Getting values selected from dropdown menue only after click event?

I am using pattern matching code from page: here.

Code is:

@app.callback(
    Output('dropdown-container-output', 'children'),
    Input({'type': 'filter-dropdown', 'index': ALL}, 'value')
)
def display_output(values):
    return html.Div([
        html.Div('Dropdown {} = {}'.format(i + 1, value))
        for (i, value) in enumerate(values)
    ])

Here I am interested in this Input({'type': 'filter-dropdown', 'index': ALL}, 'value') but only when click event has occurred. Have tried multiple things but got no success. Any help will be greatly appreciated.

Thank You.

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