Video Title - returns a string with the title of the embedded video. In the middle of October 2018, Google Tag Manager silently introduced a new feature that caused some questions in the GTM community (including me), an Undefined variable. Because variables can be resolved in multiple ways, and not just in tags as you’d expect, you might find yourself creating infinite loops, pushing stuff into dataLayer multiple times, or severely hurting page performance. If the variable is referenced in a trigger that is not attached to any tags, the variable is never resolved. The value stored in the global JavaScript variable that you specify. Thus, the idea is very similar to the broader concept of computing variables explored in the previous paragraph. Thus, whenever the variable name is invoked using the correct syntax, the tracking code returned by the Constant variable will be included in the appropriate tag field. As you can see, the Built-in variables are just a quicker way to access some of the most common variable types. To access Array members, use dot notation instead of square notation. This is a very versatile variable type, and is especially useful for traversing query parameters and hash fragments in your URLs. The above script works if your desired text lies in the closest parent ID. Discard post? The Custom Event variable returns the value of the ‘event’ key in the Data Layer. true when the user is in Container Debug mode, and false when not. This little neat GTM upgrade can be helpful when you need a variable with an actual undefined value. The Google Analytics Settings variable returns a set of Universal Analytics tag settings. You shouldn’t use a Custom JavaScript variable to modify the global namescape by pushing values to dataLayer for example. Would love your thoughts, please comment. For example, if you have a cookie called “session”, you can use the 1st Party Cookie variable to retrieve the value for this particular cookie. But as I have mentioned several paragraphs ago, I could not come up with a solid example for this case, therefore, I’m playing soft here. Description is just what it sounds like - a brief (200 characters or less) description of what this variable does. However, it’s not an innovation that was impossible before. Built-in variables are thus no more than a shorthand for exploiting some of the most frequently used variable types in Google Tag Manager. So you can treat the new Undefined Variable as a more elegant solution for non-developers who are allergic (?) Here’s an example of using the JavaScript variable with a custom tag. In GTM, invoking the variable function is done with a specific syntax: As we’ll learn later on, you can’t invoke variables wherever you’d want to. Stored in the Data Layer under the key gtm.elementTarget. It’s how you use them together to create sense out of the complexity that almost any tag implementation brings in its wake. If you see this value in a state where you are certain the variable should have a proper value, it means there’s something wrong with your variables, tags, or triggers, and you need to look into it more carefully. It’s also possible that you’ve jumped the gun and called a variable, but then you forgot to create the variable itself. For plain objects and Arrays, the variable will return the result of a recursive merge, where only shared keys are replaced. Stored in Data Layer under the key gtm.historyChangeSource. You can choose to Strip ‘www.' This is pretty self-explanatory. I just wanted to show you how a string and undefined values look in the Preview and Debug mode. The Input variable specifies the variable which will be used as the input in the lookups. Video Duration - returns a number with the total length of the video in seconds. ALT Text. Video Status - returns a string with the status of the video that caused the trigger to fire. The return value for the URL type you specified in the Component Type selection, or undefined if no such component is found in the URL variable. You can’t invoke the variable in other contexts. It won’t return anything for Live or Latest versions. Retrace your steps and fix any broken links. © Copyright PHPInfo 2018 | All Rights Reserved. Are you sure you want to continue? You will lose what you have written so far. Just remember to pay heed to the technical details as well. In fact, the condition builder is created so that you can’t possibly not choose a variable. Disclaimer: I could not come up with a solid example here so don’t be too hard about it. This is also a Built-In variable, so use that instead of creating a new User-Defined variable. For inspiration, read this article. Not the string (text) “undefined” but the actual undefined value (read no value at all). Since this is a Lookup Table, the value lookup is always exact match and case-sensitive. Element ID - Returns the value of the id attribute of the auto-event element. In fact, it has no settings at all (if we ignore the standard “Format Value” feature). If you don’t give a default value, the Data Layer variable will return undefined in case no variable with the given name is found.

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