Snowplow Analytics Templates for Google Tag Manager

When custom templates were released for Google Tag Manager, I updated my workflow for working with GTM. Instead of instinctively rushing to the Custom HTML tag and the Custom JavaScript variable, I started considering whether the custom script that needed to be deployed could be transformed into a custom template first. While publishing numerous templates into the community gallery, I always spent some time over the past 12 months tinkering on an extremely complicated template translation: the Snowplow Analytics JavaScript tracker. Read More…

#GTMTips: Collect ISP as a Custom Dimension in Google Analytics

Update 6 April 2020: I updated the template in the gallery to the latest version of the IP Geolocation API SDK, which no longer requires jQuery. Also, the SDK now handles API request caching to browser storage automatically, so the “Enable Session Storage” option was added to the template. Google Analytics had been foreshadowing the deprecation of the Network Domain and Service Provider custom dimensions since late 2019. On February 4, the plug was finally pulled, and both these dimensions started flatlining to (not set) in Google Analytics reports. Read More…

CDNJS Hosted Libraries Template for Google Tag Manager

One of the prime things to use Google Tag Manager for is script injection. Loading a third-party JavaScript library is trivial to do with a Custom HTML tag, and works like a charm. However, using Custom HTML tags for, well, anything, is no longer the preferred way to add custom code to the site. Custom HTML tags are pretty expensive DOM injections, and they can be incredibly dangerous tools (for UX, security, and privacy) in the wrong and/or inexperienced hands. Read More…

Fetch IP Geolocation Data Using Google Tag Manager

Update 6 April 2020: I updated the template in the gallery to the latest version of the IP Geolocation API SDK, which no longer requires jQuery. Also, the SDK now handles API request caching to browser storage automatically, so the “Enable Session Storage” option was added to the template. My latest custom tag template tackles a use case I’ve referred to a number of times before, especially in my article on sending weather data to Google Analytics. Read More…

Persist Campaign Data on the Landing Page

Universal Analytics utilizes two components (by default) to attribute a browser session to a specific campaign: query parameters in the URL and the referrer string. The page URL is sent with every hit to Google Analytics using the Document location field, which also translates to the &dl parameter in the Measurement Protocol. The referrer string is sent with a hit to Google Analytics using the Document referrer field, as long as the referrer hostname does not exactly match that of the current page and the referrer string is not empty. Read More…

#GTMTips: Walkthrough of Custom Template Tests

Google Tag Manager now lets you add unit tests directly to your custom templates. This is useful, since it allows you to control the code stability of your templates, especially if you’ve decided to share those templates with the public. I recently shared a general guide for how template tests work, but I wanted to expand the topic a little, and share with you two walkthroughs of custom template tests: one for a variable template and one for a tag template. Read More…

Writing Tests for Custom Templates in Google Tag Manager

Google Tag Manager introduced the capability to add tests to your Custom Templates. Tests, in this context, refer specifically to unit tests that you write in order to make sure your template code works in a predictable way. Unit tests are also used to drive development, ensuring that you have added contingencies for all the different scenarios that the template, when coupled with user input, might introduce. In this guide, I’ll introduce how the Tests feature works. Read More…

Community Template Gallery for Google Tag Manager - Introduction and Tips for Use

Since the introduction of custom templates in May 2019, the community (myself included) has been anxiously waiting for some official solution for curating and distributing templates created by the community. Now, finally, we have it. It’s called the Community Template Gallery! Read Google’s announcement in this blog post. I’m not going to go over the basics in this article, since Google’s own documentation stands fine on its own feet. Read More…

User Distributor Custom Tag Template for Google Tag Manager

I’ve enjoyed working with custom templates for Google Tag Manager. A lot. So much so that whenever the need to add some custom code to a container emerges, my first thought is how to turn that into a custom template. Google has been forthcoming in introducing new APIs steadily, and I think the variety of things you can do with template is improving with every new API release. In this article, I’ll show you how to use a simple tag template for distributing your users to groups, based on a random split. Read More…

#GTMTips: Introducing the GTM Templates Library

When Custom Templates were released in Google Tag Manager, many of us active in the GTM communities started doing two things: 1) creating our own custom templates, and 2) waiting patiently for Google to release a “gallery” or “library” for distributing these community contributions. While I have full faith in the latter happening some time in the future, I thought it would be fun to create something similar to a library, and then open-sourcing it for the community to help out with or to download locally for their own purposes. Read More…