add analytics

martriay · martriay · commit 52ac4709f34a · 2025-10-22T05:22:55.000Z
diff --git a/.env.local.example b/.env.local.example
@@ -0,0 +1,4 @@
+# Google Analytics
+# Get your measurement ID from https://analytics.google.com/
+# It should look like: G-XXXXXXXXXX
+NEXT_PUBLIC_GA_MEASUREMENT_ID=G-XXXXXXXXXX
diff --git a/pages/_document.js b/pages/_document.js
@@ -0,0 +1,38 @@
+import { Html, Head, Main, NextScript } from 'next/document';
+
+export default function Document() {
+  const GA_MEASUREMENT_ID = process.env.NEXT_PUBLIC_GA_MEASUREMENT_ID;
+
+  return (
+    <Html>
+      <Head>
+        {/* Google Analytics */}
+        {GA_MEASUREMENT_ID && (
+          <>
+            <script
+              async
+              src={`https://www.googletagmanager.com/gtag/js?id=${GA_MEASUREMENT_ID}`}
+            />
+            <script
+              dangerouslySetInnerHTML={{
+                __html: `
+                  window.dataLayer = window.dataLayer || [];
+                  function gtag(){dataLayer.push(arguments);}
+                  gtag('js', new Date());
+                  gtag('config', '${GA_MEASUREMENT_ID}', {
+                    page_path: window.location.pathname,
+                  });
+                `,
+              }}
+            />
+          </>
+        )}
+      </Head>
+      <body>
+        <Main />
+        <NextScript />
+      </body>
+    </Html>
+  );
+}
+
