How can the execution of callbacks be avoided for components added dynamically in Plotly Dash?

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One way to avoid the execution of callbacks for components added dynamically in Plotly Dash is by using the dash.dependencies.PreventUpdate exception.

This exception can be raised when the callback is triggered but there is no actual change in the output. This can occur when a component is being added dynamically and the callback is triggered before the component has been fully loaded.

To use this exception, import it from dash.exceptions and add it as a return value for the callback that should not be executed when the component is still loading.

For example:

import dash
from dash.dependencies import Input, Output
from dash.exceptions import PreventUpdate
import dash_html_components as html

app = dash.Dash()

app.layout = html.Div(id='dynamic-div')

@app.callback(
    Output('dynamic-div', 'children'),
    [Input('my-button', 'n_clicks')]
)
def add_component(n_clicks):
    if n_clicks is None:
        raise PreventUpdate
    else:
        # Code to add new component dynamically here

In this example, the add_component callback will raise PreventUpdate if the my-button button has not been clicked. This allows the component to be added dynamically before the callback is executed.