Flex - 單選按鈕控制元件

簡介

單選按鈕控制元件允許使用者在一組互斥的選擇中做出單一選擇。

類宣告

以下是spark.components.RadioButton類的宣告：

public class RadioButton 
   extends ToggleButtonBase
      implements IFocusManagerGroup

公共屬性

公共方法

繼承的方法

此類繼承自以下類的方法：

• spark.components.supportClasses.ToggleButtonBase
• spark.components.supportClasses.ButtonBase
• spark.components.supportClasses.SkinnableComponent
• mx.core.UIComponent
• mx.core.FlexSprite
• flash.display.Sprite
• flash.display.DisplayObjectContainer
• flash.display.InteractiveObject
• flash.display.DisplayObject
• flash.events.EventDispatcher
• Object

Flex 單選按鈕控制元件示例

讓我們按照以下步驟，透過建立一個測試應用程式來檢查在 Flex 應用程式中使用RadioButton控制元件：

以下是修改後的 mxml 檔案src/com.tutorialspoint/HelloWorld.mxml的內容。

<?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:Script>
      <![CDATA[
         [Bindable]
         private var selectedOption:String = "";
         protected function option_clickHandler(event:MouseEvent):void {
            var radioButton:RadioButton = event.target as RadioButton;
            switch (radioButton.id) {
               case option1.id:
                  selectedOption = option1.label;
                  break;
               case option2.id:
                  selectedOption = option2.label;
                  break;
               case option3.id:
                  selectedOption = option3.label;
                  break;
               case option4.id:
                  selectedOption = option4.label;
                  break;
            }			
         }
      ]]>
   </fx:Script>
   
   <s:BorderContainer width = "550" height = "400" id = "mainContainer" 
      styleName = "container">
      <s:VGroup width = "100%" height = "100%" gap = "50" 
         horizontalAlign = "center" verticalAlign = "middle">
         <s:Label id = "lblHeader" text = "Form Controls Demonstration" 
            fontSize = "40" color = "0x777777" styleName = "heading" />
         
         <s:Panel id = "radioButtonPanel" title = "Using RadioButton" 
            width = "420" height = "200" >
            <s:layout>
               <s:VerticalLayout  gap = "10" verticalAlign = "middle"
                  horizontalAlign = "center" />	
            </s:layout>
            
            <s:RadioButton groupName = "options" id = "option1" 
               label = "item #1" width="150" 
               click = "option_clickHandler(event)" />
            <s:RadioButton groupName = "options" id = "option2" 
               label = "item #2" width="150" 
               click = "option_clickHandler(event)" />
            <s:RadioButton groupName = "options" id = "option3" 
               label = "item #3" width="150" 
               click = "option_clickHandler(event)" />
            <s:RadioButton groupName = "options" id = "option4" 
               label = "item #4" width = "150" 
               click = "option_clickHandler(event)" />
            <s:Label id = "selectedOptionLabel" fontWeight = "bold" 
               text = "Item selected: {selectedOption}" width = "150" />
         </s:Panel>
      </s:VGroup>	 
   </s:BorderContainer>	
</s:Application>

完成所有更改後，讓我們像在Flex - 建立應用程式章節中一樣，在普通模式下編譯並執行應用程式。如果您的應用程式一切正常，它將產生以下結果：[ 線上嘗試 ]