Google Tag Manager on Sitefinity | OpsBlu Docs

Google Tag Manager on Sitefinity

How to install and configure Google Tag Manager on Sitefinity. Covers installation method, container setup, verification, and Sitefinity-specific...

For general GTM concepts, see Google Tag Manager Overview

Overview

Sitefinity is a .NET CMS by Progress Software. Add GTM via the JavaScript & CSS widget or by editing your layout template.

Prerequisites

Installation

Where to Add GTM Code

Easiest: Drag a JavaScript & CSS widget onto your page template in the PageEditor. Add the head snippet. For site-wide injection, edit your master layout file (~/Mvc/Views/Layouts/default.cshtml) or use Sitefinity's Administration → Settings → Advanced → Appearance → Frontend JavaScript fields.

GTM Head Snippet

Add this in the <head> section:

<!-- Google Tag Manager -->
<script>(function(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);
})(window,document,'script','dataLayer','GTM-XXXXXXX');</script>
<!-- End Google Tag Manager -->

GTM Body Snippet

Add this immediately after the opening <body> tag:

<!-- Google Tag Manager (noscript) -->
<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-XXXXXXX"
height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<!-- End Google Tag Manager (noscript) -->

Replace GTM-XXXXXXX with your actual Container ID in both snippets.

Sitefinity-Specific Considerations

Sitefinity's output cache can serve stale pages. After adding GTM, flush the output cache: Administration → Settings → Advanced → System → Output Cache Settings → Pages → Clear.

Template System

Sitefinity uses Razor views (.cshtml) and Sitefinity widgets. When editing templates directly, note that the GTM JavaScript snippet (inside <script> tags) will not conflict with the template engine's syntax.

Verification

After installation, verify GTM is working:

  1. GTM Preview Mode — In GTM, click Preview, enter your site URL, and verify the container loads.
  2. Browser Console — Open DevTools (F12) and run console.log(window.google_tag_manager). You should see an object (not undefined).
  3. Network Tab — Filter for googletagmanager.com and verify gtm.js loads with a 200 response.
  4. Data Layer Check — Run console.log(window.dataLayer) to verify the data layer array exists.

Next Steps

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