Posting screen width using jQuery

Question

Using this code

var sw = window.screen.width;
$.post("http://www.example.com/track.php", {result: sw
}, "html");

and $_SERVER['result']; in the server I'm trying to get the sreen width but it does not work. It is something wrong with the "result". I'm new in Javascript and jQuery...

http://api.jquery.com/jQuery.post/

Answer 1

$_SERVER contains server variables, that is, things like the operating system, the referrer URL, paths to various folders on the server.

What you're looking for instead is either the $_POST array, the $_GET array, or the $_REQUEST array. I might be stating the obvious here, but here's what they contain:

• $_POST contains a list of all variables POSTed to the script.
• $_GET contains a list of all variables in the query string (eg: someScript.php?x=1&y=2)
• $_REQUEST contains a merge of $_POST, $_GET and $_COOKIE (usually in that order). I don't recommend using this: you should know the methods you're using to get variables into your script and use that array specifically.

In your case, you need to take a look at the $_POST array. It's always handy to run this once:

print_r($_POST);

This will show you everything posted to that page.

Answer 2

The jQuery $.post function sends a post request to the server, which means to access the value of "result", you need to get it from the $_POST superglobal.

Try $_POST['result'] instead of $_SERVER['result'].

These descriptions may help (source: http://www.nusphere.com/php/php_superglobals.htm):

• $_POST- The $_POST Superglobal represents data sent to the PHP script via HTTP POST. This is normally a form with a method of POST.
• $_SERVER- The $_SERVER Superglobal represents data available to a PHP script from the Web server itself (not what you're looking for)
• $_REQUEST- The $_REQUEST Superglobal is a combination of $_GET, $_POST, and $_COOKIE (would work, but why search GET and COOKIE when you know the value is in POST?)

Answer 3

Try doing:

echo $_POST['result'];

Answer 4

Use $_REQUEST['result']

$_SERVER is an array containing information such as headers, paths, and script locations. The entries in this array are created by the web server. There is no guarantee that every web server will provide any of these; servers may omit some, or provide others not listed here.

$_REQUEST is an associative array that by default contains the contents of $_GET, $_POST and $_COOKIE.

The correct way is to use $_POST['result'], as suggested by others here.