add_callback: Add a callback to a Dash app
In daattali/dash2: Wrapper for Plotly's dash

add_callback

R Documentation

Add a callback to a Dash app

Dash apps are made interactive through callbacks; special functions that are automatically called whenever an input component's property changes.

add_callback(app, outputs, params, callback)

`app`	A dash application created with `dash_app()`.
`outputs`	An `output` or a list of `outputs` that will be updated by the callback.
`params`	An `input` or a list of `inputs` and `states` that will fire the callback.
`callback`	A function that takes the inputs and states as arguments and returns the outputs.