Added support for Google gtag.js via html.gtag

jbogdani · Sep 28, 2021 · 1c6628a · 1c6628a
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diff --git a/docs/tmpl_html.md b/docs/tmpl_html.md
@@ -675,6 +675,22 @@ E.g.: `{{ html.getVersion }}`
 ```
 ---
 
+#### gtag()
+Returns javascript code for Google Global Tag (gtag.js). Google Analytics id must be provided in the site configuration file. A domain is provided in the configuration file; the code will be shown only if current domain matches the provided domain. This is very useful in test installations.
+
+E.g.: `{{ html.gtag }}`
+
+```javascript
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=GA-ID"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+  gtag('config', 'GA-ID');
+</script>
+```
+---
 #### GUA()
 Returns javascript code for Google Universal Analytics Tracking. Google Analytics id must be provided in the site configuration file. A domain is provided in the configuration file; the code will be shown only if current domain matches the provided domain. This is very useful in test installations.
 

diff --git a/lib/OutHtml.php b/lib/OutHtml.php
@@ -616,6 +616,32 @@ public function GUA()
         return $html;
     }
 
+    /**
+     * Returns html containing Google Global Tag (gtag.js)
+     * @return string
+     */
+    public function gtag()
+    {
+        $id = cfg::get('ga_id');
+
+        $restrict_domain = cfg::get('ga_domain');
+
+
+        if ($id && (!$restrict_domain || (preg_match('/' . $restrict_domain . '/', $_SERVER['HTTP_HOST']))) && !$this->cfg['isDraft']) {
+            $html = '<!-- Global site tag (gtag.js) - Google Analytics -->' .
+            '<script async src="https://www.googletagmanager.com/gtag/js?id=' . $id . '"></script>' .
+            '<script>' .
+              'window.dataLayer = window.dataLayer || [];' .
+              'function gtag(){dataLayer.push(arguments);}' .
+              "gtag('js', new Date());" .
+
+              "gtag('config', '" . $id . "');".
+            '</script>';
+        }
+
+        return $html;
+    }
+
 
     /**
      * Returns html with image gallery. Alias for customTags:gallery()

diff --git a/version b/version
@@ -1,3 +1,4 @@
+5.8.0[] = "Added support for Google gtag.js via html.gtag"
 5.7.1[] = "Removed debugging error_log in template_ctrl"
 5.7.0[] = "Changed format of logAttempts, and rised time buffer to 2 seconds"
 5.6.2[] = "Optimized calculation of path of assets"