ComboBox中使用事件

 

代码

<? xml version = " 1.0 "  encoding = " utf-8 " ?>
< mx:Application xmlns:mx = " http://www.adobe.com/2006/mxml "  layout = " absolute "  creationComplete = " initCB(); " >
     < mx:Script >
         <! [CDATA[
             import  mx.events.DropdownEvent;
             private  function initCB(): void {
                var info:Array  =   new  Array();
                info.push({label: " 红 " , data:  " red " });
                info.push({label: " 绿 " , data:  " green " });
                info.push({label: " 蓝 " , data:  " blue " });
                _cb.dataProvider  =  info;
                
                _cb.addEventListener(DropdownEvent.CLOSE, chooseCB);
            }
             private  function chooseCB(evt:DropdownEvent): void {
                var obj:Object  =  _cb.selectedItem;
                _tip.text  =   " label: "   +  obj.label  +   "  data: "   +  obj.data;
            }
        ]] >
     </ mx:Script >
     < mx:ComboBox x = " 62 "  y = " 51 "  id = " _cb " ></ mx:ComboBox >
     < mx:TextArea x = " 62 "  y = " 81 "  height = " 114 "  id = " _tip " />
    
</ mx:Application >