bokeh.models.widgets.inputs

Various kinds of input widgets and form controls.

AutocompleteInput

class AutocompleteInput(*args, **kwargs)[source]

Bases: bokeh.models.widgets.inputs.TextInput

Single-line input widget with auto-completion.

JSON Prototype
{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "case_sensitive": true,
  "completions": [],
  "css_classes": [],
  "default_size": 300,
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "20143",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    5,
    5,
    5,
    5
  ],
  "max_height": null,
  "max_length": null,
  "max_width": null,
  "min_characters": 2,
  "min_height": null,
  "min_width": null,
  "name": null,
  "placeholder": "",
  "restrict": true,
  "sizing_mode": null,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "title": "",
  "value": "",
  "value_input": "",
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

completions

A list of completion strings.

min_characters

The number of characters a user must type before completions are presented.

case_sensitive

Enable or disable case sensitivity

restrict

Set to False in order to allow users to enter text that is not present in the list of completion strings.

Inherited from TextLikeInput

value

Initial or entered text value.

value_input

Initial or current value.

placeholder

Placeholder for empty input field.

max_length

Max count of characters in field

Inherited from InputWidget

title

Widget’s label.

Inherited from Widget

default_size

The default size (width or height) in the dominating dimension.

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

document

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

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.

Public Methods:

Inherited from InputWidget

coerce_value(val)

Inherited from Model

__init_subclass__()

This method is called when a class is subclassed.

__new__(cls, *args, **kwargs)

Create and return a new object.

__init__(**kwargs)

__str__()

Return str(self).

__repr__()

Return str(self).

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.

layout(side, plot)

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 str(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 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
Property type

Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

Default value

'start'

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
Property type

Either(Null, Auto, Float)

Default value

None

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
Property type

Nullable(Color)

Default value

None

Background color of the component.

case_sensitive
Property type

Bool

Default value

True

Enable or disable case sensitivity

completions
Property type

List

Default value

[]

A list of completion strings. This will be used to guide the user upon typing the beginning of a desired value.

css_classes
Property type

List

Default value

[]

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.

default_size
Property type

Int

Default value

300

The default size (width or height) in the dominating dimension.

The dominating dimension is determined by widget orientation.

disabled
Property type

Bool

Default value

False

Whether the widget will be disabled when rendered.

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

height
Property type

Nullable(NonNegativeInt)

Default value

None

The height of the component (in pixels).

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

height_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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.

js_event_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of event names to lists of CustomJS callbacks.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_event method:

callback = CustomJS(code="console.log('tap event occurred')")
plot.js_on_event('tap', callback)
js_property_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of attribute names to lists of CustomJS callbacks, to be set up on BokehJS side when the document is created.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_change method:

callback = CustomJS(code="console.log('stuff')")
plot.x_range.js_on_change('start', callback)
margin
Property type

Nullable(Tuple(Int, Int, Int, Int))

Default value

(5, 5, 5, 5)

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
Property type

Nullable(NonNegativeInt)

Default value

None

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

max_length
Property type

Nullable(Int)

Default value

None

Max count of characters in field

max_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_characters
Property type

PositiveInt

Default value

2

The number of characters a user must type before completions are presented.

min_height
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

name
Property type

Nullable(String)

Default value

None

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.

placeholder
Property type

String

Default value

''

Placeholder for empty input field.

restrict
Property type

Bool

Default value

True

Set to False in order to allow users to enter text that is not present in the list of completion strings.

sizing_mode
Property type

Nullable(Enum(SizingMode))

Default value

None

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.

subscribed_events
Property type

List

Default value

[]

List of events that are subscribed to by Python callbacks. This is the set of events that will be communicated from BokehJS back to Python for this model.

syncable
Property type

Bool

Default value

True

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
Property type

List

Default value

[]

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
Property type

String

Default value

''

Widget’s label.

value
Property type

String

Default value

''

Initial or entered text value.

Change events are triggered whenever <enter> is pressed.

value_input
Property type

String

Default value

''

Initial or current value.

Change events are triggered whenever any update happens, i.e. on every keypress.

visible
Property type

Bool

Default value

True

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

width
Property type

Nullable(NonNegativeInt)

Default value

None

The width of the component (in pixels).

