Apache – Access component id of one mxml from another

apache-flex

I have two mxml files. one is main that is application tag mxml file and another is my mxml component file.
I have a viewstack in my main mxml whose id is, say, "mainViewStack".
Now I want to set selectedChild property of "mainViewStack" from my mxml component file.
But I m getting error:
Error #1009: Cannot access a property or method of a null object reference.
on accessing mainObj.mainViewStack.selectedChild.id where mainObj is the object of main mxml file.
Please help me out.
Thank u.

Best Answer

My guess is that you're trying to access the child before it's created. But that's hard to tell without the code.

Try waiting until the FlexEvent.CREATION_COMPLETE event on the application to access the selected child.

Related Solutions

R – Using a composite MXML component from ActionScript

Bindable to the rescue:

<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        <![CDATA[
                [Bindable]
                public var iconType:String;
                [Bindable]
                public var fileName:String = "Filename";
                [Bindable]
                public var fileSize:String = "0 K";
        ]]>
    </mx:Script>
    <mx:Image id="ficon" source="{iconType}"/>
    <mx:Label id="fname" left="20" right="30" text="{fileName}" />
    <mx:Label id="fsize" right="0" text="{fileSize}" />
</mx:Canvas>

the values will be automatically updated when the components are created.

Actionscript – Flex – How to access component inside another component in MXML

By setting the id property of the MXML component you effectively make it a public property accessible via dot-notation. "Accessing it via MXML" is sort of a trick question. You can use binding notation within an xml tag and bind the property to another property, or you can access it in your Script block in the normal AS3 fashion.

Best Answer

Related Solutions

R – Using a composite MXML component from ActionScript

Actionscript – Flex – How to access component inside another component in MXML

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