User Guide

ComboBox.change 173
ComboBox.change
Availability
Flash Player 6 (6.0.79.0).
Edition
Flash MX 2004.
Usage
var listenerObject:Object = new Object();
listenerObject.change = function(eventObject:Object) {
// Your code here.
};
comboBoxInstance.addEventListener("change", listenerObject)
Description
Event; broadcast to all registered listeners when the ComboBox.selectedIndex or
ComboBox.selectedItem property changes as a result of user interaction.
Using a dispatcher/listener event model, a component instance (
comboBoxInstance)
dispatches an event (in this case,
change) 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. Finally, you call
addEventListener() (see EventDispatcher.addEventListener()) 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, see “EventDispatcher class” on page 499.
Example
With a ComboBox component instance my_cb on the Stage, the following example sends the
instance name of the component that generated the
change event to the Output panel:
// Add Item to List.
my_cb.addItem({data:1, label:"First Item"});
my_cb.addItem({data:2, label:"Second Item"});
// Create Listener Object.
var cbListener:Object = new Object();