ajax url不会调用php文件

Question

I am trying to update the user input ratings through ajax call. This one alert(performance_rating) returned the user input ratings properly. But, I have a problem with my url. it won't call user_ratings.php. I don't know why? I have tried alert function in user_ratings.php page. But, it won't alert.

I have the user_ratings.php file in siteurl.com/include/pages/user_ratings.php How do I call my php file properly?

ajax request

$(function () {
    $('#form').on('submit', function (e) {
      performance_rating = $('input:radio[name=rating]:checked').val();
      e.preventDefault();
      $.ajax({
        type: 'POST',
        url: 'user_ratings.php',
        data: {
            rating: performance_rating
        },
        success: function() {
            alert(performance_rating);
        }
      });
    });
});

Answer 1

first its better you do this

define("URL", "http://siteurl.com/");

Then in the ajax url section write

url: '<?php echo URL ;?>includes/pages/user_ratings.php',