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

set_select(selector: Type[Model] | SelectorType, updates: Dict[str, Unknown]) → None¶

Update objects that match a given selector with the specified attribute/value updates.

Parameters

selector (JSON-like) –
updates (dict) –

Returns

None

themed_values() → Dict[str, Unknown] | None¶

Get any theme-provided overrides.

Results are returned as a dict from property name to value, or None if no theme overrides any values for this instance.

Returns: dict or None

to_json(include_defaults: bool) → JSON¶

Returns a dictionary of the attributes of this object, containing only “JSON types” (string, number, boolean, none, dict, list).

References to other objects are serialized as “refs” (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

to_json_string(include_defaults: bool) → str¶

Returns a JSON string encoding the attributes of this object.

References to other objects are serialized as references (just the object ID and type info), so the deserializer will need to separately have the full attributes of those other objects.

There’s no corresponding from_json_string() because to deserialize an object is normally done in the context of a Document (since the Document can resolve references).

For most purposes it’s best to serialize and deserialize entire documents.

Parameters: include_defaults (bool) – whether to include attributes that haven’t been changed from the default

trigger(attr: str, old: Unknown, new: Unknown, hint: DocumentPatchedEvent | None = None, setter: Setter | None = None) → None¶

unapply_theme() → None¶

Remove any themed values and restore defaults.

Returns: None

update(**kwargs: Any) → None¶

Updates the object’s properties from the given keyword arguments.

Returns: None

Examples

The following are equivalent:

from bokeh.models import Range1d

r = Range1d

# set properties individually:
r.start = 10
r.end = 20

# update properties together:
r.update(start=10, end=20)

update_from_json(json_attributes: Dict[str, JSON], *, models: Mapping[ID, HasProps] | None = None, setter: Setter | None = None) → None¶

Updates the object’s properties from a JSON attributes dictionary.

Parameters

json_attributes – (JSON-dict) : attributes and values to update
models (dict or None, optional) –
Mapping of model ids to models (default: None)

This is needed in cases where the attributes to update also have values that have references.
setter (ClientSession or ServerSession or None, optional) –
This is used to prevent “boomerang” updates to Bokeh apps.

In the context of a Bokeh server application, incoming updates to properties will be annotated with the session that is doing the updating. This value is propagated through any subsequent change notifications that the update triggers. The session can compare the event setter to itself, and suppress any updates that originate from itself.

Returns

None

property document: Document | None¶: The Document this model is attached to (can be None)

property struct: bokeh.core.types.ReferenceJson¶

A Bokeh protocol “structure” of this model, i.e. a dict of the form:

{
    'type' : << view model name >>
    'id'   : << unique model id >>
}

Additionally there may be a subtype field if this model is a subtype.

WidgetBox¶

class WidgetBox(*args, **kwargs)[source]¶

Bases: bokeh.models.layouts.Column

Create a column of bokeh widgets with predefined styling.

WidgetBox is DEPRECATED and will beremoved in Bokeh 3.0, use ‘Column’ instead.

JSON Prototype

{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "children": [],
  "css_classes": [],
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "18453",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    0,
    0,
    0,
    0
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "rows": "auto",
  "sizing_mode": null,
  "spacing": 0,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

Inherited from Column

rows

Describes how the component should maintain its rows' heights.

Inherited from Box

`children`	The list of children, which can be other components including plots, rows, columns, and widgets.
`spacing`	The gap between children (in pixels).

Inherited from LayoutDOM

`disabled`	Whether the widget will be disabled when rendered.
`visible`	Whether the component will be visible and a part of a layout.
`width`	The width of the component (in pixels).
`height`	The height of the component (in pixels).
`min_width`	Minimal width of the component (in pixels) if width is adjustable.
`min_height`	Minimal height of the component (in pixels) if height is adjustable.
`max_width`	Maximal width of the component (in pixels) if width is adjustable.
`max_height`	Maximal height of the component (in pixels) if height is adjustable.
`margin`	Allows to create additional space around the component.
`width_policy`	Describes how the component should maintain its width.
`height_policy`	Describes how the component should maintain its height.
`aspect_ratio`	Describes the proportional relationship between component's width and height.
`sizing_mode`	How the component should size itself.
`align`	The alignment point within the parent container.
`background`	Background color of the component.
`css_classes`	A list of CSS class names to add to this DOM element.

