AS3 event listeners inside loop - actionscript-3

Question

I'm having a bit of a hard time figuring this one out.
I'm creating an Air/Flash app that uploads files from a local directory to the server.(without user interaction).
I'm creating an Array of the files found in the folder and can upload them fine without any issues.
However, I can not keep track of the event listeners; meaning, the for loop obviously completes before the event listeners for each upload.
Is there a way to keep track of the event listeners and find out when the last one finished?
Any help is greatly appreciated...
Here's my code:
public var UPLOAD_URL:String = "http://myhost/dev/uptest.php";
upbtn.addEventListener(MouseEvent.CLICK, uploadme);
public function uploadme(event:MouseEvent):void
{
preloader.visible = true;
var desktop:File = File.applicationStorageDirectory.resolvePath("photo");
var files:Array = desktop.getDirectoryListing();
for (var i:uint = 0; i < files.length; i++)
{
var date:Date = new Date(); // get new date
var mytime:Number = Math.round(date.valueOf()/1000);
var ur:URLRequest = new URLRequest();
var uv:URLVariables = new URLVariables();
uv.filename = files[i].name;
ur.data = uv;
ur.method = URLRequestMethod.POST;
ur.url = UPLOAD_URL;
files[i].addEventListener(ProgressEvent.PROGRESS, updateProgress);
files[i].addEventListener(DataEvent.UPLOAD_COMPLETE_DATA, doneUpload);
files[i].addEventListener(IOErrorEvent.IO_ERROR, fileError);
files[i].upload(ur);
//trace(i)
function updateProgress(event:ProgressEvent):void
{
//wait preloader.visible = true;
//trace(event.currentTarget.name);
}
function doneUpload(event:DataEvent):void
{
//var loader2: URLLoader = URLLoader(event.target);
//trace(i);
trace(event.data);
//preloader.visible = false;
}
function fileError(event:IOErrorEvent):void
{
trace("error");
}
}
}

Answer 1

One approach is to keep track of how many files you're uploading and only act in the doneUpload listener once all files have finished:
private var numFiles:int = 0;
public function uploadme(event:MouseEvent):void
{
...
var files:Array = desktop.getDirectoryListing();
numFiles = files.length;
for (var i:uint = 0; i < files.length; i++)
...
}
function doneUpload(event:DataEvent):void
{
//var loader2: URLLoader = URLLoader(event.target);
//trace(i);
trace(event.data);
numFiles--;
if (numFiles == 0) {
trace("All the files are done uploading.");
}
//preloader.visible = false;
}