ActionScript 2.0 Components Language Reference
ComboBox component > ComboBox.change

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.

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();

// Assign function to Listener Object.
cbListener.change = function(event_obj:Object) {
 trace("Value changed to: "+event_obj.target.selectedItem.label);
};

// Add Listener.
my_cb.addEventListener("change", cbListener);

See also

EventDispatcher.addEventListener()

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