Ajax post not sending

I am trying to submit form data through an ajax request in my plugin but cant seem to get the post to send. Here is the post code:

jQuery.ajax({

					type:"post",
					dataType:"json",
					url: myAjax.ajaxurl,
					data: {action: 'submit_data', info: info},
					success: function(response) {
						if (response.type == "success") {

							alert("Success");
						}
						else  {

							alert("Fail");
						}
					}
				});

And this is the function it should send the data to:

add_action("wp_ajax_submit_data", "submit_data");
	add_action("wp_ajax_nopriv_submit_data", "submit_data");

	function submit_data() {

		echo "<script> alert('hello'); </script";
		header("Location: ".$_SERVER["HTTP_REFERER"]);

		die();
	}

Upon submitting the data the javascript runs however when it gets to the ajax post nothing seems to happen, I do not get a ‘fail’, ‘success’ or ‘hello’ alert.