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fix: only attribute referrer to landing page and strip Meta ad params

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This commit is contained in:
Usman Baig
2026-03-13 01:31:14 +01:00
parent 1d71a13df4
commit 63144a136e
2 changed files with 30 additions and 17 deletions
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45
public/script.js
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@@ -226,7 +226,7 @@
}
// * Normalize path: strip trailing slash and UTM/marketing query parameters
var UTM_PARAMS = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'utm_id', 'fbclid', 'gclid', 'gad_source', 'msclkid', 'twclid', 'dclid', 'mc_cid', 'mc_eid', 'ref'];
var UTM_PARAMS = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'utm_id', 'fbclid', 'gclid', 'gad_source', 'msclkid', 'twclid', 'dclid', 'mc_cid', 'mc_eid', 'ref', 'ad_id', 'adset_id', 'campaign_id', 'ad_name', 'adset_name', 'campaign_name', 'placement', 'site_source_name'];
function cleanPath() {
var pathname = window.location.pathname;
// * Strip trailing slash (but keep root /)
@@ -250,6 +250,9 @@
return pathname;
}
// * SPA referrer: only attribute external referrer to the landing page
var firstPageviewSent = false;
// * Refresh dedup: skip pageview if the same path was tracked within 5 seconds
// * Prevents inflated pageview counts from F5/refresh while allowing genuine revisits
var REFRESH_DEDUP_WINDOW = 5000;
@@ -295,16 +298,20 @@
lcpObserved = false;
clsObserved = false;
currentEventId = null;
// * Strip self-referrals: don't send referrer if it matches the current site domain
var rawReferrer = document.referrer || '';
// * Only send external referrer on the first pageview (landing page).
// * SPA navigations keep document.referrer stale, so clear it after first hit
// * to avoid inflating traffic source attribution.
var referrer = '';
if (rawReferrer) {
try {
var refHost = new URL(rawReferrer).hostname.replace(/^www\./, '');
var siteHost = domain.replace(/^www\./, '');
if (refHost !== siteHost) referrer = rawReferrer;
} catch (e) {
referrer = rawReferrer;
if (!firstPageviewSent) {
var rawReferrer = document.referrer || '';
if (rawReferrer) {
try {
var refHost = new URL(rawReferrer).hostname.replace(/^www\./, '');
var siteHost = domain.replace(/^www\./, '');
if (refHost !== siteHost) referrer = rawReferrer;
} catch (e) {
referrer = rawReferrer;
}
}
}
const screenSize = {
@@ -331,6 +338,7 @@
}).then(res => res.json())
.then(data => {
recordPageview(path);
firstPageviewSent = true;
if (data && data.id) {
currentEventId = data.id;
// * For SPA navigations the browser never emits a new largest-contentful-paint
@@ -407,14 +415,17 @@
return;
}
var path = cleanPath();
var rawRef = document.referrer || '';
// * Custom events use same referrer logic: only on first pageview, empty after
var referrer = '';
if (rawRef) {
try {
var rh = new URL(rawRef).hostname.replace(/^www\./, '');
var sh = domain.replace(/^www\./, '');
if (rh !== sh) referrer = rawRef;
} catch (e) { referrer = rawRef; }
if (!firstPageviewSent) {
var rawRef = document.referrer || '';
if (rawRef) {
try {
var rh = new URL(rawRef).hostname.replace(/^www\./, '');
var sh = domain.replace(/^www\./, '');
if (rh !== sh) referrer = rawRef;
} catch (e) { referrer = rawRef; }
}
}
var screenSize = { width: window.innerWidth || 0, height: window.innerHeight || 0 };
var payload = {