To pass a parameter to event listener in AS3 the simple way… does it exist?

Question

Expected / pseudo example:

stage.addEventListener(MouseEvent.CLICK, onClick.someWayToPassParameters(true, 123, 4.56, "string"));
function onClick(e:         


        

Answer 1

I would modify Creynders example slightly:

    protected function createHandler(handler:Function, ...args):Function
    {
        var h:Function = function(e:Event = null):void
        {
            trace(args);

            if (handler != null)
                handler(e);
        }
        return h;
    }

    sm.addEventListener(StyleEvent.STYLE_CHANGE, 
            createHandler(updateStyle, 1,true,"Lorem",["a","b","c"]), 
            false, 0, true);

this way you can use original event handlers and inject the "arguments" to it,

also you could have your handlers to have following signature:

protected function myHandler(e:Event, ...args):void;

then you could pass arguments directly to the target handler:

    protected function createHandler(handler:Function, ...args):Function
    {
        var h:Function = function(e:Event = null):void
        {
            //trace(args);

            if (handler != null)
            {
                args.unshift(e);
                handler.apply(this, args);
            }
        }
        return h;
    }

best regards