AS 3.0 reference problem

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+2 Q:

AS 3.0 reference problem

I am finding it hard to fugure out the reference system in AS 3.0.

this is the code i have (i have trimmed it down in order to find the problem but to no avail)

package rpflash.ui {

import flash.display.Sprite;
import flash.display.MovieClip;
import flash.display.Stage;
import nowplaying;
import flash.text.TextField;

public class RPUserInterface extends Sprite{

    var np:nowplaying;

    public function RPUserInterface(){
        }

    public function init(){
        var np:nowplaying = new nowplaying();
        this.addChild(np)
        }

    public function updateplayer(xml:XML){
        var artist: String = xml.nowplaying.artist.toString();
        var title: String = xml.nowplaying.title.toString();
        trace("UI:update");
        trace(this.np);// this gives me a null reference
        }
}   
}

and still i cannot access np!!! trace this.np gives me a null reference. i am not even trying to access it from a subling class. (btw i def want to know how to do that as well.)

+2 A:

In your init() function, you are instantiating a local variable called np. Try this instead:

public function init() {
    // var np:nowplaying = new nowplaying();
    np = new nowplaying();
    this.addChild(np);
}

Also, make sure init() is getting called before updateplayer(). Hope that helps.

RJ Regenold 2010-04-10 11:35:19

To expand more, the "var" keyword always creates a new variable in the current scope. In the code you posted, you used "var" to declare your variable twice - the first time, you declare it outside of any functions, which is the correct way to declare a class property. The second time, when you declare it again inside a function, you are making a new variable which is scoped to within that function. Your later attempts to reference the variable don't work because they are referencing the class property, which never got initialized.

fenomas 2010-04-10 16:36:36

ansaurus

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AS 3.0 reference problem

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