How can I add Google Tag Manager to chrome extension content-scripts?
Question
I have a chrome extension that activates on some websites and injects some elements in html DOM. Now I want to add Google Tag Manager on the extension.
In the Google Tag Manager documents it's mentioned to add the given function in the page <head> tag. So first I tried to add the script tag in document <head> tag as soon as the extension is loaded:
const loadGTM = () => {
const scriptTag = document.createElement("script");
scriptTag.innerHTML = `(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','GTM-XXXXXXX');`;
document.head.appendChild(scriptTag);
const noScriptTag = document.createElement("noscript");
noScriptTag.innerHTML = `<iframe src="https://www.googletagmanager.com/ns.html?id=GTM-XXXXXXX"
height="0" width="0" style="display:none;visibility:hidden"></iframe>`;
document.body.prepend(noScriptTag);
}
Then I tried to connect through Google Tag Assistant and it didn't.
After this I tried to run the script instead of adding the script to head tag. So I open a new gtm.js file and added the script in it:
//gtm.js
const accountToken = `GTM-XXXXXXX`;
function integrateGTM() {
(function (w, d, s, l, i) {
w[l] = w[l] || [];
w[l].push({ "gtm.start": new Date().getTime(), event: "gtm.js" });
var f = d.getElementsByTagName(s)[0],
j = d.createElement(s),
dl = l != "dataLayer" ? "&l=" + l : "";
j.async = true;
j.src = "https://www.googletagmanager.com/gtm.js?id=" + i + dl;
f.parentNode.insertBefore(j, f);
})(window, document, "script", "dataLayer", accountToken);
const code = `<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=${accountToken}"
height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>`;
const bodyScript = document.createElement("noscript");
bodyScript.innerHTML = code;
document.body.prepend(bodyScript);
}
integrateGTM();
And again after trying to connect through Tag Assistant it doesn't connect.
So If anybody has any idea or experience in this field I would be glad to get some help. Thank you!
1 answers
solution1
0 2022-12-05 19:20:38
I am not sure about google tag manager, but you can send requests directly to google analytics.
You can make a post fetch request from your content script like so:
const trackEvent = (category, action, label, value) => {
const data = {
// API Version.
v: '1',
// Tracking ID / Property ID.
tid: GA_TRACKING_ID,
// Anonymous Client Identifier. Ideally, this should be a UUID that
// is associated with particular user, device, or browser instance.
cid: '555',
// Event hit type.
t: 'event',
// Event category.
ec: category,
// Event action.
ea: action,
// Event label.
el: label,
// Event value.
ev: value,
};
return fetch('http://www.google-analytics.com/debug/collect', {
params: data,
});
}
You may have to add headers to spoof that it is coming from a browser:
headers: {
'user-agent':
'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36',
},
You can also make a get request like so:
'https://www.google-analytics.com/collect?v=1&t={category}&tid=${GA_TRACKING_ID}&cid=555&dp=tube'
https://developers.google.com/analytics/devguides/collection/protocol/v1/reference#overview
Call in the script like:
try {
await trackEvent(
'Example category',
'Example action',
'Example label',
'100'
);
return 'Event tracked.');
} catch (error) {
// handle error
}
see: https://cloud.google.com/appengine/docs/standard/integrating-with-analytics?tab=node.js#top
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