onlyurei/knockout-spa

/*! knockout-spa (https://github.com/onlyurei/knockout-spa) * Copyright 2015-2017 Cheng Fan * MIT Licensed (https://raw.githubusercontent.com/onlyurei/knockout-spa/master/LICENSE) */
define(['jquery', 'sugar'], function () {

  var initialized = false;

  function initListenOnBody() {
    // Google Analytics click tracking event delegation for elements that have 'data-ga' attribute,
    // the attribute value should be in the following format:
    // <Category>[|Action[|Label[|Value[|Implicit Count]]]]
    // See detailed guide at:
    // https://developers.google.com/analytics/devguides/collection/gajs/eventTrackerGuide
    $('body').on('click', '*[data-ga], a, button', function (event) {
      if (window.ga) {
        var target = event.currentTarget;
        var gaDataArray = [];
        var gaData = $(target).data('ga');
        if (gaData) {
          gaDataArray = gaData.split('|').union({ page: window.location.pathname });
        } else {
          gaDataArray = [
            'click', ($(target).text() || '').compact(),
            ($(target).attr('id') || $(target).attr('name') || $(target).attr('class') || '').compact()
          ];
        }
        if (gaDataArray.length) {
          window.ga.apply(null, ['send', 'event'].union(gaDataArray));
        }
      }
    });
  }

  var GA = {
    init: function (account, plugins, listenOnBody) {
      if (!initialized) {
        (function (i, s, o, g, r, a, m) {
          i.GoogleAnalyticsObject = r;
          i[r] = i[r] || function () {
              (i[r].q = i[r].q || []).push(arguments);
            }, i[r].l = 1 * new Date();
          a = s.createElement(o), m = s.getElementsByTagName(o)[0];
          a.async = 1;
          a.src = g;
          m.parentNode.insertBefore(a, m);
        })(window, document, 'script', '//www.google-analytics.com/analytics.js', 'ga');
        window.ga('create', account, 'auto');
        if (Object.isArray(plugins)) {
          plugins.each(function (params) {
            window.ga.apply(window, params);
          });
        }
        if (listenOnBody) {
          initListenOnBody();
        }
        initialized = true;
      }
    },
    trackPageView: function (path, callback) {
      if (window.ga) {
        var pageViewParams = {
          page: path || window.location.pathname
        };
        if (callback && Object.isFunction(callback)) {
          pageViewParams.hitCallback = callback;
        }
        window.ga('send', 'pageview', pageViewParams);
      }
    },
    trackEvent: function (event, callback) {
      var calledBack = false;

      function _callback() {
        if (!calledBack) {
          calledBack = true;
          callback();
        }
      }

      if (Object.isFunction(callback)) {
        _callback.delay(500);
      }
      if (window.ga) {
        var eventParams = Object.findAll({
          eventCategory: event.category,
          eventAction: event.action,
          eventLabel: event.label,
          eventValue: event.value,
          page: window.location.pathname
        }, function (key, value) {
          return !!value;
        });
        if (Object.isFunction(callback)) {
          eventParams.hitCallback = _callback;
        }
        window.ga('send', 'event', eventParams);
      }
    }
  };

  return GA;

});