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

width_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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]

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

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)
layout(side, plot)
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

PropertyDescriptor

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

dict

references()Set[bokeh.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: Dict[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

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

property struct

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.

ColorPicker

class ColorPicker(*args, **kwargs)[source]

Bases: bokeh.models.widgets.inputs.InputWidget

Color picker widget

Warning

This widget as a limited support on Internet Explorer (it will be displayed as a simple text input).

JSON Prototype
{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "color": "#000000",
  "css_classes": [],
  "default_size": 300,
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "20176",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    5,
    5,
    5,
    5
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "sizing_mode": null,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "title": "",
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

color

The initial color of the picked color (named or hexadecimal)

Inherited from InputWidget

title

Widget’s label.

Inherited from Widget

default_size

The default size (width or height) in the dominating dimension.

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

document

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

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.

Public Methods:

Inherited from InputWidget

coerce_value(val)

Inherited from Model

__init_subclass__()

This method is called when a class is subclassed.

__new__(cls, *args, **kwargs)

Create and return a new object.

__init__(**kwargs)

__str__()

Return str(self).

__repr__()

Return str(self).

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.

layout(side, plot)

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 str(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 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
Property type

Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

Default value

'start'

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
Property type

Either(Null, Auto, Float)

Default value

None

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
Property type

Nullable(Color)

Default value

None

Background color of the component.

color
Property type

ColorHex

Default value

'#000000'

The initial color of the picked color (named or hexadecimal)

Acceptable values are:

  • any of the named CSS colors, e.g 'green', 'indigo'

  • RGB(A) hex strings, e.g., '#FF0000', '#44444444'

  • CSS4 color strings, e.g., 'rgba(255, 0, 127, 0.6)', 'rgb(0 127 0 / 1.0)', or 'hsl(60deg 100% 50% / 1.0)'

  • a 3-tuple of integers (r, g, b) between 0 and 255

  • a 4-tuple of (r, g, b, a) where r, g, b are integers between 0 and 255, and a is between 0 and 1

  • a 32-bit unsigned integer using the 0xRRGGBBAA byte order pattern

css_classes
Property type

List

Default value

[]

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.

default_size
Property type

Int

Default value

300

The default size (width or height) in the dominating dimension.

The dominating dimension is determined by widget orientation.

disabled
Property type

Bool

Default value

False

Whether the widget will be disabled when rendered.

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

height
Property type

Nullable(NonNegativeInt)

Default value

None

The height of the component (in pixels).

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

height_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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.

js_event_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of event names to lists of CustomJS callbacks.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_event method:

callback = CustomJS(code="console.log('tap event occurred')")
plot.js_on_event('tap', callback)
js_property_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of attribute names to lists of CustomJS callbacks, to be set up on BokehJS side when the document is created.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_change method:

callback = CustomJS(code="console.log('stuff')")
plot.x_range.js_on_change('start', callback)
margin
Property type

Nullable(Tuple(Int, Int, Int, Int))

Default value

(5, 5, 5, 5)

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
Property type

Nullable(NonNegativeInt)

Default value

None

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

max_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_height
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

name
Property type

Nullable(String)

Default value

None

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
Property type

Nullable(Enum(SizingMode))

Default value

None

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.

subscribed_events
Property type

List

Default value

[]

List of events that are subscribed to by Python callbacks. This is the set of events that will be communicated from BokehJS back to Python for this model.

syncable
Property type

Bool

Default value

True

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
Property type

List

Default value

[]

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
Property type

String

Default value

''

Widget’s label.

visible
Property type

Bool

Default value

True

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

width
Property type

Nullable(NonNegativeInt)

Default value

None

The width of the component (in pixels).

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

width_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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]

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

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)
layout(side, plot)
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

PropertyDescriptor

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

dict

references()Set[bokeh.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: Dict[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

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

property struct

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.

DatePicker

class DatePicker(*args, **kwargs)[source]

Bases: bokeh.models.widgets.inputs.InputWidget

Calendar-based date picker widget.

