MACROMEDIA FLASH MX 2004-USING COMPONENTS Use Manual page 733

The second usage example uses a dispatcher/listener event model. A component instance
(
textAreaInstance
function, also called a handler, on a listener object (
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
( ) to the listener object method. Each event object has properties that contain
eventObject
information about the event. You can use these properties to write code that handles the event.
Finally, you call the
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
Example
This example uses the dispatcher/listener event model to track the total of number of times the
text field has changed in a TextArea component named
// define a listener object
var myTextAreaListener:Object = new Object();
// create a Number variable to track the number of changes to the TextArea
var changeCount:Number = 0;
// define a function that is executed whenever the listener receives
// notification of a change in the TextArea component
myTextAreaListener.change = function(eventObj) {
changeCount++;
trace("Text has changed " + changeCount + " times now!");
trace("It now contains: " + eventObj.target.text);
}
// register the listener object with the TextArea component instance
myTextArea.addEventListener("change", myTextAreaListener);
See also
EventDispatcher.addEventListener()
TextArea.editable
Availability
Flash Player 6 (6.0 79.0).
Edition
Flash MX 2004.
Usage
textAreaInstance.editable
) dispatches an event (in this case,
EventDispatcher.addEventListener()
"EventDispatcher class" on page
) and the event is handled by a
change
) that you create. You define
listenerObject
method on the component
415.
:
myTextArea
TextArea component 733