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Free Gift: TruSource Tracking Script
The script below can be placed on a website that stores paid/organic source information in a cookie, so that you don’t lose data on where leads come from. When a lead fills out a form, all of the source information is dynamically added to Marketo. And if you’re using Marketo forms, then hidden fields aren’t even needed. Copy and save the script below!
<script>
// JavaScript Document
/********************************************************************
* === Code block Update starts here === *
* Code has been modernized to use original marketo forms script *
* Also uses a variable for code reuse *
* Update added - December 3th, 2025 *
********************************************************************/
// IIFE to prevent global variable pollution
(function () {
const GA4_MEASUREMENT_ID = '' // 🚨🚨 Replace with your GA4 measurement ID G-XXXXXXXXXX
// Variables moved inside IIFE to avoid global scope pollution
var source,
medium,
term,
content,
campaign;
// Flag to track initialization state - prevents duplicate processing
var isInitialized = false;
/********************************************************************
* === jQuery and MktoForms2 Loading === *
********************************************************************/
// Load jQuery if not already available
if (typeof (jQuery) == 'undefined') {
var script = document.createElement('script');
script.src = 'https://code.jquery.com/jquery-3.4.1.min.js';
script.type = 'text/javascript';
document.getElementsByTagName('head')[0].appendChild(script);
}
// Load Marketo Forms JS if not already available
if (typeof (MktoForms2) == 'undefined') {
var script = document.createElement('script');
script.src = 'https://app-sjst.marketo.com/js/forms2/js/forms2.min.js';
script.type = 'text/javascript';
document.getElementsByTagName('head')[0].appendChild(script);
}
// Get hostname for domain configuration
var hostname = document.location.hostname;
var hostnameMatch = hostname.match(/(([^.\/]+\.[^.\/]{2,3}\.[^.\/]{2})|(([^.\/]+\.)[^.\/]{2,5}))(\/.*)?$/);
if (hostnameMatch) {
hostname = hostnameMatch[1].toLowerCase();
}
// Define domains for cross-domain tracking
var domains = [];
domains.push(hostname);
/********************************************************************
* === GA4 Implementation === *
********************************************************************/
// Load Google Analytics 4 script (gtag.js) only if not already loaded
function setupGA4() {
// Check if gtag is already defined
if (typeof gtag === 'undefined') {
// Check if the script is already loaded
var gtagScriptExists = false;
var scripts = document.getElementsByTagName('script');
for (var i = 0; i < scripts.length; i++) {
if (scripts[i].src && scripts[i].src.indexOf('googletagmanager.com/gtag/js') !== -1) {
gtagScriptExists = true;
break;
}
}
// If gtag script doesn't exist, load it
if (!gtagScriptExists) {
var gtagScript = document.createElement('script');
gtagScript.async = true;
gtagScript.src = `https://www.googletagmanager.com/gtag/js?id=${GA4_MEASUREMENT_ID}`;
document.head.appendChild(gtagScript);
// Initialize gtag
window.dataLayer = window.dataLayer || [];
window.gtag = function () { dataLayer.push(arguments); };
gtag('js', new Date());
} else {
// Script exists but gtag isn't defined yet, define it
window.dataLayer = window.dataLayer || [];
window.gtag = function () { dataLayer.push(arguments); };
}
}
// Configure your GA4 property with cross-domain tracking
// (This will run regardless of whether we just loaded gtag or it was already there)
gtag('config', GA4_MEASUREMENT_ID, {
'cookie_domain': hostname,
'linker': {
'domains': domains
}
});
// Set up GA4 linker
if (typeof gtag !== 'undefined') {
gtag('set', 'linker', {
'domains': domains,
