Referencing parents/childern

Anvil Q&A
2

It’s usually best to keep all knowledge of a Form’s structure within the Form itself, so if the Form structure changes, all the code that needs to change is within the Form.

This can usually be achieved with get_open_form().

In your case, you could create an event handler on the Form that knows how to update the Label:

# In the main Form
  def __init__(self, **properties):
    # ...
    self.set_event_handler('x-update-label', self.update_label)
    
  def update_label(self, new_text, **event_args):
    self.label_1.text = new_text

Then raise the event from the lost_focus event:

# In the Data Row Panel
  def text_box_1_lost_focus(self, **event_args):
    """This method is called when the TextBox loses focus"""
    get_open_form().raise_event('x-update-label', new_text=self.text_box_1.text)

So the Data Row Panel is responsible for the TextBox within it, and the Form is responsible for the Label.

3 Likes