Create callback inside a callback?

Dash Python
1

Is it possible to register a new callback while a server is already running:

app = dash.Dash()
app.config.suppress_callback_exceptions = True

app.layout = html.Div(children=[
    html.Button(
        'Add',
        id='add_button',
    ),
    html.Div(id='content'),
])

@app.callback(
    output=Output(component_id='content', component_property='children'),
    inputs=[
        Input(component_id='add_button', component_property='n_clicks'),
    ],
)
def pushed(n):
    if n is None:
        return html.Div()
    content = html.Div(
        id=f'clicked_{n}',
        children=[
            html.Button(
                f'Button_{n}',
                id=f'button_{n}'
            ),
            html.Div(id=f'content_{n}')
        ],
    ),

    print(f'making callback {n}')
    @app.callback(
        output=Output(component_id=f'content_{n}', component_property='children'),
        inputs=[
            Input(component_id=f'button_{n}', component_property='n_clicks')
        ]
    )
    def button_press(nc):
        print(f'callback {n}')
        return f'button {n} pushed {nc} times'
    
    return content

I’ve seen differing information about this. The above code doesn’t work, behaving as though the dynamically created callbacks don’t exist.

2

It’s not, see Dynamic Controls and Dynamic Output Components