ajax.xhr.progress.js

// v1
$.ajax({
  url: path,
  xhrFields: {
    onprogress: function (e) {
      if (e.lengthComputable) {
        // Progress..
        console.log(e.loaded / e.total * 100 + '%');
      }
    }
  },
  success: function (response) {
    // Complete!
  }
});

// v2
$.ajax({
  url: path
}).progress(function (e) {
  if (e.lengthComputable) {
    // Progress..
    console.log(e.loaded / e.total * 100 + '%');
  }
}).success: function (response) {
    // Complete!
  }
});