add_callback: Add a callback to a Dash app
In dash: An Interface to the Dash Ecosystem for Authoring Reactive Web Applications

add_callback

R Documentation

Add a callback to a Dash app

Add a callback to a Dash app

add_callback(app, outputs, params, callback)

`app`	A dash application created with `dash_app()`.
`outputs`	Unnamed list. The `output` argument provides the component `id` and `property` which will be updated by the callback; a callback can target one or more outputs (i.e. multiple outputs).
`params`	Unnamed list; provides input and state statements, each with its own defined `id` and `property`. For pattern-matching callbacks, the `id` field of a component is written in JSON-like syntax and provides fields that are arbitrary keys which describe the targets of the callback. See selectors for more details.
`callback`	Function; must return output provided input or state arguments. `callback` may be any valid R function, or a character string containing valid JavaScript, or a call to clientsideFunction, including `namespace` and `function_name` arguments for a locally served JavaScript function.