The field where the change occurred.
Returns whether the field was changed when setting a control's default value.
Returns whether the field was previously unmasked, and is now masked after the field value was updated.
Returns whether the field was previously masked, and is now masked after the field value was updated.
The field values before and after the change. The new and old parameters are optional.
Returns whether the change of the field value caused an unmask, as distinct from an unmask() call.