'decorate_forms': true
});
}
}
// Setup cross-domain link tracking - moved to a function to control when it runs
function setupCrossDomainLinks() {
// Only run once
if (window.crossDomainLinksInitialized) {
return;
}
window.crossDomainLinksInitialized = true;
var arr = document.getElementsByTagName('a');
for (var i = 0; i < arr.length; i++) {
var tmp = arr[i].getAttribute('onclick');
var doname = '';
try {
doname = arr[i].hostname.match(/(([^.\/]+\.[^.\/]{2,3}\.[^.\/]{2})|(([^.\/]+\.)[^.\/]{2,4}))(\/.*)?$/)[1];
doname = doname.toLowerCase();
} catch (err) {
doname = arr[i].href;
}
if (tmp != null) {
tmp = String(tmp);
if (tmp.indexOf('gtag(') > -1) continue; // Skip if already processed
}
for (var j = 0; j < domains.length; j++) {
//auto-linker
if (doname != hostname && doname.indexOf(domains[j]) != -1 && doname.indexOf('mailto:') == -1) {
arr[i].setAttribute('onclick', '' + ((tmp != null) ? tmp + '; ' : '') +
"gtag('event', 'click', {" +
"'event_category': 'outbound'," +
"'event_label': '" + arr[i].href + "'," +
"'transport_type': 'beacon'," +
"'event_callback': function(){document.location = '" + arr[i].href + "'}" +
"}); return false;");
}
}
}
}
// Initialize all tracking - this is our main entry point
function initializeTracking() {
// Only run once
if (isInitialized) {
return;
}
isInitialized = true;
// Set up GA4
setupGA4();
// Handle cross-domain link tracking
setupCrossDomainLinks();
// Continue with cookie handling and form population
checkJQueryAndMarketo();
}
// Check for jQuery and Marketo availability
function checkJQueryAndMarketo() {
// Use a counter to limit the number of retries
if (!window.checkJQueryRetryCount) {
window.checkJQueryRetryCount = 0;
}
if ((typeof jQuery === 'undefined' || typeof MktoForms2 === 'undefined') && window.checkJQueryRetryCount < 20) {
window.checkJQueryRetryCount++;
setTimeout(checkJQueryAndMarketo, 500);
} else {
// Continue with script execution after libraries are loaded
// or after 10 seconds (20 * 500ms) to prevent infinite waiting
setTimeout(executeMainScript, 2000);
}
}
// Main script execution
function executeMainScript() {
if (!jQuery) {
console.warn("jQuery not available - some functionality will be limited");
return;
}
//domain finder helper function
function get_top_domain() {
var i, h,
top_cookie = 'get_top_level_domain=cookie',
hostname = document.location.hostname.split('.');
for (i = hostname.length - 1; i >= 0; i--) {
h = hostname.slice(i).join('.');
document.cookie = top_cookie + ';domain=.' + h + ';';
if (document.cookie.indexOf(top_cookie) > -1) {
document.cookie = top_cookie.split('=')[0] + '=;domain=.' + h + ';expires=Thu, 01 Jan 1970 00:00:01 GMT;';
return h;
}
}
}
function fullyDecodeURI(uri) {
var x = 0;
while (uri !== decodeURIComponent(uri) && x < 5) {
uri = decodeURIComponent(uri);
x = x + 1;
}
return uri;
}
//cookie helper function
jQuery.saCookie = function (options) {
var settings = jQuery.extend({
name: "",
value: "",
expiry: "",
path: "",
domain: ""
}, options);
if (settings.name == "") {
return "error, no name specified";
}
if (settings.value == "") {
//get cookie
if (document.cookie.length > 0) {
c_start = document.cookie.indexOf(settings.name + "=");
if (c_start != -1) {
c_start = c_start + settings.name.length + 1;
c_end = document.cookie.indexOf(";", c_start);
if (c_end == -1) c_end = document.cookie.length;
return fullyDecodeURI(document.cookie.substring(c_start, c_end));
}
return "";
}
return "";
} else {
//set cookie
var exdate = new Date();
exdate.setTime(exdate.getTime() + parseInt(settings.expiry));
document.cookie = settings.name + "=" + encodeURIComponent(settings.value) +
((settings.expiry == "") ? "" : ";expires=" + exdate.toUTCString()) +
";domain=" + ((settings.domain == "") ? "" : settings.domain) +
";path=" + ((settings.path == "") ? "/" : settings.path);
