How to access dataLayer variables

Question

On our website we have a data layer to define some variables to be passed on to Google Analytics. It is defined like this:

deviceCategory: "DESKTOP"
deviceMode: "DESKTOP"
domainName: ".mydomain.com"
environment: "production"
operatingSystem: "UNKNOWN"
page.category.pageType: "Content"
page.category.primaryCategory: "main"
page.pageInfo.language: "en"
page.pageInfo.pageID: "productSelection"
user.profile.address.city: "Los Angeles"
user.profile.address.country: "US"

When I type the following in console it outputs exactly as expected: dataLayer[0].deviceMode --> "DESKTOP"

However, when I try to access any of the page/user variables I get errors: dataLayer[0].page.category.pageType --> Uncaught TypeError: Cannot read property 'category' of undefined

Any idea why this is happening? What is the proper way to access these values?

nyuen · Accepted Answer · 2016-04-05 17:46:27Z

2

The keys you are using are just strings with dots in them. They are not parts of an object, so you would need to access like this:

dataLayer[0]['page.pageInfo.language']

using the square brackets.

Edit: Note that this is not what you would do in GTM though (but perhaps no need to comment more since you're not asking about that).

edited Apr 5, 2016 at 17:46

answered Apr 5, 2016 at 17:43

nyuen

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