Flex - 表单

介绍

表单容器允许您控制表单的布局，将表单字段标记为必填或可选，处理错误消息，并将表单数据绑定到 Flex 数据模型以执行数据检查和验证。它还允许您使用样式表配置表单的外观。

类声明

以下是 **spark.components.Form** 类的声明：

public class Form 
   extends Container

公共属性

公共方法

继承的方法

此类继承自以下类：

• mx.core.Component
• mx.core.UIComponent
• mx.core.FlexSprite
• flash.display.Sprite
• flash.display.DisplayObjectContainer
• flash.display.InteractiveObject
• flash.display.DisplayObject
• flash.events.EventDispatcher
• Object

Flex 表单示例

让我们按照以下步骤检查在 Flex 应用程序中使用表单的方法，方法是创建一个测试应用程序：

以下是修改后的 mxml 文件 **src/com.tutorialspoint/HelloWorld.mxml** 的内容。

<?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
   width = "100%" height = "100%" minWidth = "500" minHeight = "500">  
   
   <fx:Style source = "/com/tutorialspoint/client/Style.css" />
   <fx:Declarations>
      <mx:StringValidator source = "{fname}" property = "text" 
         minLength = "4" maxLength = "12" />
      <mx:PhoneNumberValidator source = "{phone}" property = "text" />
      <mx:EmailValidator source = "{email}" property = "text" />
   </fx:Declarations>
   
   <s:BorderContainer width = "630" height = "480" id = "mainContainer" 
      styleName = "container">
      <s:VGroup width = "100%" height = "100%" gap = "50" 
         horizontalAlign = "center" verticalAlign = "middle">
         <s:Label id = "lblHeader" text = "Layout Panels Demonstration" 
            fontSize = "40" color = "0x777777" styleName = "heading" />
         
         <s:Panel id = "formPanel" title = "Using Form"
            width = "500" height = "300" 
            includeInLayout = "true" visible = "true">
            
            <s:Form >						
               <s:FormItem label = "First name">
                  <s:TextInput id = "fname" width = "200" />
               </s:FormItem>
               
               <s:FormItem label = "E-mail">
                  <s:TextInput id = "email" width = "200" />
               </s:FormItem>
               
               <s:FormItem label = "Phone">
                  <s:TextInput id = "phone" width = "200" />
               </s:FormItem>
            </s:Form>
         </s:Panel>
      </s:VGroup>	 
   </s:BorderContainer>	
</s:Application>

准备好所有更改后，让我们以正常模式编译并运行应用程序，就像我们在“Flex - 创建应用程序”一章中所做的那样。如果您的应用程序一切正常，它将产生以下结果：[在线尝试]