src code

constructor new Form.Element.Observer

new Form.Element.Observer(element, frequency, callback)
  • element (String | Element) – The form element to watch. Can be an element instance or an ID.
  • frequency (Number) – The frequency, in seconds — e.g., 0.33 to check for changes every third of a second.
  • callback (Function) – The callback to trigger when the value changes.

Creates a Form.Element.Observer.