ActionScript 2.0 Components Language Reference 
ActionScript 2.0 Components Language Reference |
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| ComboBox component > ComboBox.itemRollOver | |||
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Flash Player 6 (6.0.79.0).
Flash MX 2004.
var listenerObject:Object= new Object();listenerObject.itemRollOver = function(eventObject:Object) {// Your code here. };comboBoxInstance.addEventListener("itemRollOver",listenerObject)
In addition to the standard properties of the event object, the itemRollOver event has an index property. The index is the number of the item that the pointer rolled over.
Event; broadcast to all registered listeners when the pointer rolls over pop-up list items. This is a List event that is broadcast from a combo box. For more information, see List.itemRollOver.
Using the dispatcher/listener event model, a component instance (comboBoxInstance) dispatches an event (in this case, itemRollOver) and the event is handled by a function, also called a handler, on 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 properties that contain information about the event. You can use these properties to write code that handles the event. For more information, see EventDispatcher class.
Finally, you call the 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.
With a ComboBox instance my_cb on the Stage, the following ActionScript sends a message to the Output panel that indicates the item index and the event when the pointer rolls on or off an item:
my_cb.addItem({data:1, label:"First Item"});
my_cb.addItem({data:2, label:"Second Item"});
// Create Listener Object.
var cbListener:Object = new Object();
cbListener.itemRollOver = function(evt_obj:Object) {
trace("index: " + evt_obj.index + ", event: " + evt_obj.type);
};
cbListener.itemRollOut = function(evt_obj:Object) {
trace("index: " + evt_obj.index + ", event: " + evt_obj.type);
};
// Add Listener.
my_cb.addEventListener("itemRollOver", cbListener);
my_cb.addEventListener("itemRollOut", cbListener);
ComboBox.itemRollOut, EventDispatcher.addEventListener()
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