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Editorial Team
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Asked: 2026-05-16T15:45:42+00:00

I’m binding two AutoCompleteModified objects to one another; meaning you type in one and

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I’m binding two AutoCompleteModified objects to one another; meaning you type
in one and it selects the correct object in the other. It works fine when I
define it in MXML:

However, a user can add a new row to a Grid and then I set up the binding and
objects via actionscript and it gives an ‘undefined’ error: ChangeWatcher line 427/wrapHandler.

var innerHBox:HBox = new HBox();

var dtc_acm:AutoCompleteModified = new AutoCompleteModified();
dtc_acm.dataProvider = data2;
dtc_acm.labelField = ‘id’;

var cp_acm:AutoCompleteModified = new AutoCompleteModified();
cp_acm.dataProvider = data2;
cp_acm.labelField = ‘name’;cp_acm.width = this.CP1.width;

BindingUtils.bindProperty( dtc_acm,’selectedIndex’,cp_acm,’selectedIndex’ );

BindingUtils.bindProperty( cp_acm,’selectedItem’,dtc_acm,’selectedItem’ );

innerHBox.addChild( dtc_acm );
innerHBox.addChild( cp_acm );

I don’t understand what may be happening here. Can anyone see any potential
problems in my code? If I only keep it 1-way binding then it works fine. But both throw this error. Is there something about not only doing it 2-way in actionscript, but adding components that aren’t on the stage yet?

Thank you kindly for any helpful tips,

Matt

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1 Answer

  1. Editorial Team

    I’m trying to do the same thing. It works in MXML but not in AS. For example, this works:

    <mx:TextArea id="t1" verticalScrollPosition="{t2.verticalScrollPosition}" height="200"/>
<mx:TextArea id="t2" verticalScrollPosition="{t1.verticalScrollPosition}" height="200"/>

    If I scroll one of the TextAreas then the other one scrolls too. However, trying to do the same thing in actionscript causes a stack overflow (infinite loop)

    BindingUtils.bindProperty( _t1, 'verticalScrollPosition', _t2, 'verticalScrollPosition' );
BindingUtils.bindProperty( _t2, 'verticalScrollPosition', _t1, 'verticalScrollPosition' );

    I used the -keep-generated-actionscript compiler option and looked at the generated asctionscript for the mxml example and it creates a couple mx.binding.Binding objects and it looks like the key is setting the twoWayCounterpart property. I haven’t tried mimicking that code yet but it might help you.

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