From 54b30d735523c31237ab94959c983b0eeb5c4ebe Mon Sep 17 00:00:00 2001
From: Jeffrey Tse <jeffreytse.mail@gmail.com>
Date: Sat, 24 Jun 2023 11:01:02 +0800
Subject: feat: google analytics 4 (GA4) support (#112)

---
 _config.yml                                |  5 +++--
 _includes/extensions/google-analytics.html | 20 ++++++++++++++------
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/_config.yml b/_config.yml
index 989eabb..59b1c2b 100644
--- a/_config.yml
+++ b/_config.yml
@@ -65,8 +65,9 @@ yat:
 # If you want to change the content width, you can set to another value
 # content_width: "920px"
 
-# Google analytics
-# google_analytics: [Tracking ID]
+# Google analytics - GA4
+# google_analytics: [Measurement ID]
+# enableDNT: "false"
 
 # If you want to generate website sitemap, you can set true
 # sitemap: false
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);
-- 
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