JSON Prototype
{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "css_classes": [],
  "default_size": 300,
  "disabled": false,
  "disabled_dates": [],
  "enabled_dates": [],
  "height": null,
  "height_policy": "auto",
  "id": "20202",
  "inline": false,
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    5,
    5,
    5,
    5
  ],
  "max_date": null,
  "max_height": null,
  "max_width": null,
  "min_date": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "position": "auto",
  "sizing_mode": null,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "title": "",
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

value

The initial or picked date.

min_date

Optional earliest allowable date.

max_date

Optional latest allowable date.

disabled_dates

A list of dates of (start, end) date ranges to make unavailable for selection.

enabled_dates

A list of dates of (start, end) date ranges to make available for selection.

position

Where the calendar is rendered relative to the input when inline is False.

inline

Whether the calendar sholud be displayed inline.

Inherited from InputWidget

title

Widget’s label.

Inherited from Widget

default_size

The default size (width or height) in the dominating dimension.

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

document

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

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.

Public Methods:

Inherited from InputWidget

coerce_value(val)

Inherited from Model

__init_subclass__()

This method is called when a class is subclassed.

__new__(cls, *args, **kwargs)

Create and return a new object.

__init__(**kwargs)

__str__()

Return str(self).

__repr__()

Return str(self).

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.

layout(side, plot)

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 str(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 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
Property type

Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

Default value

'start'

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
Property type

Either(Null, Auto, Float)

Default value

None

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
Property type

Nullable(Color)

Default value

None

Background color of the component.

css_classes
Property type

List

Default value

[]

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.

default_size
Property type

Int

Default value

300

The default size (width or height) in the dominating dimension.

The dominating dimension is determined by widget orientation.

disabled
Property type

Bool

Default value

False

Whether the widget will be disabled when rendered.

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

disabled_dates
Property type

List

Default value

[]

A list of dates of (start, end) date ranges to make unavailable for selection. All other dates will be avalable.

Note

Only one of disabled_dates and enabled_dates should be specified.

enabled_dates
Property type

List

Default value

[]

A list of dates of (start, end) date ranges to make available for selection. All other dates will be unavailable.

Note

Only one of disabled_dates and enabled_dates should be specified.

height
Property type

Nullable(NonNegativeInt)

Default value

None

The height of the component (in pixels).

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

height_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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.

inline
Property type

Bool

Default value

False

Whether the calendar sholud be displayed inline.

js_event_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of event names to lists of CustomJS callbacks.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_event method:

callback = CustomJS(code="console.log('tap event occurred')")
plot.js_on_event('tap', callback)
js_property_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of attribute names to lists of CustomJS callbacks, to be set up on BokehJS side when the document is created.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_change method:

callback = CustomJS(code="console.log('stuff')")
plot.x_range.js_on_change('start', callback)
margin
Property type

Nullable(Tuple(Int, Int, Int, Int))

Default value

(5, 5, 5, 5)

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_date
Property type

Nullable(Date)

Default value

None

Optional latest allowable date.

max_height
Property type

Nullable(NonNegativeInt)

Default value

None

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

max_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_date
Property type

Nullable(Date)

Default value

None

Optional earliest allowable date.

min_height
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

name
Property type

Nullable(String)

Default value

None

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.

position
Property type

Enum(CalendarPosition)

Default value

'auto'

Where the calendar is rendered relative to the input when inline is False.

sizing_mode
Property type

Nullable(Enum(SizingMode))

Default value

None

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.

subscribed_events
Property type

List

Default value

[]

List of events that are subscribed to by Python callbacks. This is the set of events that will be communicated from BokehJS back to Python for this model.

syncable
Property type

Bool

Default value

True

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
Property type

List

Default value

[]

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
Property type

String

Default value

''

Widget’s label.

value
Property type

Date

Default value

Undefined

The initial or picked date.

visible
Property type

Bool

Default value

True

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

width
Property type

Nullable(NonNegativeInt)

Default value

None

The width of the component (in pixels).

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

width_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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]

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

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)
layout(side, plot)
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

PropertyDescriptor

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

dict

references()Set[bokeh.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: Dict[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

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

property struct

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.

FileInput

class FileInput(*args, **kwargs)[source]

Bases: bokeh.models.widgets.widget.Widget

Present a file-chooser dialog to users and return the contents of the selected files.

