[Feature Request] Add outputs and outputs_list to window.dash_clientside.callback_context

[CNFeffery]

For dash's client-side callbacks, adding outputs and outputs_list for window.dash_clientside.callback_context will improve operational freedom in many scenarios. Currently, only the following information can be obtained in the client-side callbacks:

import dash
from dash import html
from dash.dependencies import Input, Output

app = dash.Dash(__name__)

app.layout = html.Div(
    [html.Button("trigger", id="trigger-demo"), html.Pre(id="output-demo")],
    style={"padding": 50},
)

app.clientside_callback(
    """(n_clicks) => {
        return JSON.stringify(Object.keys(window.dash_clientside.callback_context));
    }""",
    Output("output-demo", "children"),
    Input("trigger-demo", "n_clicks"),
    prevent_initial_call=True,
)

if __name__ == '__main__':
    app.run(debug=True)

[T4rk1n]

The new fields can be added here:

dash/dash/dash-renderer/src/actions/callbacks.ts

Line 271 in 09252f8

dc.callback_context.states = stateDict;

The data is available in payload.