DataBinding Spark RadioButtonGroup to Spark RadioButton Value

Question

I have two radio buttons I am trying to bind to the value of a dataProvider. It populates the value initially, but if I change dp in my code it doesn't do anything. Am I missing something?

Here is a working example

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx"
>
    <fx:Declarations>
        <s:RadioButtonGroup id="oneGroup" selectedValue="{dataProvider.one}"/>
        <s:RadioButtonGroup id="twoGroup" selectedValue="{dataProvider.two}"/>
    </fx:Declarations>
    <fx:Script>
        <![CDATA[

            import mx.collections.ArrayCollection;

            [Bindable] 
            public var dataProvider:Object = {one:"active",two:false};

            public function doinit(e:Event):void {
                dataProvider.one = dataProvider.one == "inactive" ? "active":"inactive";
                dataProvider.two = !dataProvider.two;
                result.text = dataProvider.one + ":" + dataProvider.two; 
            }
        ]]>
    </fx:Script>
    <mx:HBox>
        <mx:Form>
            <mx:FormItem label="One" direction="horizontal" >
                <s:RadioButton groupName="oneGroup" value="active" label="Active" />
                <s:RadioButton groupName="oneGroup" value="inactive" label="Inactive" />
            </mx:FormItem>
            <mx:FormItem label="Two" direction="horizontal" >
                <s:RadioButton groupName="twoGroup" value="true" label="True" />
                <s:RadioButton groupName="twoGroup" value="false" label="False" />
            </mx:FormItem>
            <s:Button label="Change DP" click="doinit(event)" />
            <s:Label id="result" />
        </mx:Form>
    </mx:HBox>
</s:Application>

Link to documentation... http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/controls/RadioButtonGroup.html#selectedValue

Answer 1

Try to use the following class to have advantage of data binding:

package
{

[Bindable]
public class DP
{
    public var one:String;
    public var two:Boolean;

    public function DP(one:String, two:Boolean)
    {
        this.one = one;
        this.two = two;
    }
}
}

So for your sample:

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
    xmlns:s="library://ns.adobe.com/flex/spark" 
    xmlns:mx="library://ns.adobe.com/flex/mx"
    >
    <fx:Declarations>
        <s:RadioButtonGroup id="oneGroup" selectedValue="{dataProvider.one}"/>
        <s:RadioButtonGroup id="twoGroup" selectedValue="{dataProvider.two}"/>
    </fx:Declarations>
    <fx:Script>
    <![CDATA[
        [Bindable] 
        public var dataProvider:DP = new DP("active", false);

        public function doinit(e:Event):void {
            dataProvider.one = "inactive";
            dataProvider.two = true;
        }
    ]]>
    </fx:Script>
    <mx:HBox>
        <mx:Form>
            <mx:FormItem label="One" direction="horizontal" >
                <s:RadioButton group="{oneGroup}" value="active" label="Active" />
                <s:RadioButton group="{oneGroup}" value="inactive" label="Inactive" />
            </mx:FormItem>
            <mx:FormItem label="Two" direction="horizontal" >
                <s:RadioButton group="{twoGroup}" value="true" label="True" />
                <s:RadioButton group="{twoGroup}" value="false" label="False" />
            </mx:FormItem>
            <s:Button label="Change DP" click="doinit(event)" />
        </mx:Form>
    </mx:HBox>
</s:Application>