Custom Listener Function

            

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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"
    creationComplete="initApp(event)">
    <s:layout>
        <s:VerticalLayout />
    </s:layout>
    <fx:Script>
         
        private var specialParam1:String; 
        private var specialParam2:String = "42"; 
        private function initApp(e:Event):void { 
            assignSpecialParam(e); 
            ti1.addEventListener("focusOut", assignSpecialParam); 
            myButton.addEventListener(MouseEvent.CLICK, function (e:MouseEvent):void { 
                myClickListener(e, specialParam1, specialParam2); 
            }); 
        } 
        private function assignSpecialParam(e:Event):void { 
            specialParam1 = ti1.text; 
        } 
        /* This method acts as the event listener, and it has any 
        number of parameters that we defined in the addEventListener() call. */ 
        private function myClickListener(e:MouseEvent, s1:String, s2:String) : void { 
            myButton.label = s1 + " " + s2; 
        } 
      
    </fx:Script>
    <s:Button id="myButton" label="Click Me" />
    <s:TextInput id="ti1" text="Enter a custom String here."
        width="250" />
</s:Application>

1.	Add Click event listener with ActionScript
2.	Remove and add event listener
3.	Register one listener function to two different buttons
4.	Use the addEventListener() method
5.	Pass individual properties to an event listener
6.	Use a separate call to addEventListener() method for each instance
7.	Event listener is contained in an ActionScript function in an tag
8.	Event listener function
9.	Reuse a single listener for multiple events
10.	Use addEventListener function to bind function to event
11.	Add a click event listener to each of the colored boxes
12.	Using Add Event Listener

Custom Listener Function : Event Listener « Event « Flex

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