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.No Method & Description
1

CheckBox()

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 −

Step Description
1 Create a project with a name HelloWorld under a packagecom.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" />
   <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, it will produce the following result: [ Try it online ]

CheckBox Control
flex_form_controls.htm

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