Question

I know there are a million questions on the web regarding the AS3 compiler error 1120: Access of undefined property <property>, but this case is just weird.

I am skinning an <s:Application> component in Flex 4.6, and I am within the skin MXML file. The line super.addEventListener(Event.ADDED_TO_STAGE, positionObjects); is giving me issues saying: 1120: Access of undefined property positionObjects. However positionObjects is declared right underneath it. Any idea what’s wrong?

<fx:Script>
    <![CDATA[
        /**
         *  @private
         */
        override protected function updateDisplayList(unscaledWidth:Number, 
            unscaledHeight:Number) : void
        {
            bgRectFill.color = getStyle('backgroundColor');
            bgRectFill.alpha = getStyle('backgroundAlpha');
            super.updateDisplayList(unscaledWidth, unscaledHeight);
        }

    //Listen for when objects are added to the stage, before positioning them
        [Bindable]
        private var logoX:Number = 0;

        super.addEventListener(Event.ADDED_TO_STAGE, positionObjects);

        private function positionObjects(e:Event):void {
            this.logoX = stage.stageWidth / 3;
        }
    ]]>
</fx:Script>

Thank you for your time.

Answer 1

I figured out why I was getting an error. I wasn’t thinking and assuming that I could add an event listener outside of an initialization handler. I was, for some reason, thinking that AS3 would run through the compiled <fx:Script> tag the way interpreters execute procedural scripts.

I didn’t think, again, for some reason, to add an addedToStage attribute to the <s:Skin> tag, and have it execute the positionObjects method from there. All is well now.