You can't pass a reference to a method call like you seem to be trying to do by
'bar.doLast'. You *can* pass functions around, but not object methods -- they
no longer know what object they are supposed to act on.
See:
var a:Array = [1, 2, 3];
a.shift(); // a = [2, 3];
var shiftMethod:Function = a.shift;
shiftMethod(); // a still equals [2, 3] - this did nothing
One solution would be something like this:
public function doFirst(aString:String, aBarInstance:Bar,
aBarMethodName:String) {
trace("the first string is "+aString);
aBar["aBarMethodName"]();
}
This is pretty nasty, though. You should probably let us know what the effect
you are going for is so someone can suggest a better way, probably involving
either untangling these two objects or using mx.utils.Delegate.
-mark hawley
>
> From: "Elie Zananiri" <[EMAIL PROTECTED]>
> Date: 2006/06/29 Thu PM 02:21:47 CDT
> To: [email protected]
> Subject: [Flashcoders] trying to call a function passed as an argument
>
> Hi all,
>
> I have this method where I need to call a function passed as an argument
> (kind of like in setInterval()) and I don't understand the documentation and
> can't get it to work.
>
> First of all, I don't understand how to pass the function as a parameter.
> Am I passing a String or an actual Function object? Can I pass a Function
> with parameters? Do I have to write the parentheses in the parameter?
>
> Next, how do I call this function? The Function.call() function requires a
> parameter but I don't get what it does...
>
> Thanks for the help!
>
> -Elie
>
> Here is the structure I have:
>
> class Bar {
> public Bar() {
> }
>
> public function doLast(bString:String) {
> trace("the second string is "+bString);
> }
> }
>
> class Foo {
> var bar:Bar;
>
> public Foo() {
> bar = new Bar();
> doFirst("hello", "world", bar.doLast);
> }
>
> public function doFirst(aString:String, bString:String,
> aFunction:Function) {
> trace("the first string is "+aString);
>
> // call the second function here ???
> aFunction.call(??);
> }
> }
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--
John Mark Hawley
The Nilbog Group
773.968.4980 (cell)
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