Setting the selected index on the Spark ButtonBar control in Flex 4

The following example shows how you can set the selected index on a Spark ButtonBar control in Flex 4 by setting the selectedIndex property.

Full code after the jump.

The following example(s) require Flash Player 10 and the Adobe Flex 4 SDK. To download the Adobe Flash Builder 4 trial, see www.adobe.com/products/flex/. To download the latest nightly build of the Flex 4 SDK, see opensource.adobe.com/wiki/display/flexsdk/Download+Flex+4.

For more information on getting started with Flex 4 and Flash Builder 4, see the official Adobe Flex Team blog.

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/02/21/setting-the-selected-index-on-the-fxbuttonbar-control-in-flex-gumbo/ -->
<s:Application name="Spark_ButtonBar_selectedIndex_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/mx">
    <s:controlBarContent>
        <mx:Form>
            <mx:FormItem label="requiresSelection:">
                <s:CheckBox id="checkBox" />
            </mx:FormItem>
            <mx:FormItem label="selectedIndex:"
                         direction="horizontal">
                <s:HSlider id="slider"
                           minimum="-1"
                           maximum="5" />
                <s:Label text="{btnBar.selectedIndex}" />
            </mx:FormItem>
        </mx:Form>
    </s:controlBarContent>
 
    <s:ButtonBar id="btnBar"
                 selectedIndex="@{slider.value}"
                 requireSelection="{checkBox.selected}"
                 horizontalCenter="0" verticalCenter="0">
        <s:dataProvider>
            <s:ArrayList source="[One,Two,Three,Four,Five,Six]" />
        </s:dataProvider>
    </s:ButtonBar>
 
</s:Application>

This entry is based on a beta version of the Flex 4 SDK and therefore is very likely to change as development of the Flex SDK continues. The API can (and will) change causing examples to possibly not compile in newer versions of the Flex 4 SDK.

3 thoughts on “Setting the selected index on the Spark ButtonBar control in Flex 4

      1. If you wanted to do something similar in Flex 3.x, you’d need to use the MX ToggleButtonBar instead of a ButtonBar, as seen in the following example:

        <?xml version="1.0" encoding="utf-8"?>
        <mx:Application name="ToggleButtonBar_selectedIndex_test"
                xmlns:mx="http://www.adobe.com/2006/mxml">
            <mx:ApplicationControlBar dock="true">
                <mx:Form>
                    <mx:FormItem label="selectedIndex:"
                                 direction="horizontal">
                        <mx:HSlider id="slider"
                                   minimum="-1"
                                   maximum="5"
                                   snapInterval="1"
                                   tickInterval="1"
                                   liveDragging="true"/>
                        <mx:Label text="{tBtnBar.selectedIndex}" />
                    </mx:FormItem>
                </mx:Form>
            </mx:ApplicationControlBar>
         
            <mx:ToggleButtonBar id="tBtnBar"
                         selectedIndex="{slider.value}"
                         horizontalCenter="0" verticalCenter="0">
                <mx:dataProvider>
                    <mx:ArrayCollection source="[One,Two,Three,Four,Five,Six]" />
                </mx:dataProvider>
            </mx:ToggleButtonBar>
         
        </mx:Application>

        Peter

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