panel.links module

Defines Links which allow declaring links between bokeh properties.

class panel.links.Callback(source: Reactive, target: JSLinkTarget | None = None, args: dict[str, Any] | None = None, code: dict[str, str] | None = None, **params)

Bases: Parameterized

A Callback defines some callback to be triggered when a property changes on the source object. A Callback can execute arbitrary Javascript code and will make all objects referenced in the args available in the JS namespace.

Attributes:

source

Methods

init()	Registers the Callback
register_callback(callback)	Register a LinkCallback providing the implementation for the Link for a particular backend.

Parameter Definitions

---

args = Dict(allow_None=True, class_=<class 'dict'>, default={}, label='Args')

A mapping of names to Python objects. These objects are made available to the callback’s code snippet as the values of named parameters to the callback.

code = Dict(allow_None=True, class_=<class 'dict'>, label='Code')

A dictionary mapping from a source specification to a JS code snippet to be executed if the source property changes.

init() → None

Registers the Callback

classmethod register_callback(callback: type[CallbackGenerator]) → None

Register a LinkCallback providing the implementation for the Link for a particular backend.

class panel.links.Link(source: Reactive, target: JSLinkTarget | None = None, **params)

Bases: Callback

A Link defines some connection between a source and target model. It allows defining callbacks in response to some change or event on the source object. Instead a Link directly causes some action to occur on the target, for JS based backends this usually means that a corresponding JS callback will effect some change on the target in response to a change on the source.

A Link must define a source object which is what triggers events, but must not define a target. It is also possible to define bi- directional links between the source and target object.

Attributes:

target

Methods

link()	Registers the Link
unlink()	Unregisters the Link

Parameter Definitions

---

Parameters inherited from:

panel.links.Callback: args, code

bidirectional = Boolean(default=False, label='Bidirectional')

Whether to link source and target in both directions.

properties = Dict(class_=<class 'dict'>, default={}, label='Properties')

A dictionary mapping between source specification to target specification.

link() → None

Registers the Link

unlink() → None

Unregisters the Link