Conditional handler : Event Handler « Event « Flex

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Conditional handler
Conditional handler
            


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Code from Flex Documentation "Using Adobe Flex 4".

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<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark"
    initialize="initApp(event)">
    <s:layout>
        <s:VerticalLayout />
    </s:layout>
    <fx:Script>
         
        import mx.controls.Alert; 
        private function initApp(e:Event):void 
            cb1.addEventListener(MouseEvent.CLICK, handleCheckBoxChange)
            b1.addEventListener(MouseEvent.CLICK, logAction)
        
        private function handleCheckBoxChange(e:Event):void 
            if (cb1.selected) { 
                b1.addEventListener(MouseEvent.CLICK, logAction)
                ta1.text += "Added log listener." "\n"
            else 
                b1.removeEventListener(MouseEvent.CLICK, logAction)
                ta1.text += "Removed log listener." "\n"
            
        
        private function performAction(e:Event):void 
            Alert.show("You performed the action.")
        
        private function logAction(e:Event):void 
            ta1.text += "Action performed: " + e.type + ".\n"
        
      
    </fx:Script>
    <s:Button label="Perform Action" id="b1"
        click="performAction(event)" />
    <s:CheckBox id="cb1" label="Log?" selected="true" />
    <s:TextArea id="ta1" height="200" width="300" />
</s:Application>

   
    
    
    
    
    
    
    
    
    
    
    
  
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