Jquery and Django CSRF Token

You are not passing the csrf token with POST. Try doing what I have done in data. That is to fetch the csrf token (or your own method) and pass it in your arguments.

$.ajax({
    url : url,
    type: "POST",
    data : {csrfmiddlewaretoken: document.getElementsByName('csrfmiddlewaretoken')[0].value},
    dataType : "json",
    success: function( data ){
        // do something
    }
});