Scope access and Event Handling

10/13/2007 08:21 pm by Journal in Actionscript 3.0
Here's a little hack a use when I'm using when I need to an event handler to access variables or object in a particular function scope. 
import flash.events.MouseEvent;

var clickHandler : Function;

function foo() : void
{
        var firstName : String = "Samuel"
        var lastName : String = "Agesilas";
        
        this.stage.addEventListener(MouseEvent.CLICK, clickHandler = function(event:Event) : void
        {
                trace( event );
                trace( "First Name:" + firstName );
                trace( "Last Name:" + lastName );
        });
}
foo();
By creating a variable ('clickHandler') outside of the current function scope (in this case the function 'foo') we have a safe place to store the function handler and it can be removed at a later point in time if necessary. The biggest advantage here is that now the 'clickHandler' has access to all of the variables and objects inside of my current function scope making event handling a lot easier and with less code.

cheers!
Sam

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