Drop-Down Navigation: Responsive and Touch-Friendly

doubletaptogo.js

/*
 * By Osvaldas Valutis, www.osvaldas.info
 * Available for use under the MIT License
 *
 * With minor syntax improvements to approve JsLint. (Ramiro Silveyra d'Avila - https://ramasilveyra.com.ar/)
*/
(function ($, window, document) {
  'use strict';
  $.fn.doubleTapToGo = function () {
    if (typeof (window.ontouchstart) === 'undefined' && !navigator.msMaxTouchPoints && !navigator.userAgent.toLowerCase().match(/windows phone os 7/i)) {
      return false;
    }

    this.each(function () {
      var curItem = false;

      $(this).on('click', function (e) {
        var item = $(this);
        if (item[0] !== curItem[0]) {
          e.preventDefault();
          curItem = item;
        }
      });

      $(document).on('click touchstart MSPointerDown', function (e) {
        var resetItem = true,
          parents   = $(e.target).parents(),
          i;

        for (i = 0; i < parents.length; i + 1) {
          if (parents[i] === curItem[0]) {
            resetItem = false;
          }
        }

        if (resetItem) {
          curItem = false;
        }
      });
    });
    return this;
  };
}(jQuery, window, document));

This is my version of doubletaptogo.js by Osvaldas Valutis (http://osvaldas.info/drop-down-navigation-responsive-and-touch-friendly) with only minor syntax improvements to approve JSLint.