Flex - Button Control


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Introduction

The Button component is a commonly used rectangular button. Button typically uses event listeners to perform an action when the user selects the control. When a user clicks on a Button control, then it dispatches a click event and a buttonDown event.

Class Declaration

Following is the declaration for spark.components.Button class −

public class Button 
   extends ButtonBase
      implements IButton

Public Properties

S.No Property & Description
1

emphasized : Boolean

Reflects the default button as requested by the focus manager.

Public Methods

S.No Method & Description
1

Button()

Constructor.

Methods Inherited

This class inherits methods from the following classes −

  • 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 Button Control Example

Let us follow the following steps to check usage of Button 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" />
   <fx:Script>
      <![CDATA[
         import mx.controls.Alert;
         import mx.events.FlexEvent;

         protected function button_clickHandler(event:MouseEvent):void {
            Alert.show("Hello World!");				
         }
      ]]>
   </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 = "buttonPanel" title = "Using Button" width = "400" 
            height = "200" includeInLayout = "true" visible = "true">
            <s:layout>
               <s:HorizontalLayout  gap = "10" verticalAlign = "middle" 
                  horizontalAlign = "center" />	
            </s:layout>
            
            <s:Button id = "clickMeButton" label = "Click Me" 
               click = "button_clickHandler(event)" />
            <s:Button id = "disabledButton" label = "Disabled Button" 
               enabled = "false" />
            <s:Button id = "emphasizedButton" label = "Emphasized Button" 
               emphasized = "true" click = "button_clickHandler(event)" />
         </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 ]

Flex Button Control
flex_form_controls.htm

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