Package	com.greensock.loading
Class	public class DataLoader
Inheritance	DataLoader LoaderItem LoaderCore flash.events.EventDispatcher
Subclasses	CSSLoader, XMLLoader

• name : String - A name that is used to identify the loader instance. This name can be fed to the LoaderMax.getLoader() or LoaderMax.getContent() methods or traced at any time. Each loader's name should be unique. If you don't define one, a unique name will be created automatically, like "loader21".
• format : String - Controls whether the downloaded data is received as text ("text"), raw binary data ("binary"), or URL-encoded variables ("variables").
• alternateURL : String - If you define an alternateURL, the loader will initially try to load from its original url and if it fails, it will automatically (and permanently) change the loader's url to the alternateURL and try again. Think of it as a fallback or backup url. It is perfectly acceptable to use the same alternateURL for multiple loaders (maybe a default image for various ImageLoaders for example).
• noCache : Boolean - If true, a "cacheBusterID" parameter will be appended to the url with a random set of numbers to prevent caching (don't worry, this info is ignored when you LoaderMax.getLoader() or LoaderMax.getContent() by url or when you're running locally)
• estimatedBytes : uint - Initially, the loader's bytesTotal is set to the estimatedBytes value (or LoaderMax.defaultEstimatedBytes if one isn't defined). Then, when the loader begins loading and it can accurately determine the bytesTotal, it will do so. Setting estimatedBytes is optional, but the more accurate the value, the more accurate your loaders' overall progress will be initially. If the loader is inserted into a LoaderMax instance (for queue management), its auditSize feature can attempt to automatically determine the bytesTotal at runtime (there is a slight performance penalty for this, however - see LoaderMax's documentation for details).
• requireWithRoot : DisplayObject - LoaderMax supports subloading, where an object can be factored into a parent's loading progress. If you want LoaderMax to require this DataLoader as part of its parent SWFLoader's progress, you must set the requireWithRoot property to your swf's root. For example, var loader:DataLoader = new DataLoader("text.txt", {name:"myText", requireWithRoot:this.root});
• autoDispose : Boolean - When autoDispose is true, the loader will be disposed immediately after it completes (it calls the dispose() method internally after dispatching its COMPLETE event). This will remove any listeners that were defined in the vars object (like onComplete, onProgress, onError, onInit). Once a loader is disposed, it can no longer be found with LoaderMax.getLoader() or LoaderMax.getContent() - it is essentially destroyed but its content is not unloaded (you must call unload() or dispose(true) to unload its content). The default autoDispose value is false.
  
  ----EVENT HANDLER SHORTCUTS----
• onOpen : Function - A handler function for LoaderEvent.OPEN events which are dispatched when the loader begins loading. Make sure your onOpen function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).
• onProgress : Function - A handler function for LoaderEvent.PROGRESS events which are dispatched whenever the bytesLoaded changes. Make sure your onProgress function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent). You can use the LoaderEvent's target.progress to get the loader's progress value or use its target.bytesLoaded and target.bytesTotal.
• onComplete : Function - A handler function for LoaderEvent.COMPLETE events which are dispatched when the loader has finished loading successfully. Make sure your onComplete function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).
• onCancel : Function - A handler function for LoaderEvent.CANCEL events which are dispatched when loading is aborted due to either a failure or because another loader was prioritized or cancel() was manually called. Make sure your onCancel function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).
• onError : Function - A handler function for LoaderEvent.ERROR events which are dispatched whenever the loader experiences an error (typically an IO_ERROR or SECURITY_ERROR). An error doesn't necessarily mean the loader failed, however - to listen for when a loader fails, use the onFail special property. Make sure your onError function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).
• onFail : Function - A handler function for LoaderEvent.FAIL events which are dispatched whenever the loader fails and its status changes to LoaderStatus.FAILED. Make sure your onFail function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).
• onIOError : Function - A handler function for LoaderEvent.IO_ERROR events which will also call the onError handler, so you can use that as more of a catch-all whereas onIOError is specifically for LoaderEvent.IO_ERROR events. Make sure your onIOError function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent).
• onHTTPStatus : Function - A handler function for LoaderEvent.HTTP_STATUS events. Make sure your onHTTPStatus function accepts a single parameter of type LoaderEvent (com.greensock.events.LoaderEvent). You can determine the httpStatus code using the LoaderEvent's target.httpStatus (LoaderItems keep track of their httpStatus when possible, although certain environments prevent Flash from getting httpStatus information).

 import com.greensock.loading.*;
 import com.greensock.events.LoaderEvent;
 import flash.utils.ByteArray;
 import flash.net.URLVariables;
 
//create a DataLoader for loading text (the default format)
var loader:DataLoader = new DataLoader("assets/data.txt", {name:"myText", requireWithRoot:this.root, estimatedBytes:900});

//start loading
loader.load();

//Or you could put the DataLoader into a LoaderMax. Create one first...
var queue:LoaderMax = new LoaderMax({name:"mainQueue", onProgress:progressHandler, onComplete:completeHandler, onError:errorHandler});

//append the DataLoader and several other loaders
queue.append( loader );
queue.append( new DataLoader("assets/variables.txt", {name:"myVariables", format:"variables"}) );
queue.append( new DataLoader("assets/image1.png", {name:"myBinary", format:"binary", estimatedBytes:3500}) );

//start loading the LoaderMax queue
queue.load();

function progressHandler(event:LoaderEvent):void {
 trace("progress: " + event.target.progress);
}

function completeHandler(event:LoaderEvent):void {
 var text:String = LoaderMax.getContent("myText");
 var variables:URLVariables = LoaderMax.getContent("myVariables");
 var binary:ByteArray = LoaderMax.getContent("myBinary");
 trace("complete. myText: " + text + ", myVariables.var1: " + variables.var1 + ", myBinary.length: " + binary.length);
}

function errorHandler(event:LoaderEvent):void {
 trace("error occured with " + event.target + ": " + event.text);
}
 

See also