JSON Prototype
{
  "accept": "",
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "css_classes": [],
  "default_size": 300,
  "disabled": false,
  "filename": "",
  "height": null,
  "height_policy": "auto",
  "id": "20234",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    5,
    5,
    5,
    5
  ],
  "max_height": null,
  "max_width": null,
  "mime_type": "",
  "min_height": null,
  "min_width": null,
  "multiple": false,
  "name": null,
  "sizing_mode": null,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "value": "",
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

value

The base64-enconded contents of the file or files that were loaded.

mime_type

The mime-type of the file or files that were loaded.

filename

The name(s) of the file or files that were loaded.

accept

Comma-separated list of standard HTML file input filters that restrict what files the user can pick from.

multiple

set multiple=False (default) for single file selection, set multiple=True if selection of more than one file at a time should be possible.

Inherited from Widget

default_size

The default size (width or height) in the dominating dimension.

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

document

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

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.

Public Methods:

Inherited from Model

__init_subclass__()

This method is called when a class is subclassed.

__new__(cls, *args, **kwargs)

Create and return a new object.

__init__(**kwargs)

__str__()

Return str(self).

__repr__()

Return str(self).

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.

layout(side, plot)

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 str(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 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


accept
Property type

String

Default value

''

Comma-separated list of standard HTML file input filters that restrict what files the user can pick from. Values can be:

<file extension>:

Specific file extension(s) (e.g: .gif, .jpg, .png, .doc) are pickable

audio/*:

all sound files are pickable

video/*:

all video files are pickable

image/*:

all image files are pickable

<media type>:

A valid IANA Media Type, with no parameters.

Note

A bug in some versions of Chrome on macOS Big Sur may limit how you can set a file input filter for those users. In those cases, it is impossible to limit the user’s selection to specific file extensions - instead, the browser will limit users to predefined sets of file types, such as Text/* or Image/*. See #10888 for more information.

align
Property type

Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

Default value

'start'

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
Property type

Either(Null, Auto, Float)

Default value

None

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
Property type

Nullable(Color)

Default value

None

Background color of the component.

css_classes
Property type

List

Default value

[]

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.

default_size
Property type

Int

Default value

300

The default size (width or height) in the dominating dimension.

The dominating dimension is determined by widget orientation.

disabled
Property type

Bool

Default value

False

Whether the widget will be disabled when rendered.

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

filename
Property type

Readonly

Default value

''

The name(s) of the file or files that were loaded.

If mulitiple is set to False (default), this value is a single string with the name of the single file that was chosen.

If multiple is True, this value is a list of strings, each containing the name of one of the multiple files that were chosen.

This list provides the sequence of files for the respective lists in value and mime-type

Note

The full file path is not included since browsers will not provide access to that information for security reasons.

height
Property type

Nullable(NonNegativeInt)

Default value

None

The height of the component (in pixels).

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

height_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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.

js_event_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of event names to lists of CustomJS callbacks.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_event method:

callback = CustomJS(code="console.log('tap event occurred')")
plot.js_on_event('tap', callback)
js_property_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of attribute names to lists of CustomJS callbacks, to be set up on BokehJS side when the document is created.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_change method:

callback = CustomJS(code="console.log('stuff')")
plot.x_range.js_on_change('start', callback)
margin
Property type

Nullable(Tuple(Int, Int, Int, Int))

Default value

(5, 5, 5, 5)

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
Property type

Nullable(NonNegativeInt)

Default value

None

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

max_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

mime_type
Property type

Readonly

Default value

''

The mime-type of the file or files that were loaded.

If mulitiple is set to False (default), this value is a single string with the mime-type of the single file that was chosen.

If multiple is True, this value is a list of strings, each containing the mime-type of one of the multiple files that were chosen.

The sequence of files is given by the list of filename (see below)

min_height
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

multiple
Property type

Bool

Default value

False

set multiple=False (default) for single file selection, set multiple=True if selection of more than one file at a time should be possible.

name
Property type

Nullable(String)

Default value

None

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
Property type

Nullable(Enum(SizingMode))

Default value

None

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.

subscribed_events
Property type

List

Default value

[]

List of events that are subscribed to by Python callbacks. This is the set of events that will be communicated from BokehJS back to Python for this model.

syncable
Property type

Bool

Default value

True

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
Property type

List

Default value

[]

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.

value
Property type

Readonly

Default value

''

The base64-enconded contents of the file or files that were loaded.

