event.bytesLoaded - Access of undefined property event - actionscript-3

Question

1120: Access of undeined property event.
...is thrown for both event.bytesLoaded and event.bytesTotal
public class Main extends MovieClip {
public function Main() {
system_load.bar.scaleX = 0;
this.stage.addEventListener(Event.ENTER_FRAME, this._loadUpdate);
}
private function _loadUpdate( e:Event ):void {
var bl:int = event.bytesLoaded;
var bt:int = event.bytesTotal;
system_load.bar.scaleX = (bl/bt);
}
}
I'm unsure of what to import to make this work. Currently has the following imported:
import flash.display.MovieClip;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.events.ProgressEvent;
Just ask and I'll provide with more details.

Answer 1

The reason you are getting this error is because the listener you added is using an Event type and not a ProgressEvent. The ProgressEvent class has the properties bytesLoaded and bytesTotal, whereas the Event class does not. What you are looking for is usage of the ProgressEvent.PROGRESS. An example would be:
myLoader.contentLoaderInfo.addEventListener( ProgressEvent.PROGRESS, loadUpdate );
Although your current implementation is not actually loading anything because you added the listener to the stage and not a loader, so the progress would not be displayed. For relevant examples check out the ProgressEvent class here:
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/events/ProgressEvent.html#includeExamplesSummary
Here's a quick and dirty example I put together loading an image:
var myLoader:Loader = new Loader();
myLoader.contentLoaderInfo.addEventListener( ProgressEvent.PROGRESS, loadUpdate );
myLoader.load( new URLRequest("path/to/image.png") );
Then you could just use your loadUpdate() as is.

Answer 2

your event variable is called e and not event. Try:
private function _loadUpdate( event:ProgressEvent ):void {
var bl:Number = event.bytesLoaded;
var bt:Number = event.bytesTotal;
system_load.bar.scaleX = (bl/bt);
}
Edit: i suggest you to use ProgressEvent if you want to access to bytesLoaded and bytesTotal