How do I handle a custom event in ActionScript 3? - actionscript-3

Question

I've created an Event Handler/Listener like so:
import flash.events.Event;
public class DanielEvent extends Event {
public var data:*;
public static const APP_STARTED:String = "APP_STARTED";
public function DanielEvent(n:String, data:*){
this.data = data;
super(n)
}
}
Listening to an event using:
addEventListener(DanielEvent.APP_STARTED, appStarted);
Dispatching an event by:
dispatchEvent(new DanielEvent("APP_STARTED", "test"))
And receiving the data by:
private function appStarted(e:Event){
trace(e.data)
}
But I get the error:
Access of possibly undefined property
data through a reference with static
type flash.events:Event.

Answer 1

You have to use your custom event type in the event handler, if you want to access the data property:
private function appStarted(e:DanielEvent): void {
trace(e.data);
}

Answer 2

your event handler is passed a DanielEvent, not an Event:
private function appStarted(e:DanielEvent):void
{
trace(e.data);
}
also. you should also use your constant for your dispatch instead of passing a string, like you've done for your listener:
dispatchEvent(new DanielEvent(DanielEvent.APP_STARTED, "test"));
and don't forget to override clone() if you are planning on dispatching that event more than once.
public override function clone():Event
{
return new DanielEvent(n, data);
}