Flex - RadioButton Control
Introduction
The RadioButton control allows the user make a single choice within a set of mutually exclusive choices.
Class declaration
Following is the declaration for spark.components.RadioButton class:
public class RadioButton
extends ToggleButtonBase
implements IFocusManagerGroup
Public properties
| S.N. | Properties & Description |
|---|---|
| 1 | enabled : Boolean [override] The RadioButton component is enabled if the RadioButtonGroup is enabled and the RadioButton itself is enabled. |
| 2 | group : RadioButtonGroup The RadioButtonGroup component to which this RadioButton belongs. |
| 3 | groupName : String Specifies the name of the group to which this RadioButton component belongs, or specifies the value of the id property of a RadioButtonGroup component if this RadioButton is part of a group defined by a RadioButtonGroup component. |
| 4 | value : Object Optional user-defined value that is associated with a RadioButton component. |
Public methods
| S.N. | Method & Description |
|---|---|
| 1 | RadioButton() Constructor. |
Methods inherited
This class inherits methods from the following classes:
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 RadioButton Control Example
Let us follow the following steps to check usage of RadioButton control in a Flex application by creating a test application:
| Step | Description |
|---|---|
| 1 | Create a project with a name HelloWorld under a package com.tutorialspoint.client as explained in the Flex - Create Application chapter. |
| 2 | Modify HelloWorld.mxml as explained below. Keep rest of the files unchanged. |
| 3 | Compile and run the application to make sure business logic is working as per the requirements. |
Following is the content of the modified mxml file src/com.tutorialspoint/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/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>
Once you are ready with all the changes done, let us compile and run the application in normal mode as we did in Flex - Create Application chapter. If everything is fine with your application, this will produce following result: [ Try it online ]
