1. <?xml version="1.0" encoding="utf-8"?>      
2. <mx:ComboBox xmlns:mx="http://www.adobe.com/2006/mxml" enter="toggleFilter(event)" editable="true">      
3. <mx:Script>      
4.     <![CDATA[      
5. import com.eshangrao.util.ObjectKeyMap;       
6. import mx.events.FlexEvent;      
7. import mx.collections.ArrayCollection;      
8. //需要2個重要引數1.dataprovider:arrcoll 2.item.name的這個過濾屬性    
9. private var _labelName:String = "labelName";       
10. public function set labelName( value:String ) : void
11.         {       
12.                  _labelName = value;       
13.                  invalidateProperties();       
14.         }       
15. public function get labelName() : String      
16.         {       
17. return _labelName;       
18.         }      
19. private function toggleFilter(event:FlexEvent):void{      
20. //trace(this.text);   
21. //trace(event.currentTarget.text);   
22. if (event.currentTarget.text!="") {      
23. //var filtStr:String=event.currentTarget.text;   
24. this.dataProvider.filterFunction = processFilter;      
25.             } else {      
26. this.dataProvider.filterFunction = null;      
27.             }      
28. this.dataProvider.refresh();      
29.             }      
30. private function processFilter(item:Object):Boolean {      
31. //trace((String)(item.name));   
32. //trace((String)(item["name"]));   
33. return ((String)(item[_labelName])).indexOf(this.text)==0;      
34.             }      
35.     ]]>      
36. </mx:Script>      
37. </mx:ComboBox>    

<?xml version="1.0" encoding="utf-8"?>   
<mx:ComboBox xmlns:mx="http://www.adobe.com/2006/mxml" enter="toggleFilter(event)" editable="true">   
<mx:Script>   
    <![CDATA[   
        import com.eshangrao.util.ObjectKeyMap;    
        import mx.events.FlexEvent;   
        import mx.collections.ArrayCollection;   
           
        //需要2個重要引數1.dataprovider:arrcoll 2.item.name的這個過濾屬性    
        private var _labelName:String = "labelName";    
        public function set labelName( value:String ) : void    
        {    
                 _labelName = value;    
                 invalidateProperties();    
        }    
        public function get labelName() : String   
        {    
                 return _labelName;    
        }   
       
        private function toggleFilter(event:FlexEvent):void{   
            //trace(this.text);   
            //trace(event.currentTarget.text);   
            if (event.currentTarget.text!="") {   
                //var filtStr:String=event.currentTarget.text;   
                this.dataProvider.filterFunction = processFilter;   
            } else {   
                this.dataProvider.filterFunction = null;   
            }   
                this.dataProvider.refresh();   
            }   
        private function processFilter(item:Object):Boolean {   
            //trace((String)(item.name));   
            //trace((String)(item["name"]));   
            return ((String)(item[_labelName])).indexOf(this.text)==0;   
            }   
       
    ]]>   
</mx:Script>   
</mx:ComboBox>