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Assigns a delegate to the beforeUpdate event.
Syntax
public final void addOnBeforeUpdate( EventHandler h )
Parameters
h
The EventHandler delegate to be notified when the event occurs.
Remarks
The beforeUpdate event is triggered before the transfer of data from the element to the data provider. It is also triggered when an element loses focus or the element is attempting to unload when its value has changed from when it received focus.
See Also removeOnBeforeUpdate