If mulitiple is set to False (default), this value is a single string with the contents of the single file that was chosen.

If multiple is True, this value is a list of strings, each containing the contents of one of the multiple files that were chosen.

The sequence of files is given by the list of filenames (see below)

visible
Property type

Bool

Default value

True

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

width
Property type

Nullable(NonNegativeInt)

Default value

None

The width of the component (in pixels).

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

width_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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]

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

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)
layout(side, plot)
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

PropertyDescriptor

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

dict

references()Set[bokeh.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: Dict[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

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

property struct

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.

InputWidget

class InputWidget(*args, **kwargs)[source]

Bases: bokeh.models.widgets.widget.Widget

Abstract base class for input widgets.

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": [],
  "default_size": 300,
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "20263",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    5,
    5,
    5,
    5
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "sizing_mode": null,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "title": "",
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

title

Widget’s label.

Inherited from Widget

default_size

The default size (width or height) in the dominating dimension.

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

document

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

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.

Public Methods:

coerce_value(val)

Inherited from Model

__init_subclass__()

This method is called when a class is subclassed.

__new__(cls, *args, **kwargs)

Create and return a new object.

__init__(**kwargs)

__str__()

Return str(self).

__repr__()

Return str(self).

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.

layout(side, plot)

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 str(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 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
Property type

Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

Default value

'start'

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
Property type

Either(Null, Auto, Float)

Default value

None

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
Property type

Nullable(Color)

Default value

None

Background color of the component.

css_classes
Property type

List

Default value

[]

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.

default_size
Property type

Int

Default value

300

The default size (width or height) in the dominating dimension.

The dominating dimension is determined by widget orientation.

disabled
Property type

Bool

Default value

False

Whether the widget will be disabled when rendered.

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

height
Property type

Nullable(NonNegativeInt)

Default value

None

The height of the component (in pixels).

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

height_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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.

js_event_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of event names to lists of CustomJS callbacks.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_event method:

callback = CustomJS(code="console.log('tap event occurred')")
plot.js_on_event('tap', callback)
js_property_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of attribute names to lists of CustomJS callbacks, to be set up on BokehJS side when the document is created.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_change method:

callback = CustomJS(code="console.log('stuff')")
plot.x_range.js_on_change('start', callback)
margin
Property type

Nullable(Tuple(Int, Int, Int, Int))

Default value

(5, 5, 5, 5)

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
Property type

Nullable(NonNegativeInt)

Default value

None

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

max_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_height
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

name
Property type

Nullable(String)

Default value

None

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
Property type

Nullable(Enum(SizingMode))

Default value

None

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.

subscribed_events
Property type

List

Default value

[]

List of events that are subscribed to by Python callbacks. This is the set of events that will be communicated from BokehJS back to Python for this model.

syncable
Property type

Bool

Default value

True

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
Property type

List

Default value

[]

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
Property type

String

Default value

''

Widget’s label.

visible
Property type

Bool

Default value

True

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

width
Property type

Nullable(NonNegativeInt)

Default value

None

The width of the component (in pixels).

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

width_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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]

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

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)
layout(side, plot)
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

PropertyDescriptor

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

dict

references()Set[bokeh.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: Dict[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

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

property struct

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.

MultiChoice

class MultiChoice(*args, **kwargs)[source]

Bases: bokeh.models.widgets.inputs.InputWidget

MultiChoice widget.

JSON Prototype
{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "css_classes": [],
  "default_size": 300,
  "delete_button": true,
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "20288",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    5,
    5,
    5,
    5
  ],
  "max_height": null,
  "max_items": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "option_limit": null,
  "options": [],
  "placeholder": null,
  "sizing_mode": null,
  "solid": true,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "title": "",
  "value": [],
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

options

Available selection options.

value

Initial or selected values.

delete_button

Whether to add a button to remove a selected option.

max_items

The maximum number of items that can be selected.

option_limit

The number of choices that will be rendered in the dropdown.

placeholder

A string that is displayed if not item is added.

solid

Specify whether the choices should be solidly filled.

