analytics-behavior.html

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<script>

  var GoogleCodelabs = window.GoogleCodelabs || {};

  /**
   * `GoogleCodelabs.AnalyticsBehavior` implements Google Analytics functionality.
   *
   * @polymerBehavior GoogleCodelabs.AnalyticsBehavior
   */
  GoogleCodelabs.AnalyticsBehavior = {
    listeners: {
      'google-codelab-step': '_trackStepChanged',
      'google-codelab-complete': '_trackCodelabComplete',
      'google-codelab-snippet-copy': '_trackSnippetCopy',
      'google-codelab-survey-answer': '_trackSurveyAnswer'
    },

    get _isTrackingEnabled() { return !!window.ga; },

    _gaSend: function(hit, target, params) {
      params.hitType = hit;
      params.dimension1 = target.environment;
      params.dimension2 = target.category;
      window['ga'](function() {
        var trackers = ga.getAll();
        for (var i = 0; i < trackers.length; i++) {
          var tracker = trackers[i];
          tracker.send(params);
        }
      });
    },

    _trackStepChanged: function(e, detail) {
      if (!this._isTrackingEnabled) {
        return;
      }
      this._gaSend('pageview', e.target, {
        page: location.pathname + '#' + detail.index,
        title: detail.step.label
      });
    },

    _trackCodelabComplete: function(e) {
      if (!this._isTrackingEnabled) {
        return;
      }
      this._gaSend('event', e.target, {
        eventCategory: 'codelab',
        eventAction: 'complete',
        eventLabel: e.target.title
      });
    },

    _trackSnippetCopy: function(e, detail) {
      if (!this._isTrackingEnabled) {
        return;
      }
      this._gaSend('event', e.target, {
        eventCategory: 'snippet',
        eventAction: 'copy',
        eventLabel: detail.snippet.substring(0, 500)
      });
    },

    _trackSurveyAnswer: function(e, detail) {
      if (!this._isTrackingEnabled) {
        return;
      }
      this._gaSend('event', e.target, {
        eventCategory: 'survey',
        eventAction: detail.question.substring(0, 500),
        eventLabel: detail.answer.substring(0, 500)
      });
    }
  };
</script>