Utilities for dealing with form controls in the DOM.
Note that nearly all these methods are available directly on
textarea elements. Therefore, these are equivalent:
Naturally, you should always prefer the shortest form suitable in a situation. Most of these methods also return the element itself (as indicated by the return type) for chainability.
Abstract.TimedObserversubclass that watches for changes to a form field's value. This triggers the callback when the form field's value (according to
Form.Element.getValue) changes. (Note that when the value actually changes can vary from browser to browser, particularly with