Cannot disable button after clicking it, or dynamically set dcc.Dropdown() value

@msandula wrote:

I have the following elements: A dcc.Dropdown(), a dcc.Textarea() for comments, and a “Save” button.

On page load, the dropdown is set to a previously saved value; the comments field is empty and the comments field and “Save” button are disabled.

If you change the dropdown value, the comments field and “Save” button are enabled (this works).

You can then “Save” your updated value (the comments field is optional if you wish to record why you changed the dropdown value).

When you “Save”, it should clear the comments field and set the comments field and “Save” button to disabled (essentially, restore the page-load state, with the only difference being that the dropdown value has changed). But this is not working.

Can anyone help me identify why I can’t correctly reset my UI state after hitting “Save”?

Here’s a boiled down version of my callback:

@app.callback(

  [Output('comments-textarea', 'value'), Output('comments-textarea', 'disabled'), Output('save-button', 'disabled')],

  [Input('some-dropdown', 'value'), Input('save-button', 'n_clicks')],

  [State('comments-textarea', 'value')]

)

def update_data(dd_value, save_btn_clicks, comments_value):

  ctx = dash.callback_context

  if not ctx.triggered:

    raise PreventUpdate

  

  # Save button was clicked

  if ctx.triggered[0]['prop_id'] == 'save-button.n_clicks':

    do_something_with_data(dd_value, comments_value)

    return '', True, True

  else:

    return comments_value, False, False

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