feat: google analytics 4 (GA4) support (#112)

1 files changed, 14 insertions, 6 deletions

diff --git a/_includes/extensions/google-analytics.html b/_includes/extensions/google-analytics.html
index a3b6d85..9ae8963 100644
--- a/_includes/extensions/google-analytics.html
+++ b/_includes/extensions/google-analytics.html
@@ -1,3 +1,4 @@
+<!-- Google tag (gtag.js) -->
 <script>
   function initGoogleAnalytics() {
     var doNotTrack = (window.doNotTrack === "1" || navigator.doNotTrack === "1" ||
@@ -5,13 +6,20 @@
     var enableDNT = "{{ site.enableDNT | default: true }}" == "true";
 
     if (!enableDNT || !doNotTrack) {
-      (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','https://www.google-analytics.com/analytics.js','ga');
+      var measurementId = '{{ site.google_analytics }}';
 
-      ga('create', '{{ site.google_analytics }}', 'auto');
-      ga('send', 'pageview');
+      (function(src) {
+        var tag = document.createElement('script');
+        tag.src = src;
+        tag.async = true;
+        var firstScriptTag = document.getElementsByTagName('script')[0];
+        firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
+      })('https://www.googletagmanager.com/gtag/js?id=' + measurementId);
+
+      window.dataLayer = window.dataLayer || [];
+      function gtag(){dataLayer.push(arguments);}
+      gtag('js', new Date());
+      gtag('config', measurementId);
     }
   }
   window.addEventListener("load", initGoogleAnalytics);