code: def display_element_selected(self, f):
          
          self._display_element_selected_func = f
  
          @wraps(f)
          def wrapper(*args, **kw):
              self._flask_view_func(*args, **kw)
          return f
docs: Decorator routes Alexa Display.ElementSelected request to the wrapped view function.
  
          @ask.display_element_selected
          def eval_element():
              return "", 200
  
          The wrapped function is registered as the display_element_selected view function
          and renders the response for requests.
  
          Arguments:
              f {function} -- display_element_selected view function