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setTimeout and global vars

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Apr 05.2006

Hello fellow web developers!

In connection with an ajax-game I’m creating for the moment, I have been running into a problem using setTimeout().

Even though I call setTimeout from inside af member of an object it uses global variables. This is very annoying! ?

The problem occurs for example when I’m using my “fader-function” (a function that fades html-elements in/out) on several elements at a time:

[code=html]for(i=1; 5>=i; i++) {
opacity = (fade_to == ‘1’) ? i/5 : 1-i/5;
setTimeout(“document.getElementById(‘” + obj_id + “‘).style.opacity = “+opacity, (i-1)*40);
}[/code]

The opacity-var and the obj_id var will be affected from other instances of the function if to faders are running simultaenously. This results in weird results – the elements are blinking instead fading nice and slow.

Am I using the setTimeout-function in a stupid way or what? What is the easiest way out of this? Suggestions are very welcome.

Thank you,
Rasmus

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JavaScript

1 Comments(s) ↴

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@phpnoviceApr 05.2006 — You should have a separate, asynchronous function that performs the fade through an argument parameter that the function passes to itself through multiple iterations using the [b]setTimeoutp[/b] method. You start it as follows:

window.setTimeout("MyFader('" + obj_id + "')", 10);

Then this function iterates itself, again via setTimeout, passing two arguments to itself. No global variables required.
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