Inherited from Model

`model_class_reverse_map`
`id`
`ref`
`struct`	A Bokeh protocol "structure" of this model, i.e. a dict of the form:.
`name`	An arbitrary, user-supplied name for this model.
`tags`	An optional list of arbitrary, user-supplied values to attach to this model.
`js_event_callbacks`	A mapping of event names to lists of `CustomJS` callbacks.
`subscribed_events`	List of events that are subscribed to by Python callbacks.
`js_property_callbacks`	A mapping of attribute names to lists of `CustomJS` callbacks, to be set up on BokehJS side when the document is created.
`syncable`	Indicates whether this model should be synchronized back to a Bokeh server when updated in a web browser.

Inherited from HasDocumentRef

The Document this model is attached to (can be None)

Public Methods:

__init__(*args, **kw)

Inherited from Box

__init__(*args, **kw)

Inherited from Model

`__init_subclass__`()
`__new__`(cls, args, *kwargs)
`__init__`(args, *kw)
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`destroy`()	Clean up references to the document and property
`js_on_event`(event, *callbacks)
`js_link`(attr, other, other_attr[, attr_selector])	Link two Bokeh model properties using JavaScript.
`js_on_change`(event, *callbacks)	Attach a `CustomJS` callback to an arbitrary BokehJS model event.
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`references`()	Returns all `Models` that this object has references to.
`select`(selector)	Query this object and all of its references for objects that match the given selector.
`select_one`(selector)	Query this object and all of its references for objects that match the given selector.
`set_select`(selector, updates)	Update objects that match a given selector with the specified attribute/value updates.
`to_json`(include_defaults)	Returns a dictionary of the attributes of this object, containing only "JSON types" (string, number, boolean, none, dict, list).
`to_json_string`(include_defaults)	Returns a JSON string encoding the attributes of this object.
`trigger`(attr, old, new[, hint, setter])

Inherited from HasProps

`__init__`(args, *kw)
`__setattr__`(name, value)	Intercept attribute setting on HasProps in order to special case a few situations:
`__getattr__`(name)	Intercept attribute setting on HasProps in order to special case a few situations:
`__str__`()	Return str(self).
`__repr__`()	Return repr(self).
`equals`(other)	Structural equality of models.
`static_to_serializable`(serializer)
`to_serializable`(serializer)
`set_from_json`(name, json, *[, models, setter])	Set a property value on this object from JSON.
`update`(**kwargs)	Updates the object's properties from the given keyword arguments.
`update_from_json`(json_attributes, *[, ...])	Updates the object's properties from a JSON attributes dictionary.
`lookup`(name, *[, raises])	Find the `PropertyDescriptor` for a Bokeh property on a class, given the property name.
`properties`(*[, _with_props])	Collect the names of properties on this class.
`properties_with_refs`()	Collect the names of all properties on this class that also have references.
`dataspecs`()	Collect the names of all `DataSpec` properties on this class.
`properties_with_values`(*[, ...])	Collect a dict mapping property names to their values.
`query_properties_with_values`(query, *[, ...])	Query the properties values of `HasProps` instances with a predicate.
`themed_values`()	Get any theme-provided overrides.
`apply_theme`(property_values)	Apply a set of theme values which will be used rather than defaults, but will not override application-set values.
`unapply_theme`()	Remove any themed values and restore defaults.

Inherited from HasDocumentRef

__init__(*args, **kw)

Inherited from PropertyCallbackManager

`__init__`(args, *kw)
`on_change`(attr, *callbacks)	Add a callback on this object to trigger when `attr` changes.
`remove_on_change`(attr, *callbacks)	Remove a callback from this object
`trigger`(attr, old, new[, hint, setter])

Inherited from EventCallbackManager

`__init__`(args, *kw)
`on_event`(event, *callbacks)	Run callbacks when the specified event occurs on this Model

align = 'start'¶

Type: Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

The alignment point within the parent container.

This property is useful only if this component is a child element of a layout (e.g. a grid). Self alignment can be overridden by the parent container (e.g. grid track align).

aspect_ratio = None¶

Type: Either(Null, Auto, Float)

Describes the proportional relationship between component’s width and height.

background = None¶

Type: Nullable(Color)

Background color of the component.

children = []¶

Type: List

The list of children, which can be other components including plots, rows, columns, and widgets.

css_classes = []¶

Type: List

A list of CSS class names to add to this DOM element. Note: the class names are simply added as-is, no other guarantees are provided.

It is also permissible to assign from tuples, however these are adapted – the property will always contain a list.

disabled = False¶

Type: Bool

Whether the widget will be disabled when rendered.

If True, the widget will be greyed-out and not responsive to UI events.

height = None¶

Type: Nullable(NonNegativeInt)

The height of the component (in pixels).