Inherited from InputWidget

title

Widget’s label.

Inherited from Widget

default_size

The default size (width or height) in the dominating dimension.

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

document

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

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.

Public Methods:

Inherited from InputWidget

coerce_value(val)

Inherited from Model

__init_subclass__()

This method is called when a class is subclassed.

__new__(cls, *args, **kwargs)

Create and return a new object.

__init__(**kwargs)

__str__()

Return str(self).

__repr__()

Return str(self).

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.

layout(side, plot)

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 str(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 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
Property type

Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

Default value

'start'

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
Property type

Either(Null, Auto, Float)

Default value

None

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
Property type

Nullable(Color)

Default value

None

Background color of the component.

css_classes
Property type

List

Default value

[]

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.

default_size
Property type

Int

Default value

300

The default size (width or height) in the dominating dimension.

The dominating dimension is determined by widget orientation.

delete_button
Property type

Bool

Default value

True

Whether to add a button to remove a selected option.

disabled
Property type

Bool

Default value

False

Whether the widget will be disabled when rendered.

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

height
Property type

Nullable(NonNegativeInt)

Default value

None

The height of the component (in pixels).

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

height_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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.

js_event_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of event names to lists of CustomJS callbacks.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_event method:

callback = CustomJS(code="console.log('tap event occurred')")
plot.js_on_event('tap', callback)
js_property_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of attribute names to lists of CustomJS callbacks, to be set up on BokehJS side when the document is created.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_change method:

callback = CustomJS(code="console.log('stuff')")
plot.x_range.js_on_change('start', callback)
margin
Property type

Nullable(Tuple(Int, Int, Int, Int))

Default value

(5, 5, 5, 5)

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
Property type

Nullable(NonNegativeInt)

Default value

None

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

max_items
Property type

Nullable(Int)

Default value

None

The maximum number of items that can be selected.

max_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_height
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

name
Property type

Nullable(String)

Default value

None

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.

option_limit
Property type

Nullable(Int)

Default value

None

The number of choices that will be rendered in the dropdown.

options
Property type

List

Default value

[]

Available selection options. Options may be provided either as a list of possible string values, or as a list of tuples, each of the form (value, label). In the latter case, the visible widget text for each value will be corresponding given label.

placeholder
Property type

Nullable(String)

Default value

None

A string that is displayed if not item is added.

sizing_mode
Property type

Nullable(Enum(SizingMode))

Default value

None

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.

solid
Property type

Bool

Default value

True

Specify whether the choices should be solidly filled.

subscribed_events
Property type

List

Default value

[]

List of events that are subscribed to by Python callbacks. This is the set of events that will be communicated from BokehJS back to Python for this model.

syncable
Property type

Bool

Default value

True

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
Property type

List

Default value

[]

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
Property type

String

Default value

''

Widget’s label.

value
Property type

List

Default value

[]

Initial or selected values.

visible
Property type

Bool

Default value

True

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

width
Property type

Nullable(NonNegativeInt)

Default value

None

The width of the component (in pixels).

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

width_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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]

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

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)
layout(side, plot)
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

PropertyDescriptor

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

dict

references()Set[bokeh.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: Dict[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

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

property struct

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.

MultiSelect

class MultiSelect(*args, **kwargs)[source]

Bases: bokeh.models.widgets.inputs.InputWidget

Multi-select widget.

JSON Prototype
{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "css_classes": [],
  "default_size": 300,
  "disabled": false,
  "height": null,
  "height_policy": "auto",
  "id": "20320",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "margin": [
    5,
    5,
    5,
    5
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "name": null,
  "options": [],
  "size": 4,
  "sizing_mode": null,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "title": "",
  "value": [],
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

options

Available selection options.

value

Initial or selected values.

size

The number of visible options in the dropdown list.

Inherited from InputWidget

title

Widget’s label.

Inherited from Widget

default_size

The default size (width or height) in the dominating dimension.

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

document

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

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.

Public Methods:

Inherited from InputWidget

coerce_value(val)

Inherited from Model

__init_subclass__()

This method is called when a class is subclassed.

__new__(cls, *args, **kwargs)

Create and return a new object.

__init__(**kwargs)

__str__()

Return str(self).

__repr__()

Return str(self).

