class Form.Element.Observer

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An Abstract.TimedObserver subclass 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 select boxes.)

Form.Element observer implements the getValue() method using Form.Element.getValue on the given element. See Abstract.TimedObserver for general documentation on timed observers.