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Flash Player 6.0.79.
Flash MX 2004.
Usage 1:
on(unload){
...
}
Usage 2:
listenerObject= new Object();listenerObject.unload = function(eventObject){...}componentInstance.addEventListener("unload",listenerObject)
Event; notifies listeners that the subobjects of this object are being unloaded.
The first usage example uses an on() handler and must be attached directly to a component instance.
The second usage example uses a dispatcher/listener event model. A component instance (componentInstance) dispatches an event (in this case, unload) and the event is handled by a function attached to a listener object (listenerObject) that you create. You define a method with the same name as the event on the listener object; the method is called when the event is triggered. When the event is triggered, it automatically passes an event object (eventObject) to the listener object method. Each event object has a set of properties that contains information about the event. You can use these properties to write code that handles the event. Finally, you call the UIEventDispatcher.addEventListener() method on the component instance that broadcasts the event to register the listener with the instance. When the instance dispatches the event, the listener is called.
For more information about event objects, see Event Objects.
The following example deletes sym1 when the unload event is triggered:
formListener.handleEvent = function(eventObj){
// eventObj.target is the component which generated the change event,
form.destroyObject(sym1);
}
form.addEventListener("unload", formListener);
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