This can be either fixed or preferred height, depending on height sizing policy.

height_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its height.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly height pixels. Component will overflow if it can’t fit in the available vertical space.
"fit": Use component’s preferred height (if set) and allow to fit into the available vertical space within the minimum and maximum height bounds (if set). Component’s height neither will be aggressively minimized nor maximized.
"min": Use as little vertical space as possible, not less than the minimum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much vertical space as possible, not more than the maximum height (if set). The starting point is the preferred height (if set). The height of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

margin = (0, 0, 0, 0)¶

Type: Nullable(Tuple(Int, Int, Int, Int))

max_height = None¶

Type: Nullable(NonNegativeInt)

Maximal height of the component (in pixels) if height is adjustable.

max_width = None¶

Type: Nullable(NonNegativeInt)

Maximal width of the component (in pixels) if width is adjustable.

min_height = None¶

Type: Nullable(NonNegativeInt)

Minimal height of the component (in pixels) if height is adjustable.

min_width = None¶

Type: Nullable(NonNegativeInt)

Minimal width of the component (in pixels) if width is adjustable.

name = None¶

Type: Nullable(String)

An arbitrary, user-supplied name for this model.

This name can be useful when querying the document to retrieve specific Bokeh models.

>>> plot.circle([1,2,3], [4,5,6], name="temp")
>>> plot.select(name="temp")
[GlyphRenderer(id='399d53f5-73e9-44d9-9527-544b761c7705', ...)]

Note

No uniqueness guarantees or other conditions are enforced on any names that are provided, nor is the name used directly by Bokeh for any reason.

rows = 'auto'¶

Type: Either(Either(Enum(Enumeration(auto, min, fit, max)), Int), Dict(Either(Int, String), Either(Either(Enum(Enumeration(auto, min, fit, max)), Int), Struct, Struct, Struct)))

Describes how the component should maintain its rows’ heights.

Note

This is an experimental feature and may change in future. Use it at your own discretion.

sizing_mode = None¶

Type: Nullable(Enum(SizingMode))

How the component should size itself.

Possible scenarios:

"fixed": Component is not responsive. It will retain its original width and height regardless of any subsequent browser window resize events.
"stretch_width": Component will responsively resize to stretch to the available width, without maintaining any aspect ratio. The height of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_height": Component will responsively resize to stretch to the available height, without maintaining any aspect ratio. The width of the component depends on the type of the component and may be fixed or fit to component’s contents.
"stretch_both": Component is completely responsive, independently in width and height, and will occupy all the available horizontal and vertical space, even if this changes the aspect ratio of the component.
"scale_width": Component will responsively resize to stretch to the available width, while maintaining the original or provided aspect ratio.
"scale_height": Component will responsively resize to stretch to the available height, while maintaining the original or provided aspect ratio.
"scale_both": Component will responsively resize to both the available width and height, while maintaining the original or provided aspect ratio.

spacing = 0¶

Type: Int

The gap between children (in pixels).

syncable = True¶

Type: Bool

Note

Setting this property to False will prevent any on_change() callbacks on this object from triggering. However, any JS-side callbacks will still work.

tags = []¶

Type: List

An optional list of arbitrary, user-supplied values to attach to this model.

This data can be useful when querying the document to retrieve specific Bokeh models:

>>> r = plot.circle([1,2,3], [4,5,6])
>>> r.tags = ["foo", 10]
>>> plot.select(tags=['foo', 10])
[GlyphRenderer(id='1de4c3df-a83d-480a-899b-fb263d3d5dd9', ...)]

Or simply a convenient way to attach any necessary metadata to a model that can be accessed by CustomJS callbacks, etc.

Note

No uniqueness guarantees or other conditions are enforced on any tags that are provided, nor are the tags used directly by Bokeh for any reason.

visible = True¶

Type: Bool

Whether the component will be visible and a part of a layout.

width = None¶

Type: Nullable(NonNegativeInt)

The width of the component (in pixels).

This can be either fixed or preferred width, depending on width sizing policy.

width_policy = 'auto'¶

Type: Either(Auto, Enum(SizingPolicy))

Describes how the component should maintain its width.

"auto": Use component’s preferred sizing policy.
"fixed": Use exactly width pixels. Component will overflow if it can’t fit in the available horizontal space.
"fit": Use component’s preferred width (if set) and allow it to fit into the available horizontal space within the minimum and maximum width bounds (if set). Component’s width neither will be aggressively minimized nor maximized.
"min": Use as little horizontal space as possible, not less than the minimum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.
"max": Use as much horizontal space as possible, not more than the maximum width (if set). The starting point is the preferred width (if set). The width of the component may shrink or grow depending on the parent layout, aspect management and other factors.

