如何在jQuery中识别Ajax的使用？

Question

I want to make a form that uses jQuery's ajax function to submit the data, but to be functional when javascript is disabled. So I need a way to know, in the server-side script (PHP), weather the request came from ajax or from simply submiting the form.

HTML:

<form id="form_1" method="post" action="process.php">

jQuery:

$.ajax({
        type: "POST",
        url: "process.php",
        data: $("#form_1").serialize(),
        cache: false,
        success: function(msg){alert(msg)}
    });

So I would like to check in process.php if it was called from jQuery or from submiting the form. Note that I serialize the data, I don't want to use an URL parameter, like '&ajax=1'. Thanks!

Answer 1

You can check for the presence of $_SERVER['HTTP_X_REQUESTED_WITH']. jQuery will send this header with AJAX calls.