Change event for ComboBox

    
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        
        import flash.events.Event;
        import mx.events.DropdownEvent;

        private function dropEvt(event:DropdownEvent):void {
            forChange.text+=event.type + "\n";
        }

        private function changeEvt(event:Event):void {
            forChange.text+=event.currentTarget.selectedItem.label + " " + event.currentTarget.selectedIndex + "\n";
        }
      
    </mx:Script>
    <mx:ComboBox open="dropEvt(event)" close="dropEvt(event)" change="changeEvt(event)">
        <mx:ArrayCollection>
            <mx:Object label="A" data="AA" />
            <mx:Object label="B" data="BB" />
            <mx:Object label="C" data="CC" />
        </mx:ArrayCollection>
    </mx:ComboBox>
    <mx:TextArea id="forChange" width="150" height="100%" />
</mx:Application>

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Change event for ComboBox : ComboBox Event « Components « Flex

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