How do I check if the request is made via AJAX in CodeIgniter?

Question

How do I check if the request is an AJAX? I am using CodeIgniter. I have a link that when it clicked, it'll open the pop-up dialog window this is done through ajax it requests to a controller name login_window().

CodeIgniter

//Here is the controller name: function login_window(){     // request via ajax     $this->load->view("login_window"); } 

jQuery

//here is the jquery code: //I am using a jquery plugin FACEBOX  $('a[rel*=dialog]').facebox();  <a href="http://localhost/codeigniter/login_window" rel="dialog">Login</a> 

I want to check if it is an AJAX request and if not, i will redirect them to homepage. so there's no way they can access the page that is intended only for ajax requests.

Answer 1

If you are using a library that sends the X-Requested-With header, then you can do...

if (strtolower(filter_input(INPUT_SERVER, 'HTTP_X_REQUESTED_WITH')) === 'xmlhttprequest') {    // I'm AJAX! }