Ajax成功对我不起作用

Question

follow code is supposed to show alert msg. It is doing nothing. Can anyone tell me where I am wrong. Everything is working nicely execpt alert().

<script>
      $(document).ready(function(){
    var baseUrl = document.location.origin;

 $(".ProductRemove").click(function(){
   var row_id = $(this).attr('id');
 $.ajax({
    type:"POST",
    cache:false,
    url:baseUrl+"/shop/api/cart",
    data:"row_id="+row_id+"&action=remove",    // multiple data sent using ajax
    success: function () {

          alert('success');

    },
    error: function(){
   alert('failure');
 }
  });
  });
});

Answer 1

Thanks to all, I got the solution. It is calling error function instead of success because I am returning in nothing from the server.

In ajax empty is not considered as JSON data. So to fix that I have to echo "json_encode(NULL);" in my server.