added piwik tracking for: ajax loading timing, site search

sites/all/themes/custom/edlptheme/assets/scripts/main.js

@@ -11,6 +11,10 @@
     var _audioPlayer;
     var _randomPlayer;
     var _compoPlayer;
+    var _ajax_timing = {
+      start:0,
+      end:0
+    };
 
     //  ___      _ _
     // |_ _|_ _ (_) |_
@@ -163,7 +167,7 @@
     function ajaxLoadContent(state){
       console.log('ajaxLoadContent : state', state);
       _$body.addClass('ajax-loading');
-
+      _ajax_timing.start = performance.now();
       var path = window.location.origin + Drupal.url(state.ajax_path);
       $.getJSON(path, {})
         .done(function(data){
@@ -318,7 +322,12 @@
           // https://matomo.org/blog/2017/02/how-to-track-single-page-websites-using-piwik-analytics/
           _paq.push(['setCustomUrl', state.url]);
           _paq.push(['setDocumentTitle', data.title]);
+          // TODO: piwik track load time
+          _ajax_timing.end = performance.now();
+          _paq.push(['setGenerationTimeMs', _ajax_timing.end-_ajax_timing.start]);
           _paq.push(['trackPageView']);
+
+
           // js event
           // trackEvent(category, action, [name], [value])
           _paq.push(['trackEvent', 'AjaxNav', 'loaded', state.url]);