Form

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2023-12-01

介绍 (Introduction)

Form容器允许您控制表单的布局，根据需要或可选标记表单字段，处理错误消息，以及将表单数据绑定到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来配置表单的外观。

Class 声明 (Class Declaration)

以下是spark.components.Form类的声明 -

public class Form 
   extends Container

公共属性 (Public Properties)

S.No	财产和描述
1	invalidElements : Array [只读]处于无效状态的已排序元素的已排序数组。

公共方法 (Public Methods)

S.No	方法和描述
1	Form() 构造函数。

方法继承 (Methods Inherited)

该类继承以下类中的方法 -

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 Form示例

让我们按照以下步骤通过创建测试应用程序来检查Flex应用程序中Form的用法 -

步	描述
1	在cn.xnip.client包下创建一个名为HelloWorld的项目，如Flex - Create Application一章中所述。
2	修改HelloWorld.mxml ，如下所述。保持其余文件不变。
3	编译并运行应用程序以确保业务逻辑按照要求运行。

以下是修改后的mxml文件src/cn.xnip/HelloWorld.mxml 。

<?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/xnip/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>

一旦准备好完成所有更改，让我们像在Flex - Create Application章节中那样在正常模式下编译和运行应用程序。