Fires on a databound object before updating the associated data in the data source object.
If the event bubbles and is cancellable, return VARIANT_TRUE to prevent the event from bubbling to other event handlers in the document tree. Return VARIANT_FALSE to allow bubbling.
The DISPID for this event is defined in mshtmdid.h. Use this value to identify the event handler when implementing IDispatch::Invoke.
Bubbles Yes Cancels Yes To invoke Cause an object to receive focus, change the value of the object, and either cause the object to lose focus or force the document to unload. Default action Signals that the data contained in an object has changed.
If the HTMLElementEvents::onbeforeupdate event is canceled, the HTMLElementEvents::onafterupdate event does not fire.