flex中的验证

 

<?xml version="1.0" encoding="utf-8"?><s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"    xmlns:s="library://ns.adobe.com/flex/spark"    xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"   creationComplete="this.txt_uname.setFocus();"   defaultButton="{val_but}"   ><fx:Style>@namespace s "library://ns.adobe.com/flex/spark";@namespace mx "library://ns.adobe.com/flex/mx";.errorTip{font-size:14px;color: red;}mx|FormItem {font-size:14px;}</fx:Style><s:layout><s:BasicLayout/></s:layout><fx:Script><![CDATA[import mx.controls.Alert;import mx.events.ValidationResultEvent;import mx.validators.Validator;protected function button1_clickHandler(event:MouseEvent):void{var d1:Number =  Date.parse(txt_df1.selectedDate);var d2:Number =  Date.parse(txt_df2.selectedDate);if(d1 >= d2) {Alert.show("结束日期必须大于开始日期");}}function doDcdate(date:Date):void{txt_uname.text = "当前时间： " + date.getFullYear() + "年" + (date.getMonth()+1) + "月" + date.getDate()+"日";}protected function v1_validHandler(event:ValidationResultEvent):void{//Alert.show("成功");}protected function v1_invalidHandler(event:ValidationResultEvent):void{//Alert.show("失败");}protected function val_but_clickHandler(event:MouseEvent):void{var errorArr:Array = Validator.validateAll([v1, v2]);if(errorArr.length > 0) {Alert.show("表单信息输入有误！");}}]]></fx:Script><fx:Declarations><!-- source: 对那个输入控件验证property="text": 对text属性内容验证trigger: 指定执行的触发控件（通常是按钮）triggerEvent: 接受触发类型（事件）required: 非空valid: 事件，在验证成功后自动触发inValid: 事件，在验证失败后自动触发--><mx:StringValidator id="v1" source="{txt_uname}" property="text"trigger="{val_but}" triggerEvent="click"required="true" maxLength="6" requiredFieldError="用户名必须填写，嘿嘿！"valid="v1_validHandler(event)" invalid="v1_invalidHandler(event)"/><mx:EmailValidator id="v2" source="{txt_uemail}" property="text"   trigger="{val_but}" triggerEvent="click" required="true" /></fx:Declarations><mx:Form><mx:FormItem label="用户名" required="true"><s:TextInput  id="txt_uname"/></mx:FormItem> <mx:FormItem label="密码"><s:TextInput  id="txt_upwd" displayAsPassword="true"/></mx:FormItem><mx:FormItem label="email"><s:TextInput  id="txt_uemail"/></mx:FormItem><mx:FormItem label="日历控件"><mx:DateField id="txt_df1" formatString="YYYY-MM-DD" width="200"/></mx:FormItem><mx:FormItem label="日历控件"><mx:DateField id="txt_df2" formatString="YYYY-MM-DD" width="200"/></mx:FormItem><mx:FormItem label="日历控件"><mx:DateChooser id="txt_dc" change="doDcdate(this.txt_dc.selectedDate)"/></mx:FormItem><s:Group><s:layout><s:HorizontalLayout/></s:layout><s:Button label="比较日期" click="button1_clickHandler(event)"/><s:Button label="验证" id="val_but" click="val_but_clickHandler(event)"/></s:Group></mx:Form></s:Application>