args is a dictionary with the following keys:

  • fill_dict - The fill dictionary. Key/value pairs.
  • fill_source - None, BrowserDatabag, PreviousFormState, RecipientDatabag, or QueryString.

This callback is called after the form has completed rendering but before it is filled allowing you to intercept and alter the values which are pre-filled on the form.

Note: In order for this callback to work properly, you must return the args dictionary with your modified form_definition.