Get JavaScript in php

[Anon]

I need to get the javascript variable document.body.clientWidth passed into a php variabel. I know how to do this in form, refreshing page or cookies, BUT I need that the browser find it onload.

So when the user enters the page I will automaticly get their brower width into php so I can use it in forinstance <form width=$var> and some special php functions I'm making.

One thing I tryed to do was to use this code in php and then try and assign the print "document.write(document.body.clientWidth)\n"; into a php variable, but that doesnt seem to work.

/
print "<script type=\"text/javascript\">\n";
print "<!--\n";
print "document.write(document.body.clientWidth)\n";
print "-->\n";
print "</script>\n";
/

Did anyone understand my problem? 🙂

Thanks
aCa

[Anon]

Of course it does not work.

PHP is server-side. Javascript is client-side.

All PHP processing is finished before the browser encounters the Javascript.

It is simple for PHP to pass information into a chunk of Javascript, but Javascript cannot pass information back upstream in the same page context.

Javascript variables CAN be passed back to the server, of course, in the context of a page refresh or a cookie, but in that instance, you actually are making the information available to PHP for generating a completely new page.