先前公司有一项目中有一这样需求，在网上google一大把，无解决办法，最近听高人指见用自定义事件和数据绑定来实现
我研究了两天才解决此问题，我觉得挺有意思，让我了解了flex事件的强大功能；
今天闲来整理一下，现将解决办法详细说明如下：
1.先自定义一个事件(CustomEvent .as)：
import flash.events.Event;
public class CustomEvent extends Event
{
?
? public var data:Object;
?
? public var index:Object;
????????
??????? public static const EVENT_NAME:String = "event_name";
????????
??????? public function CustomEvent(type:String,index:Object=null,data:Object = null)
??????? {
??????????? super(type);
??????????? this.index=index;
??????????? this.data = data;
??????? }
?
}
第一个itemrenderer的combobox中的change()事件中实现自定义事件监听，;
其中妙处所在owner这个类的引用
public function change():void{
???? data.DATETIME_TYPE=alarmActionDateType.selectedItem.ITEM_CODE;
?? this.owner.dispatchEvent(new CustomEvent(CustomEvent.EVENT_NAME,data.onlyID,alarmActionDateType.selectedItem.ITEM_CODE));
??? }
??
在第二个itemrenderer中的createComplete方法中定义一个init()方法;
? public function init():void
????? {
?????? this.owner.addEventListener(CustomEvent.EVENT_NAME,ophandler);
}
public function ophandler(event:CustomEvent):void
????? {
?????? if(event.index==data.onlyID){
??????? var resultList:ArrayCollection=getOplist(event.data.toString());
??????? //给data.operator赋值
????????? if(resultList.length>0){
????? operator.dataProvider=resultList;
??????
????? for each(var o:Object in resultList)
???????????? {
????????????? if(data.OPERATOR == o.ITEM_CODE)
????????????? {
?????????????? operator.selectedItem = o;
?????????????? return;
????????????? }
???????????? }
??????????? operator.selectedIndex=0;
??????????? data.OPERATOR=operator.selectedItem.ITEM_CODE;
???? }else{
????? operator.dataProvider = "";
???? }
???????
?????? }
?????? }
其实这个onlyID是我在表格中自动生成的序号，我用此来实现辨别现在操作的是哪一行，不然会出现改变一个下拉列表，其它行的下拉列表都会变的问 题；
<mx:DataGrid id="you_dg" width="98%" height="98%">
?? <mx:columns>
??? <mx:DataGridColumn headerText="序号" width="70" minWidth="70">??
??????????????? <mx:itemRenderer>??
??????????????????? <mx:Component>??
??????????????????????? <mx:Label text="{this.parentDocument.genrowno(data)}"/>??
??????????????????? </mx:Component>??
??????????????? </mx:itemRenderer>??
???????????? </mx:DataGridColumn>
? <mx:DataGridColumn headerText="combobox1"? width="130" minWidth="130" dataField="ITEM_CODE" itemRenderer="ComboboxSendType">
??? </mx:DataGridColumn>
??? <mx:DataGridColumn headerText="combobox2"? width="130" minWidth="130" dataField="OPERATOR" itemRenderer="ComboboxDynamicOperator"></mx:DataGridColumn>
?? public function genrowno(ob:Object):String {??
????????? ob.onlyID=String(you_dg.dataProvider.getItemIndex(ob)+1);
??????????????? return String(you_dg.dataProvider.getItemIndex(ob)+1);??
????????? }??????
这样即可解决实现下拉列表联动的问题
