AJAX:将数据POST到不同的url

我正在创建一个事件注册页面。

在此页面上，用户需要能够搜索数据库项目，以便将其注册到此事件。因此，POST请求必须提交到与用户所在的URL不同的URL，这样它就不会干扰表单向导序列。

这是我的javascript：

(document).ready(function() {
    $('#primary_artist_lookup').on('input', function(){
        console.log("Listener success");
        var searchItem = $('#primary_artist_lookup').val();
        $.ajax({
                url : $('#lookupLink').val(),
                type : "POST", //http method
                data : searchItem,
                dataType: "json",
                // handle a successful response
                success : function (json) {
                    console.log(json); // log the returned json to the console
                    console.log("success"); // another sanity check
                },
                // handle a non-successful response
                error : function(xhr,errmsg,err) {
                    $('#results').html("<div class='alert-box alert radius' data-alert>Oops! We have encountered an error: "+errmsg+
                        " <a href='#' class='close'>&times;</a></div>"); // add the error to the dom
                    console.log(xhr.status + ": " + xhr.responseText); // provide a bit more info about the error to the console
                }
            });
        });

url是一个隐藏的html值，它映射到我试图将数据POST到的url：

<p hidden id="lookupLink">{% url "Users:lookup" %}</p>

为了安全起见，还有一个额外的js部分可以向Django提交CSRF令牌：

// CSRF VALIDATION //
// This function gets cookie with a given name
function getCookie(name) {
    var cookieValue = null;
    if (document.cookie && document.cookie != '') {
        var cookies = document.cookie.split(';');
        for (var i = 0; i < cookies.length; i++) {
            var cookie = jQuery.trim(cookies[i]);
            // Does this cookie string begin with the name we want?
            if (cookie.substring(0, name.length + 1) == (name + '=')) {
                cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                break;
            }
        }
    }
    return cookieValue;
}
var csrftoken = getCookie('csrftoken');
/*
The functions below will create a header with csrftoken
*/
function csrfSafeMethod(method) {
    // these HTTP methods do not require CSRF protection
    return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method));
}
function sameOrigin(url) {
    // test that a given url is a same-origin URL
    // url could be relative or scheme relative or absolute
    var host = document.location.host; // host + port
    var protocol = document.location.protocol;
    var sr_origin = '//' + host;
    var origin = protocol + sr_origin;
    // Allow absolute or scheme relative URLs to same origin
    return (url == origin || url.slice(0, origin.length + 1) == origin + '/') ||
        (url == sr_origin || url.slice(0, sr_origin.length + 1) == sr_origin + '/') ||
        // or any other URL that isn't scheme relative or absolute i.e relative.
        !(/^('/'/|http:|https:).*/.test(url));
}
$.ajaxSetup({
    beforeSend: function(xhr, settings) {
        if (!csrfSafeMethod(settings.type) && sameOrigin(settings.url)) {
            // Send the token to same-origin, relative URLs only.
            // Send the token only if the method warrants CSRF protection
            // Using the CSRFToken value acquired earlier
            xhr.setRequestHeader("X-CSRFToken", csrftoken);
        }
    }
});
return false;
});

当我尝试使用这个ajax函数时，它不会发布到我请求的url，而是发布到用户所在的页面。我做错了什么？