Passing Javascript variable

[Anon]

I'm trying to pass the screenwidth from one page another. I've tried with a hidden form but can't get it to work.
The script I use looks something like this:

<script language="JavaScript">
document.write(screen.width);
</script>

I know I can pass it with the URL, but I'd rather not, can I send it ti the destination page directly through the form?

I'm a php-beginner so I'm not "at home" with it yet.

Thanks a bunch

[sarahk]

the key is how your user moves from one page to the next. Is it with a hyperlink? If so it's a bit more difficult.

The easiest way would be to use your hidden form but to have the hyperlink or button submit the form (use post not get) and the values will go with the form.

[Anon]

The user is sent to the next page with a
<META HTTP-EQUIV="Refresh" CONTENT="0;url=my_url.php4"> tag.

the form I've been working on is using post, but I can't get i to work. The variable is sent to the next page, but it's empty.

[Anon]

What about just starting a session and storing it in there?

[Anon]

Can't say I know what you mean by that.

[Anon]

I don't quite understand.

After submitting the form, does it go to my_url.php4?

Because that meta refresh tag doesn't seem to make any sense.

If I get the intended purpose of your script, it's to get the screen width, and then send the user to a page set up for their screen width.

If you put the screen width in a form element, you'd have to automatically submit the form.

This is what I might do:

function DoSomething()
{
document.theForm.screenWidth.value = screen.width; //or whatever the syntax is. My JS is a little rusty. screenWidth could be a hidden element the theForm form.
document.theForm.submit();//automatically submit the form.
}

and then stick the DoSomething function in an onLoad event handler in the body tag.

Hope that helps.

[Anon]

Any JS variable is lost when you leave the page, since JS is client side.

PHP variables are passed along via the HTTP_GLOBAL_VARS array or something. Check the docs.

PHP 4.0+ makes session variables available as well, sort of like global variables in VB or C++. And they do work, with proper management, and it sure beats passing all those hidden variables around.

[Anon]

hmm, alright, I guess I'll have to send it with the URL then, but I haven't got the slightest idea how that works.

say I've got a javascript looking like this

<script language="javascript">
var width = screen.width;
</script>

how would I do to send that variable to the next page while redirecting to that page, without user interaction?

thanks.