var dropzone = new Dropzone(".upload-zone", {
        url: 'http://.....',
        .....
        uploadprogress: function(file, progress, bytesSent) {
          var $progressElement = $("[data-dz-uploadprogress]");
          $progressElement.text(parseInt(progress) + '%');
          $progressElement.css('width', progress + '%');
        }
      });