User Guide

DateField component (Flash Professional only) 375
DateField.change
Availability
Flash Player 6 (6.0 79.0).
Edition
Flash MX Professional 2004.
Usage
Usage 1:
on(change){
...
}
Usage 2:
listenerObject = new Object();
listenerObject.change = function(eventObject){
...
}
myDF.addEventListener("change", listenerObject)
Description
Event; broadcast to all registered listeners when a date is selected.
The first usage example uses an
on() handler and must be attached directly to a DateField
instance. The keyword
this, used inside an on() handler attached to a component, refers to the
component instance. For example, the following code, attached to the date field
myDF, sends
“_level0.myDF” to the Output panel:
on(change){
trace(this);
}
The second usage example uses a dispatcher/listener event model. A component instance (myDF)
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 the
EventDispatcher.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, see “EventDispatcher class” on page 415.