Looking for help with a JavaScript variable code in GTM that acts like a data layer variable. My current code isn't functioning in GSM, can you spot the issue?
function() {
var result = null
if (dataLayer[dataLayer.length - 1] == undefined) {
result = 'undefined'
} else {
result = dataLayer[dataLayer.length - 1]['eventCategory']
}
return result
}
Objective: Ensure data layer variable and custom JavaScript variable work interchangeably in GTM
If you're looking to retrieve the most recent value for a specific key in the datalayer, there are two methods you can try:
1.
var latestValue = null;
for (var i = window.dataLayer.length - 1; i >= 0; i--) {
if (window.dataLayer[i]['your_key'] !== undefined) {
latestValue = window.dataLayer[i]['your_key'];
break;
}
}
console.log(latestValue);
var variableValue = google_tag_manager["GTM-XXXXXX"].dataLayer.get('your_key');
console.log(variableValue);
Remember to replace your_key with the key you want to access when trying out these methods.
For the second method, make sure to substitute GTM-XXXXXX with your actual GTM Container ID.
Although both approaches should provide similar results as accessing via DataLayer variable, feel free to share any issues or reasons why accessing values through JavaScript is necessary.
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