How can i define an ActionScript event handler function inline in AddEvent Listener

Question

I have an action listener :

myText.addEventListener(TextEvent.LINK,linkClickHandler);

As according to this, i need to write an event handler function seperate to handle the text link event.

Now my requirement is i need to write that function in the same line isntead of giving its name.ie, something like

mytext.addEventListenet(TextEvent.LINK, 
                 function(event:TextEvent) {....code comes here....});

can i do like this in AS3.What will the syntax for this if possible.

Also i want to know, wether i can pass one more extra param to the event handler other than event which is the default parameter.

Sorry for the vague comment, but I once read that there was a bug with this. Can anybody verify that? — Mike Moore
– Mike Moore, Commented Jun 23, 2010 at 5:49
Depending on the specific case, you have to make sure your dynamic function doesn't get garbage collected before it's invoked. Usually, you're better off registering the function somehwere. — Glenn
– Glenn, Commented Jun 23, 2010 at 5:52
my probelm is i need to pass a parameter to the event handler while declaring it in action listner.If i am able to do that, i can define the handler somewhere else also. — Wind Chimez
– Wind Chimez, Commented Jun 23, 2010 at 5:55

Glenn · Accepted Answer · 2010-06-23 06:00:02Z

4

Your code will work. Just need a return type on the function.

EDIT: A simple delegate class:

public class Delegate
{

    public var cb:Function;
    public var args:Array;

    public function Delegate(cb:Function, ...args)
    {
        this.cb = cb;
        this.args = args;
    }

    public static function create(cb:Function, ...args):Function {
        var functionProxy:Delegate = new Delegate(cb, args);
        return functionProxy._create;
    }

    public function _create(e:Object=null):void {
        var params:Array = new Array();
        if(e) {
            params.push(e);
        }

        for each (var o:Object in args[0]) {
            params.push(o);
        }
        cb.apply(null, params);
    }

}

edited Jun 23, 2010 at 6:00

answered Jun 23, 2010 at 5:48

Glenn

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7 Comments

Wind Chimez Over a year ago

can i pass one extra parameter to the function while declaring in action listener

Glenn Over a year ago

You'll need to do something like a Delegate class: actionscript.org/resources/articles/205/1/The-Delegate-Class/….

Wind Chimez Over a year ago

That's a great reference. thanks buddy. Also the code worked inline as well. Now i have two good options. Cool

Glenn Over a year ago

Actually, that example is old and not exactly what I wanted.

Wind Chimez Over a year ago

I wonder if there is a way exist like "addEventlistener(handlerName,{parameters},..). If that is possible, thats the best.

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