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 beta, check out the Adobe Flash Builder 4 page on the Adobe Labs site. To download the latest build of the Flex 4 SDK, see http://opensource.adobe.com/wiki/display/flexsdk/Download+Flex+4. For instructions on using the beta Flex 4 SDK in Flex Builder 3, see "Using the beta Flex 4 SDK in Flex Builder 3".
<?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 comments… read them below or add one }
Exactly. Using selectedIndex is broken in flex 3.3, this example does not function.
@Zanpher,
This is a Flex 4 example, it will not run in Flex 3.x.
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:
Peter