About Global variables

**fuadr** · 08-12-2009 04:12 PM

I have a question about global variable behavior in js.
I have a script running inside a div (id1) that gets a variable from a php file.
I have another script in a different div (id2) where I check for that variable's values.

Except in the second div the variable loses its value.

**fuadr** · 08-12-2009 04:16 PM

I have tried using the window.myVariable statment as well.

**criterion9** · 08-12-2009 11:11 PM

You'll need to post some code before anyone will be able to help you. There just isn't enough information given to make an educated guess or wave a magic wand to fix it.

**fuadr** · 08-13-2009 04:34 PM

<div id = "moduleX">

<script type="text/javascript">

var ft = 1;
ft = 1;
function runs() {
ft = ft + 1;
}

window.onload = function () {
runs();
};
</script>

</div>

<div id = "moduleY">

<script type="text/javascript">

document.write(ft);

</script>
</div>

The result should be 2. but it is not.

**thraddash** · 08-13-2009 05:25 PM

Your getting the number 1 because document.write(ft); is being executed before window.onload. window.onload runs only when the page has finished loading.

**Nedals** · 08-13-2009 06:30 PM

Code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html lang="en">
<head><title>untitled</title>
<script type="text/javascript">
// Move ft into the <head> section and you don't need to set it to 1 twice
var ft = 1;
</script>
</head>

<body>

<div id = "moduleX">
<script type="text/javascript">
function runs() {
	ft++;  // same as ft = ft+1;
}
// You don't need the onload function in this case. runs() gets called as this
// div is loaded
runs();
</script>
</div>

<div id = "moduleY">
<script type="text/javascript">
	document.write(ft);
</script>
</div>

</body>
</html>

**fuadr** · 08-13-2009 06:31 PM

thanks Dash, erm... what about setTimeout? XMLHttpRequest() Object? do these run after page has finished loading?

**fuadr** · 08-13-2009 06:38 PM

Thank you Nedals.

Thread: About Global variables

Thread Tools

Display

About Global variables

Thread Information

Users Browsing this Thread

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions