Flex - CheckBox Control

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Introduction

The CheckBox component represents a checkbox and an optional label.When a user clicks a CheckBox component or its text, then CheckBox component sets its selected property to true for checked, and to false for unchecked.

Class declaration

Following is the declaration for spark.components.CheckBox class:

public class CheckBox 
   extends ToggleButtonBase

Public methods

S.N.Method & Description
1CheckBox()
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 CheckBox Control Example

Let us follow the following steps to check usage of CheckBox control in a Flex application by creating a test application:

StepDescription
1Create a project with a name HelloWorld under a package com.tutorialspoint.client as explained in the Flex - Create Application chapter.
2Modify HelloWorld.mxml as explained below. Keep rest of the files unchanged.
3Compile 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"/>
   <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="checkBoxPanel" title="Using CheckBox" width="420" 
         height="200" >			
            <s:layout>   
               <s:VerticalLayout  gap="10" verticalAlign="middle" 
               horizontalAlign="center"/>	
            </s:layout>
            <s:CheckBox id="chkBox" label="Checked by default" 
            selected="true" width="50%"/>
            <s:CheckBox id="chkBox1" label="Checked,Disabled" 
            selected="true" enabled="false" width="50%"/>
            <s:CheckBox id="chkBox2" label="UnChecked" width="50%"/>
            <s:CheckBox id="chkBox3" label="UnChecked,Disabled" 
            enabled="false" width="50%"/>
         </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 ]

CheckBox Control

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