How do I trigger a form based on a JavaScript variable?

In this article, we explained how you can add conditions to your deployment. In the following article, we will elaborate a bit more on the JS Variable condition.

The JS variable should be globally accessible, so for instance, if user_id is a global variable it will take the value it contains and passes it along as feedback (as a string). The variable can also be an object or array or even a nested object (for instance: test_object.user_id) if the value of the specified variable is an array or object it will be encoded into a JSON string. Basically, as long as the variable's scope is global we'll be able to pick it up.


Trigger on a simple JS variable

The form appears if the variable example = "triggered":

Trigger on nested objects

If your object looks like: variable example = {'userGroup': 'admin'}, then you can use example.userGroup matches admin to make the form appear:

Trigger data layer content

To trigger a data layer, a wildcard [*] should be used. In this example, the form appears if the data layer ‘products’ contains the value ‘shoes’.

dataLayer[*].["products"] contains shoes



The values you set in in the conditions are stored as a String. This has some implications if you want to check for a Boolean value in the variable on your page.

JS Variable if the condition is true

Let’s say your specified variable, var1 is true. Adding the condition var1=true will not work, as “true” != true. If var1 is true (boolean), you could use the condition var1=1.

JS Variable if the condition is false

Let’s say your specified variable, var1 is false. Adding the condition var1=false will not work, as “false” != false. If var1 is false (boolean), you could use the condition var1=0.