Passing Variables to A Function in ActionScript 3

I have asked and have been asked, “How do I pass a variable to a function when using the addEventListener to call a function in ActionScript 3?”

Passing a variable to a function in ActionScript 2 was a fairly simple task. However, it is not so easy using ActionScript 3. There are a few more things you must do first.

In ActionScript 2, passing a string variable looked like this.

my_btn.onRelease = function(){
doThis("whatever variable you want goes here");
}

function doThis(a:String){
trace(a);
}

In ActionScript 3, this is what I need to do to get the same results.  I initially wrote the example below thinking at some point, I will have several buttons that the user will interact with such as a navigation menu.

var b:Array = [b1_btn, b2_btn, b3_btn];
var a:Array = ["zero","one","two"];

for (var i:int = 0; i<b.length; i++) {

b[i].addEventListener(MouseEvent.CLICK, clickedOne);
function clickedOne(e:MouseEvent):void {
for (var j:int = 0; j<a.length; j++) {
if (e.currentTarget.name == b[j].name) {
doThis(a[j])
}
}
}
}

function doThis(v:String):void {
trace(v);
}

Get the source fla file here.

If you have any questions just drop me a line.

UPDATE!!!

There’s more than one way to solve this problem.

Thanks to kcreation for this solution.

var btns:Array = [b1_btn, b2_btn, b3_btn];
var a:Array = ["zero","one","two"];

for (var b in btns) {
btns[b].name = b;
btns[b].addEventListener(MouseEvent.CLICK, clickedOne);
}

function clickedOne(e:MouseEvent):void {
var b:int = int(event.currentTarget.name);
doThis(a[b]);
}

function doThis(v:String):void {
trace(v);
}

Thanks to Mykola Bilokonsky for this solution.

var buttons:Array = [b1_btn, b2_btn, b3_btn];

var dict:Dictionary = new Dictionary();
dict[b1_btn] = “String Argument”;
dict[b2_btn] = new MySampleMovieClip();
dict[b3_btn] = 7

for each (var b:MovieClip in buttons) {
b.buttonMode = true;
b.addEventListener(MouseEvent.CLICK, myHandler);
}

function myHandler(e:MouseEvent):void {
var myVariable = dict[e.currentTarget];
}

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You’re currently reading “Passing Variables to A Function in ActionScript 3,” an entry on homer gaines

Published:
11.07.08 / 4pm
Category:
ActionScript 2.0, ActionScript 3.0, Flash, Resources