使你的TextInput组件只能输入数字.

restrict属性学习.
只能输入数字.
示例：

代码：

<? xml version="1.0" encoding="utf-8" ?>
<!--  http://blog.flexexamples.com/2008/05/15/restricting-which-characters-a-user-can-type-in-a-textinput-control-in-flex/  -->
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"
        layout ="vertical"
        verticalAlign ="middle"
        backgroundColor ="white" >

     < mx:Script >
         <![CDATA[
            private function textInput_change(evt:Event):void {
                arrColl.addItem(evt);
            }
         ]]>
     </ mx:Script >

     < mx:ArrayCollection  id ="arrColl"   />

     < mx:ApplicationControlBar  dock ="true" >
         < mx:TextInput  id ="textInput"
                restrict ="0-9-"
                change ="textInput_change(event);"   />
     </ mx:ApplicationControlBar >

     < mx:DataGrid  id ="dataGrid"
            dataProvider =" {arrColl} "
            width ="100%"
            height ="100%"   />

</ mx:Application >

来自： http://blog.flexexamples.com/2008/05/15/restricting-which-characters-a-user-can-type-in-a-textinput-control-in-flex/