4842d6b65f5d24617ee05ed73cfba4760ae56d9a
max
  Tue Sep 22 03:35:14 2020 -0700
handle ad-blockers in outbound link tracking, refs #21916,

diff --git src/hg/lib/googleAnalytics.c src/hg/lib/googleAnalytics.c
index 1494650..6bf230d 100644
--- src/hg/lib/googleAnalytics.c
+++ src/hg/lib/googleAnalytics.c
@@ -20,48 +20,51 @@
 char *analyticsKey = cfgOption("analyticsKey");
 
 /*	if config is missing or empty, nothing happens here	*/
 if (isEmpty(analyticsKey))
     return;
 
 /* updated to Universal Analytics code 2014-06-19 */
 
 jsInlineF(
 "  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){\n"
 "  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),\n"
 "  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)\n"
 "  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');\n"
 "  ga('create', '%s', 'auto');\n"
 "  ga('require', 'displayfeatures');\n"
+"  ga('set', 'transport', 'beacon');\n"
 "  ga('send', 'pageview');\n"
 "\n"
 , analyticsKey);
 // see https://support.google.com/analytics/answer/1136920?hl=en
 jsInlineF(
 "  function anchorClicked(ev) {\n"
 "  /* user clicked an anchor: send event to Google analytics and navigate to the link */\n"
 "      var isExternal = (ev.target.target==='_blank');\n"
 "      var url = ev.target.href;\n"
 "      if (url === undefined)\n" // this happens on hgTracks, for the case <a href....><p>bla</p></a>
 "           url = ev.target.closest('a');\n"
 "      if (isExternal) {\n"
 "         ga('send', 'event', 'outbound', 'click', url,\n"
 "           { 'transport': 'beacon', 'hitCallback': function(){window.open(url);} });\n"
 "      } else {\n"
 "         document.location=url;\n"
 "      }\n"
 "      return false;\n"
 "  }"
 "  $(document).ready(function() {\n"
+"      if (!window.ga || ga.loaded)\n"
+"          return;\n"
 "      var anchors = document.getElementsByTagName('a');\n"
 "      for (var i = 0; i < anchors.length; i++) { \n"
 "           var a = anchors[i];\n"
 "           if (a.attributes.href && a.attributes.href.value!=='#')\n" // do not run on javascript links
 "               a.onclick = anchorClicked;"
 "      };\n"
 "      // on hgTracks: send an event with the current db, so we can report popularity of assemblies to NIH\n"
 "      if (typeof hgTracks !== undefined)\n"
 "          ga('send', 'event', 'hgTracks', 'load', getDb());\n"
 "  });"
 );
 
 }