Actionscript-3 URLLoader: ProgressEvent doesn't dispatch

I upload some data to my server with the help of URLLoader, and I listen to the ProgressEvent, but it doesn't dispatch. No errors, files get uploaded successfully. Why could it not work?

Code as follows:

//setup
urlLoader.addEventListener开发者_StackOverflow中文版(ProgressEvent.PROGRESS, onProgress);

//listen
private function onProgress(e:ProgressEvent):void {
    trace(e.bytesLoaded + ' ' + e.bytesTotal);
}

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I'm late to this answer, but seeing as how I just ran into it myself, I thought I'd add my two cents:

The reason you are not seeing any progress events for a POST/upload is because the URLLoader doesn't dispatch progress events (or change the "bytesLoaded" property) for uploads. Sad, but true.

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You don't show when you're actually calling the load() method. It should be :

 //setup
 urlLoader.addEventListener(ProgressEvent.PROGRESS, onProgress);
 urlLoader.load( new URLRequest( url ) );


 //listen
 private function onProgress(e:ProgressEvent):void {
    trace(e.bytesLoaded + ' ' + e.bytesTotal);
 }

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I presume the urlLoader is a loader object instance? If so you need to add the eventListener to the contentLoaderInfo property.

urlLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onProgress);