Getting Advanced With Google Tag Manager (Part 2 of 3)

  |  March 14, 2013   |  Comments   |  

Bringing dynamic data to your tags with the data layer and macros

In my last article Take Control of Tagging with Google Tag Manager, I covered the advantages of Google Tag Manager and how to get started with it. Today we'll look at passing dynamic values into your contained tags using the data layer and macros.

The data layer

In technical speak, the data layer is a JavaScript object that sits on your page and contains information about the page, its content, and/or your visitor. Google Tag Manager reads the information from the data layer and passes it on to the relevant tags within your tag container. The data layer can be set at the time of page load, or it can be added dynamically during a user's interaction with the page. If any of your tags require passing dynamic variables to it, then you'll most likely need the data layer.


When Google Tag Manager refers to "Macros," don't think of macros in Microsoft Excel or Microsoft Word. In programming speak, macros can be compared to variables. Macros are used to read values from a page. The macros can then be used to pass values on to your tags or be the basis for tag firing rules. Macros can be used to read information from the data layer, but it can also be used to grab values from HTML elements on your page.

An example

Data layers and macros can sound pretty abstract without seeing them in action. Let's look at a practical example that continues on from last week's example. Last week we set up a basic AdWords conversion tracking tag and a Facebook conversion pixel. What we didn't do is pass dynamic transaction values to the pixels so that it could also report on the actual value of the transaction. To pass this information into Google Tag Manager, we need to define a data layer variable that holds the value of the transaction, read the value via a macro, and then pass that value to the respective tags.

Here's how we do it:

1. Let's imagine the value of the transaction is $100. You would ask your web developer to include the below on your transaction completed page:


2. Now let's go into Google Tag Manager, navigate to our container, and click on "New Macro."

3. Give your macro a name. Under "Macro Type" select "Data Layer variable."

4. Under Data Layer Variable Name, enter "conversionValue." This has to match the label you used in your dataLayer. Leave "Do not set a default value" checked for this example. You could uncheck it and set a default value in instances where you would want there to be a default value if the variable was missing from the data layer.

5. Click "Save."

6. Now we need to pass the macro's value to our tags from last week. Expand the Tags menu and select the AdWords conversion tracking tag we created last month.

8. In the Conversion Value field, click on "+{{macro}}" and select "{{conversionValue}}."

Now whenever conversionValue is available in the data layer, the actual value (e.g., 100) will be inserted in the place of {{conversionValue}}.

9. Let's repeat the same process with the Facebook conversion pixel we created last time. In this custom HTML tag, replace

fb_param.value = ‘0';


fb_param.value = ‘{{conversionValue}}';

You'll notice that we used the same macro in multiple locations. Macros are reusable across your container's various tags and rules.

10. After this create a new container version (see last post), test it, and then publish it.

Those are the simple steps for passing dynamic values from your page to the tags within your Google Tag Manager containers. This is just scratching the surface. If you're curious, look into using macros to read values directly from the existing HTML on your page or your page's URL.

In my next column I will walk through best practices for managing your Google Tag Manager account.

Until then: happy tagging!

Subscribe to ClickZ Asia to receive your weekly dose of the region's latest trends, tips, and insights straight to your inbox.

ClickZ Live Toronto Twitter Canada MD Kirstine Stewart to Keynote Toronto
ClickZ Live Toronto (May 14-16) is a new event addressing the rapidly changing landscape that digital marketers face. The agenda focuses on customer engagement and attaining maximum ROI through online marketing efforts across paid, owned & earned media. Register now and save!


Vinoaj Vijeyakumaar

Vinny is managing partner and co-founder of Sparkline, a consultancy focused on optimizing conversion rates. Sparkline is a Google Analytics Certified Partner, Google Analytics Premium Authorized Reseller, Google Tag Manager Specialist, Adobe Marketing Cloud Solution Partner, and Optimizely Certified Partner. Vinny specializes in maximizing revenues for businesses by optimizing their digital presence across desktop and mobile websites, paid advertising, social media, and search engines. His core expertise lies in measurement, data analysis, testing, and insights that deliver results. Prior to founding Sparkline, Vinny was a senior conversion specialist at Google Southeast Asia for 5 years. You can get in touch with Vinny on Twitter @vinoaj, LinkedIn, Google+ or his company's website.

COMMENTSCommenting policy

comments powered by Disqus

Get the ClickZ Analytics newsletter delivered to you. Subscribe today!



Featured White Papers

ion Interactive Marketing Apps for Landing Pages White Paper

Marketing Apps for Landing Pages White Paper
Marketing apps can elevate a formulaic landing page into a highly interactive user experience. Learn how to turn your static content into exciting marketing apps.

eMarketer: Redefining Mobile-Only Users: Millions Selectively Avoid the Desktop

Redefining 'Mobile-Only' Users: Millions Selectively Avoid the Desktop
A new breed of selective mobile-only consumers has emerged. What are the demos of these users and how and where can marketers reach them?


    • Sr. Paid Search Manager
      Sr. Paid Search Manager (Bisk Education) - TampaCurrently seeking a Sr. Paid Search Manager in Tampa, FL for Bisk Education! Bisk Education is a...
    • Contact Center Professional
      Contact Center Professional (TCC: The Contact Center) - Hunt ValleyLooking to join a workforce that prides themselves on being routine and keeping...
    • Recruitment and Team Building Ambassador
      Recruitment and Team Building Ambassador (Agora Inc.) - BaltimoreAgora,, continues to expand! In order to meet the needs of our...