Uploading Multiple Selectable Files with Flash9 and AS3

Uploading on the internet is pretty arcane. Either you have to individually select each file with the browse file input, install some activex control or use java to select multiple files. It always ends up being a tedious action.

But Flash is the new champ in file upload for the web, as with video, Flash just makes it simple. The FileReferenceList class and its browse method pop up the multiple file select box where the user can hold CTRL or SHIFT to select multiple files and watch them all drop in rather than having to painstakingly select them one by one and not having to install an unknown activex or java applet.

Here’s script to upload multiple files (or get the multiple file select box).
var fileRefList:FileReferenceList = new FileReferenceList();
fileRefList.addEventListener(Event.SELECT, selectHandler);

function selectHandler(event:Event):void
var request:URLRequest = new URLRequest("http://www.%5Byourdomain%5D.com/upload/");
var file:FileReference;
var files:FileReferenceList = FileReferenceList(event.target);
var selectedFileArray:Array = files.fileList;
for (var i:uint = 0; i < selectedFileArray.length; i++) { file = FileReference(selectedFileArray[i]); file.addEventListener(Event.COMPLETE, completeHandler); try { file.upload(request); } catch (error:Error) { trace("Unable to upload files."); } } } function completeHandler(event:Event):void { trace("uploaded"); }[/sourcecode] [source]

SWFUpload is based on this and is a nice AJAX based script that uses ExternalInterface in AS3 to pass the javascript presentation to the flash uploader.

The multiple file select, checking the file size before uploading and the ExternalInterface access for Actionscript to talk to Javascript makes Flash the best option for online file uploads for the web yet.

Fluid Flash Layouts

Photo Sharing and Video Hosting at PhotobucketHere’s how to do Fluid Flash layouts quickly without Flex.

Fluid layouts are not new but fhard to come by documentation.

To create a Flash fluid layout, essentially what you do is create a Flash movie that is set to 100% in HTML/SWFObject/XHTML but scaling set to noScale. Then in the flash script you position each element as needed on a resize handler.

This works great for applications built in Flash that will need to scale such as an IDE, a word processor, an image editing programs or programs that might have floating panels and tools.

1) Make your flash movie HTML scaled to the browser:

If you are using deconcept’s excellent SWFObject (be sure to download it) then see this sample for the HTML embedding with js swfobject.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">


<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />


<script type="text/javascript" src="swfobject.js"></script>

<style type="text/css"> /* hide from ie on mac */

 html {

  height: 100%;

  overflow: hidden;


#flashcontent {

  height: 100%;


 /* end hide */

body {

  height: 100%;

  margin: 0;

  padding: 0;





 <div id="flashcontent">

  <strong>You need to upgrade your Flash Player</strong>


<script type="text/javascript">

  // <![CDATA[

var so = new SWFObject("myMovie.swf", "myMovie", "100%", "100%", "8", "#efefef");

  so.addParam("scale", "noscale");


// ]]>




2) Inside your flash code:


Stage.align = "TL"; // Top left align the stage

Stage.scaleMode = "noScale"; // Set noScale for containing stage.// CREATE A LISTENER OBJECTsizeListener = new Object();// ATTACH THE ON RESIZE EVENT TO THE LISTENERsizeListener.onResize = function()


// In the event call a method to move the items

// or, call each item here to be sized

movieToBeCentered._x = Stage.width/2;

movieToBeCentered._y = Stage.height/2;

movieToBeCentered._width = Stage.width * .5;

// add other movie clips to position...







 import flash.display.*;

 import flash.events.*;

 import flash.utils.*;

public class AppMain extends MovieClip


  public function AppMain()



   stage.align = "TL"; // Top left align the stage

   stage.scaleMode = "noScale";  // items do not stretch to fit

  public function onResize(event:Event)


   // In the event call a method to move the items

   // or, call each item here to be sized

   movieToBeCentered.x = stage.width/2;

   movieToBeCentered.y = stage.height/2;

   movieToBeCentered.scaleX = stage.width * .5;

   // ... etc




This allows you to see easily how you can make a fluid layout in flash that scales with more of an alignment lock rather than the whole movie scaling.

A demo and toolkit will be available soon with an easy class library soon. For now you can go here to get a demo and source from the http://www.tutorio.com/tutorial/liquid-flash-layout site.