Php – How to check if the request is made via AJAX in CodeIgniter

ajaxcodeigniterPHP

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.

Best Answer

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!
}

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Here's what your code would look like if changed as suggested:

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Javascript – How to manage a redirect request after a jQuery Ajax call

I read this question and implemented the approach that has been stated regarding setting the response HTTP status code to 278 in order to avoid the browser transparently handling the redirects. Even though this worked, I was a little dissatisfied as it is a bit of a hack.

After more digging around, I ditched this approach and used JSON. In this case, all responses to AJAX requests have the status code 200 and the body of the response contains a JSON object that is constructed on the server. The JavaScript on the client can then use the JSON object to decide what it needs to do.

I had a similar problem to yours. I perform an AJAX request that has 2 possible responses: one that redirects the browser to a new page and one that replaces an existing HTML form on the current page with a new one. The jQuery code to do this looks something like:

$.ajax({
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        } else {
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        }
    }
});

The JSON object "data" is constructed on the server to have 2 members: data.redirect and data.form. I found this approach to be much better.