Apologies, both were additions/modifications to the code that you posted. So, add
this.dispatchEvent(new Event("LoadTextFile.dataloaded"));
to the end of method "onCompleteTextLoad" in your LoadTextFile class,
and " extends EventDispatcher" to it's definition, to make :
"public class LoadTextFile extends EventDispatcher"
(You'll also need to include EventDispatcher in that class)
It will then dispatch an event when the data is ready.
The second bit was just modifications to your "controller" class example code,
in other words adding an event listener to an instance of LoadTextFile,
and providing a function that gets called when the event occurs(at which point
the data is available, before that it will be null, as you found).
-----Original Message-----
From: [email protected] on behalf of dnk
Sent: Sat 03/05/2008 21:59
To: [email protected]
Subject: Re: [flexcoders] Why would this assignment to a MVC model return null?
and which file it should be in, etc....
On Sat, May 3, 2008 at 1:51 PM, dnk <[EMAIL PROTECTED]> wrote:
> Ok, just trying to look through the code sample provided.... a little
> confused due to my old code still being in there.....
>
>
>
>
> On Sat, May 3, 2008 at 12:55 PM, Jim Hayes <[EMAIL PROTECTED]> wrote:
> >
> >
> >
> >
> >
> >
> > It's because the loading of the text file is asynchronous, and in your
> > example
> >
> >
> > var myTxt2:LoadTextFile = new LoadTextFile("file2.txt");
> > // populate my model with the results
> > myprojectmodel.getInstance().mytext2 = myTxt2.data;
> >
> > you access it's data variable immediately after instructing it to load the
> > text.
> >
> > Instead, you need to wait until that load is done before accessing data.
> > I'd probably get the loadtextFile class to raise an event when that
> > happens, have your main app listen for it.
> >
> >
> > public function onCompleteTextLoad(e:Event):void
> > {
> > var vars:URLVariables = new URLVariables(e.target.data);
> > trace("LOOK HERE: " + vars.thetext);
> > this._mydata = vars.thetext;
> > trace("from mydata: " + this._mydata);
> >
> > // If below added, the model is populated
> > // myprojectmodel.getInstance().mytext2 = vars.thetext;
> >
> > this.dispatchEvent(new Event("LoadTextFile.dataloaded"));
> >
> >
> > var myTxt2:LoadTextFile = new LoadTextFile("file2.txt");
> > // populate my model with the results
> > //myprojectmodel.getInstance().mytext2 = myTxt2.data;
> > myTxt2.addEventListener("LoadTextFile.dataloaded", gotData)
> >
> > private function gotData(event:Event):void
> > {
> > var myTxt2:LoadTextFile = LoadTextFile(event.target)
> >
> > myprojectmodel.getInstance().mytext2 = myTxt2.data;
> > myTxt2.removeEventListener("LoadTextFile.dataloaded", gotData);
> > }
> >
> > LoadTextFile will have to extend EventDispatcher.
> >
> > HTH ! (been there myself, when I started!)
> >
> >
> >
> > -----Original Message-----
> > From: [email protected] on behalf of dnk
> > Sent: Sat 03/05/2008 20:22
> > To: flexcoders list
> > Subject: [flexcoders] Why would this assignment to a MVC model return
> null?
> >
> > Ok, I am using a easymvc structure (tom bray version), and i have run
> > into an issue that is killing me!
> >
> > I am simply loading in some vars from a text file, and to do so i
> > wrote a utility class (to make it reusable).
> >
> > Now in my class, if I populate my model var, it works fine. But it
> > makes that class not very reusable.
> >
> > So I added a var to store the result, and made a getter method.
> >
> > Now in my utility class it looks like this:
> >
> > package myproject.util
> > {
> > // for text loading
> > import flash.events.*;
> > import flash.net.*;
> >
> > public class LoadTextFile
> > {
> >
> > private var _mydata:String;
> >
> > public function LoadTextFile(myFile:String)
> > {
> > var req:URLRequest = new URLRequest(myFile);
> > var url_loader:URLLoader = new URLLoader(req);
> > url_loader.addEventListener(Event.COMPLETE, onCompleteTextLoad);
> > url_loader.addEventListener(IOErrorEvent.IO_ERROR, onErrorTextLoad);
> > //trace("called in loadTxtFile: " + myFile);
> > }
> >
> > public function onCompleteTextLoad(e:Event):void
> > {
> > var vars:URLVariables = new URLVariables(e.target.data);
> > trace("LOOK HERE: " + vars.thetext);
> > this._mydata = vars.thetext;
> > trace("from mydata: " + this._mydata);
> >
> > // If below added, the model is populated
> > // myprojectmodel.getInstance().mytext2 = vars.thetext;
> >
> > }
> >
> > public function onErrorTextLoad(e:IOErrorEvent):void
> > {
> > trace("Something wrong! Could not load file.");
> > }
> >
> > public function get data():String
> > {
> > return this._mydata;
> > }
> >
> > }
> > }
> >
> > The traces in the class come back with the proper data. So the _mydata
> > var is populated.
> >
> > Now from my controller: I would have a function that contained
> > something like this:
> >
> > // new instance
> > var myTxt:LoadTextFile = new LoadTextFile("file.txt");
> > // populate my model with the results
> > myprojectmodel.getInstance().mytext = myTxt.data;
> >
> > // another instance
> > var myTxt2:LoadTextFile = new LoadTextFile("file2.txt");
> > // populate my model with the results
> > myprojectmodel.getInstance().mytext2 = myTxt2.data;
> >
> > trace("From Data in controller using getter: " + myTxt.data);
> >
> > And this trace comes back null! WHich means it obviously never
> > populates my model.
> >
> > Why would this happen?
> >
> > It seems to be pretty basic code. But I am driving myself insane!!!!
> >
> > DNK
> >
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>
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