Increment global variable on click in flash, actionscript 3

Question

Hi,

Making a flash page that can cycle through these three images on mouseclick. For some reason the local changes to count are not reflected on the global one. I tried _global but the syntax was odd and gave me errors. How should I implement this?

import flash.events.Event;

var images:Array = ["images/image.jpg", "images/image2.jpg", "images/image3.jpg"];
var count:int = 0;

forward.addEventListener(MouseEvent.CLICK, loadPhoto);


function loadPhoto(evt:Event){

    if(count>2){
        count = 0;
    }

    trace(count);
    imageFrame.source = images[count];

    count++;

}

A simplified version of the problem would be getting trace to output the number of times you've clicked.

import flash.events.Event;

var count:int = 0;

forward.addEventListener(MouseEvent.CLICK, clickHandler);

function clickHandler(evt:Event)
{
    trace(count);
    count++; 
}

Answer 1

This should work fine. I'm assuming by the way the code is written, this is on the timeline and not in a class. It shouldn't make any difference -

However try referencing the "count" variable inside your function with the this

It may look something more like:

function loadPhoto(evt:Event){

    if(this.count>2){
        this.count = 0;
    }

    trace(this.count);
    imageFrame.source = images[this.count];

    this.count++;

}

It's more verbose and pedantic, but your initial code should work just fine. I might add - this code doesn't use the 'count' variable outside the function, alternative to declaring it - is the problem, the counter is always '0' when the function is run?

Answer 2

I think your issue is a scope one. Try this instead:

import flash.events.Event;

var images:Array = ["images/image.jpg", "images/image2.jpg", "images/image3.jpg"];
var count:int = 0;

forward.addEventListener(MouseEvent.CLICK, clickHandler);


function clickHandler(evt:Event)
{
    loadPhoto(); // Notice, this is calling a function already defined on root!
}

function loadPhoto()
{
    trace(count);
    // Use modulous to deal with this type of behavior -- it is easier in the end.
    imageFrame.source = images[count%images.length];

    count++; // Count should be within scope here.
}

Answer 3

Any chance that the code is in a frame that is executing multiple times? (because you missed a stop() somewhere, for example)

If so, you might have a problem you hadn't noticed which is causing this strange behaviour. A simple way to check if this is happening is adding a trace("test") after declaring count (or before, but put it in that frame script).

Answer 4

How do you program it so it counts in 2s? (ie, 0, 2, 4, 6, etc)?