Note

This is an experimental feature and may change in future. Use it at your own discretion. Prefer using sizing_mode if this level of control isn’t strictly necessary.

apply_theme(property_values: Dict[str, Any]) → None¶

Apply a set of theme values which will be used rather than defaults, but will not override application-set values.

The passed-in dictionary may be kept around as-is and shared with other instances to save memory (so neither the caller nor the HasProps instance should modify it).

Parameters: property_values (dict) – theme values to use in place of defaults
Returns: None

classmethod dataspecs() → Dict[str, DataSpec]¶

Collect the names of all DataSpec properties on this class.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of DataSpec properties
Return type: set[str]

destroy() → None¶: Clean up references to the document and property

equals(other: bokeh.core.has_props.HasProps) → bool¶

Structural equality of models.

Parameters: other (HasProps) – the other instance to compare to
Returns: True, if properties are structurally equal, otherwise False

js_link(attr: str, other: Model, other_attr: str, attr_selector: int | str | None = None) → None¶

Link two Bokeh model properties using JavaScript.

This is a convenience method that simplifies adding a CustomJS callback to update one Bokeh model property whenever another changes value.

Parameters

attr (str) – The name of a Bokeh property on this model
other (Model) – A Bokeh model to link to self.attr
other_attr (str) – The property on other to link together
attr_selector (Union[int, str]) – The index to link an item in a subscriptable attr

Added in version 1.1

Raises: ValueError –

Examples

This code with js_link:

select.js_link('value', plot, 'sizing_mode')

is equivalent to the following:

from bokeh.models import CustomJS
select.js_on_change('value',
    CustomJS(args=dict(other=plot),
             code="other.sizing_mode = this.value"
    )
)

Additionally, to use attr_selector to attach the left side of a range slider to a plot’s x_range:

range_slider.js_link('value', plot.x_range, 'start', attr_selector=0)

which is equivalent to:

from bokeh.models import CustomJS
range_slider.js_on_change('value',
    CustomJS(args=dict(other=plot.x_range),
             code="other.start = this.value[0]"
    )
)

js_on_change(event: str, *callbacks: JSEventCallback) → None¶

Attach a CustomJS callback to an arbitrary BokehJS model event.

# these two are equivalent
source.js_on_change('data', callback)
source.js_on_change('change:data', callback)

source.js_on_change('streaming', callback)

classmethod lookup(name: str, *, raises: bool = True) → PropertyDescriptor[Any] | None¶

Find the PropertyDescriptor for a Bokeh property on a class, given the property name.

Parameters

name (str) – name of the property to search for
raises (bool) – whether to raise or return None if missing

Returns

descriptor for property named name

Return type

on_change(attr: str, *callbacks: PropertyCallback) → None¶

Add a callback on this object to trigger when attr changes.

Parameters

attr (str) – an attribute name on this object
*callbacks (callable) – callback functions to register

Returns

None

Example:

widget.on_change('value', callback1, callback2, ..., callback_n)

on_event(event: str | Type[Event], *callbacks: EventCallback) → None¶

Run callbacks when the specified event occurs on this Model

Not all Events are supported for all Models. See specific Events in bokeh.events for more information on which Models are able to trigger them.

classmethod properties(*, _with_props: bool = False) → Union[Set[str], Dict[str, Property[Any]]]¶

Collect the names of properties on this class.

Warning

In a future version of Bokeh, this method will return a dictionary mapping property names to property objects. To future-proof this current usage of this method, wrap the return value in list.

Returns: property names

classmethod properties_with_refs() → Dict[str, Property[Any]]¶

Collect the names of all properties on this class that also have references.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Returns: names of properties that have references
Return type: set[str]

properties_with_values(*, include_defaults: bool = True, include_undefined: bool = False) → Dict[str, Any]¶

Collect a dict mapping property names to their values.

This method always traverses the class hierarchy and includes properties defined on any parent classes.

Parameters: include_defaults (bool, optional) – Whether to include properties that haven’t been explicitly set since the object was created. (default: True)
Returns: mapping from property names to their values
Return type: dict

Query the properties values of HasProps instances with a predicate.

Parameters

query (callable) – A callable that accepts property descriptors and returns True or False
include_defaults (bool, optional) – Whether to include properties that have not been explicitly set by a user (default: True)

Returns

mapping of property names and values for matching properties

Return type