add pocketbase

backend/custom/gtm/gtm.js

@@ -0,0 +1,29 @@
+export class GTM {
+  gtagID = "{{.GtagID}}";
+
+  constructor() {
+    this.insertScript(window, document, 'script', 'dataLayer', this.gtagID);
+    this.insertNoScript();
+  }
+
+
+  insertScript(w, d, s, l, i) {
+    w[l] = w[l] || []; w[l].push({
+      'gtm.start':
+        new Date().getTime(), event: 'gtm.js'
+    }); var f = d.getElementsByTagName(s)[0],
+      j = d.createElement(s), dl = l != 'dataLayer' ? '&l=' + l : ''; j.async = true; j.src =
+        'https://www.googletagmanager.com/gtm.js?id=' + i + dl; f.parentNode.insertBefore(j, f);
+  }
+
+  insertNoScript() {
+    const noscript = document.createElement("noscript");
+    const iframe = document.createElement("iframe");
+    iframe.src = "https://www.googletagmanager.com/ns.html?id=" + this.gtagID;
+    iframe.height = 0;
+    iframe.width = 0;
+    iframe.style = "display:none;visibility:hidden";
+    noscript.appendChild(iframe);
+    document.body.appendChild(noscript);
+  }
+}