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(function(){
  var $ = jQuery;

  var TRANSFORM_TYPES = ['PUT', 'POST', 'DELETE'];

  $.activeTransforms = 0;

  $(document).ajaxSend(function(e, xhr, settings) {
    if (TRANSFORM_TYPES.indexOf.call(settings.type) < 0) return;
    return $.activeTransforms += 1;
  });

  $(document).ajaxComplete(function(e, xhr, settings) {
    if (TRANSFORM_TYPES.indexOf.call(settings.type) < 0) return;
    return $.activeTransforms -= 1;
  });

  window.onbeforeunload || (window.onbeforeunload = function() {
    if ($.activeTransforms) {
      return 'There are some pending network requests which\nmeans closing the page may lose unsaved data.';
    }
  });
}).call(this);