How to pass params to static callback function? - actionscript-3

Question

I have code
MergeTool.as:
private static function askFromUser(cardId:uint, field:String, mainValue:*, addValue:*):void {
WindowManager.instance.showQuestionPopup({
message: "Client " + cardId + " has duplicate values. Do you want to replace" + mainValue + " to " + addValue,
id:cardId,
field:field,
value:addValue
}, okCallback);
}
private static function okCallback(p:*):void {
trace("ok", p.message);
}
QuestionPopup.as :
private function onClick(event:MouseEvent):void {
if(_ok) _ok.call(params);
}
When I press "Yes" it trows an error :
Error #1063: Argument count mismatch on core::MergeTool$/okCallback(). Expected 1, got 0.
But, if I use anonymous callback with 0 arguments - it works properly :
WindowManager.instance.showQuestionPopup({
message: "Client " + cardId + " has duplicate values. Do you want to replace" + mainValue + " to " + addValue,
id:cardId,
field:field,
value:addValue
}, function (){
trace("ok", this.message);
});
It returns params object, that I pass to WindowManager.instance.showQuestionPopup(params, callback) and I can access it with "this" inside anonymous fucntion.
I think 1 variant doesn`t wokr because of static. How to fix 1 variant, because 2 is non intuitive?

Answer 1

The function.call() method doesn't pass parameters, the argument is to tell what object this should refer to.
Instead, you should use the function.apply(context, parameter array) method. It takes the same first parameter as the call method, but then the second parameter takes an Arrayand applies each element of the array as an argument to the function you want to call. So for you, it should look like this:
private function onClick(event:MouseEvent):void {
if(_ok != null) _ok.apply(this, [params]);
}
To illustrate, let's say you have the following function that requires 3 parameters:
function test(p1:Number, p2Number, p3:Number){
}
The following two lines are exactly the same:
test(1,2,3);
test.apply(this, [1,2,3]);