Re: [flexcoders] Variable Initialization Bug? Data Binding Issues in Flex 1.5

Ben Lucyk Wed, 07 Dec 2005 14:19:20 -0800

Thanks for the tip Matt.

Do you have any more details (or a good reference to point me towards) as to why this is the case though? There doesn't seem to be any problem initializing an instance variable this way at the "component" level. Has this behavior changed at all in Flex 2.0 that you know of?

Ben

On 12/6/05, Matt Chotin <[EMAIL PROTECTED]> wrote:

Instance variable assignment in the declaration is always dangerous because dependencies are generally not tracked for initialization purposes. Assigning the variable in a function that's called later (like creationComplete or even initialize) is considered the best-practice.

Matt

From: flexcoders@yahoogroups.com [mailto:flexcoders@yahoogroups.com] On Behalf Of Ben Lucyk
Sent: Tuesday, December 06, 2005 1:03 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Variable Initialization Bug? Data Binding Issues in Flex 1.5

OK, help me out here, 'cause I've been scratchin' my head a little too hard on this one...

What I'm trying to do is setup a simple static class to use as a pointer to my main, global model, from within my MXML components. I've been running into some "interesting" behavior that I can't explain, and I'm wondering if anyone can help shed some light.   (Couldn't find much help in the docs or forums)

I'm seeing that when I'm at the <mx:Application> level and I try to bind to a "global" variable that is initialized from the static class I mentioned above, no binding takes place unless I initialize the var after creationComplete(). This is NOT required however, when I'm trying to use the same type of binding in a component. (The var seems to initialize fine)

I should mention that I've also tested this using a "normal" class ( var resource:String = new com.StaticResource().test;), and also a singleton class ( var resource = com.StaticResource.getInstance().test;). No difference.

Any thoughts?

<<<< Sample Code >>>>



class com.StaticResource {
    public static var test:String = "Bliggidy!";
}





<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx=" http://www.macromedia.com/2003/mxml"
     creationComplete="doCreated()">
     <mx:Script>
     <![CDATA[

      // Does not work here, only at "component" level!
      //var resource:String = com.StaticResource.test;
      var resource:String;

      function doCreated() {
           // Var must be set AFTER creationComplete in
           // order to bind successfully!
           resource = com.StaticResource.test;
      }

     ]]>
     </mx:Script>
     <mx:HBox>
          <mx:Label text="Parent Level:" />
          <mx:Label text="{resource}" />
     </mx:HBox>
     <components:testStaticBindingComponent xmlns:components="components.*" />
</mx:Application>





<?xml version="1.0" encoding="utf-8"?>
<mx:HBox xmlns:mx=" http://www.macromedia.com/2003/mxml">
    <mx:Script>
    <![CDATA[
     // Does NOT need to wait for creationComplete() in order to
     // bind successfully!
     var componentResource:String = com.StaticResource.test;    //OK...

    ]]>
    </mx:Script>
    <mx:Label text="Component Level:" />
    <mx:Label text="{componentResource}" />
</mx:HBox>



Also, how are ModelLocators typically implemented using the Cairngorm framework?

Thanks in advance,
-Ben Lucyk

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Ben Lucyk
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Re: [flexcoders] Variable Initialization Bug? Data Binding Issues in Flex 1.5

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