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.

layout(side, plot)

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 str(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 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
Property type

Either(Enum(Align), Tuple(Enum(Align), Enum(Align)))

Default value

'start'

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
Property type

Either(Null, Auto, Float)

Default value

None

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
Property type

Nullable(Color)

Default value

None

Background color of the component.

css_classes
Property type

List

Default value

[]

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.

default_size
Property type

Int

Default value

300

The default size (width or height) in the dominating dimension.

The dominating dimension is determined by widget orientation.

disabled
Property type

Bool

Default value

False

Whether the widget will be disabled when rendered.

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

height
Property type

Nullable(NonNegativeInt)

Default value

None

The height of the component (in pixels).

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

height_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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.

js_event_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of event names to lists of CustomJS callbacks.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_event method:

callback = CustomJS(code="console.log('tap event occurred')")
plot.js_on_event('tap', callback)
js_property_callbacks
Property type

Dict(String, List)

Default value

{}

A mapping of attribute names to lists of CustomJS callbacks, to be set up on BokehJS side when the document is created.

Typically, rather then modifying this property directly, callbacks should be added using the Model.js_on_change method:

callback = CustomJS(code="console.log('stuff')")
plot.x_range.js_on_change('start', callback)
margin
Property type

Nullable(Tuple(Int, Int, Int, Int))

Default value

(5, 5, 5, 5)

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
Property type

Nullable(NonNegativeInt)

Default value

None

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

max_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_height
Property type

Nullable(NonNegativeInt)

Default value

None

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

min_width
Property type

Nullable(NonNegativeInt)

Default value

None

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

name
Property type

Nullable(String)

Default value

None

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.

options
Property type

List

Default value

[]

Available selection options. Options may be provided either as a list of possible string values, or as a list of tuples, each of the form (value, label). In the latter case, the visible widget text for each value will be corresponding given label.

size
Property type

Int

Default value

4

The number of visible options in the dropdown list. (This uses the select HTML element’s size attribute. Some browsers might not show less than 3 options.)

sizing_mode
Property type

Nullable(Enum(SizingMode))

Default value

None

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.

subscribed_events
Property type

List

Default value

[]

List of events that are subscribed to by Python callbacks. This is the set of events that will be communicated from BokehJS back to Python for this model.

syncable
Property type

Bool

Default value

True

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
Property type

List

Default value

[]

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
Property type

String

Default value

''

Widget’s label.

value
Property type

List

Default value

[]

Initial or selected values.

visible
Property type

Bool

Default value

True

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

width
Property type

Nullable(NonNegativeInt)

Default value

None

The width of the component (in pixels).

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

width_policy
Property type

Either(Auto, Enum(SizingPolicy))

Default value

'auto'

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]

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

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)
layout(side, plot)
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

PropertyDescriptor

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

dict

references()Set[bokeh.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: Dict[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

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

property struct

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.

NumericInput

class NumericInput(*args, **kwargs)[source]

Bases: bokeh.models.widgets.inputs.InputWidget

Numeric input widget.

JSON Prototype
{
  "align": "start",
  "aspect_ratio": null,
  "background": null,
  "css_classes": [],
  "default_size": 300,
  "disabled": false,
  "format": null,
  "height": null,
  "height_policy": "auto",
  "high": null,
  "id": "20348",
  "js_event_callbacks": {},
  "js_property_callbacks": {},
  "low": null,
  "margin": [
    5,
    5,
    5,
    5
  ],
  "max_height": null,
  "max_width": null,
  "min_height": null,
  "min_width": null,
  "mode": "int",
  "name": null,
  "placeholder": "",
  "sizing_mode": null,
  "subscribed_events": [],
  "syncable": true,
  "tags": [],
  "title": "",
  "value": null,
  "visible": true,
  "width": null,
  "width_policy": "auto"
}

Public Data Attributes:

value

Initial or entered value.

low

Optional lowest allowable value.

high

Optional highest allowable value.

placeholder

Placeholder for empty input field.

mode

Define the type of number which can be enter in the input

format

Inherited from InputWidget

title

Widget’s label.

Inherited from Widget

default_size

The default size (width or height) in the dominating dimension.

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

document

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

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.

Public Methods:

Inherited from