return settings.value;
}
}
//get the top level domain
var topDomain = '.' + get_top_domain();
//set the query string params
var fullQueryString = location.search.substring(1);
var splitQueryString = fullQueryString.split('&');
//set cookie names
var utmCampaignCName = '_mkto_adv1';
var utmContentCName = '_mkto_adv2';
var utmMediumCName = '_mkto_adv3';
var utmTermCName = '_mkto_adv4';
var utmSourceCName = '_mkto_adv5';
//dictionary key: parameter, value: field name
var dict = {
"utm_campaign__c": utmCampaignCName,
"utm_content__c": utmContentCName,
"utm_medium__c": utmMediumCName,
"utm_source__c": utmSourceCName,
"utm_term__c": utmTermCName
};
for (var x = 0; x < splitQueryString.length; x++) {
if (!splitQueryString[x]) continue;
var parts = splitQueryString[x].split('=');
if (parts.length < 2) continue;
var paramName = parts[0];
var paramValue = parts[1];
var mktoName = dict[paramName];
if (mktoName != null && !jQuery.saCookie({ name: mktoName + 'orig' })) {
jQuery.saCookie({ name: mktoName + 'orig', value: paramValue, domain: topDomain, expiry: 1209600000 });
}
if (mktoName != null) {
jQuery.saCookie({ name: mktoName + 'mr', value: paramValue, domain: topDomain, expiry: 1209600000 });
}
}
// Extract UTM params from GA4
var gaUTMProcessingTimer = setTimeout(function () {
// Clear the timer reference to allow garbage collection
gaUTMProcessingTimer = null;
// GA4 uses _ga_* cookies instead of __utmz
// We'll extract UTM parameters from URL or dataLayer
var GATrafficSource = (function () {
// For GA4, we need to extract from gtag parameters or URL
if (window.dataLayer) {
// Look for the most recent config or event with campaign parameters
for (var i = window.dataLayer.length - 1; i >= 0; i--) {
var item = window.dataLayer[i];
if (item && (item.event === 'gtm.js' || item.event === 'config')) {
// Check if this dataLayer push has campaign parameters
if (item.utm_source || item.utm_medium || item.utm_campaign ||
item.utm_content || item.utm_term) {
return {
'utm_source__c': item.utm_source,
'utm_medium__c': item.utm_medium,
'utm_campaign__c': item.utm_campaign,
'utm_content__c': item.utm_content,
'utm_term__c': item.utm_term
};
}
}
}
}
// Fallback: extract from URL parameters
var params = {};
var queryString = window.location.search.substring(1);
var pairs = queryString.split('&');
for (var i = 0; i < pairs.length; i++) {
if (!pairs[i]) continue;
var pair = pairs[i].split('=');
var key = decodeURIComponent(pair[0]);
var value = pair.length > 1 ? decodeURIComponent(pair[1]) : '';
// Check if key is a UTM parameter
if (key.indexOf('utm_') === 0) {
var utmKey = key + '__c';
params[utmKey] = value;
}
}
// If we have at least one parameter, return the params object
return Object.keys(params).length > 0 ? params : null;
})();
// assuming GATrafficSource isn't null...
if (GATrafficSource) {
var existingURL_UTMparams = [];
for (var y = 0; y < splitQueryString.length; y++) {
if (!splitQueryString[y]) continue;
var parts = splitQueryString[y].split('=');
if (parts.length > 0) {
existingURL_UTMparams.push(parts[0]);
}
}
// Set GA4's UTM values as cookies
for (var key in GATrafficSource) {
// Skip undefined values
if (GATrafficSource[key] === undefined) continue;
var mktoName = dict[key];
// Skip if no matching Marketo field
if (!mktoName) continue;
// assuming utm original value cookie hasn't been set
if (!jQuery.saCookie({ name: mktoName + 'orig' })) {
jQuery.saCookie({ name: mktoName + 'orig', value: GATrafficSource[key], domain: topDomain, expiry: 1209600000 });
}
// assuming utm most recent value cookie hasn't been set
if (existingURL_UTMparams.indexOf(key) === -1) {
jQuery.saCookie({ name: mktoName + 'mr', value: GATrafficSource[key], domain: topDomain, expiry: 1209600000 });
}
}
// Attempt to populate forms with new data
populateFormsWithUTMData();
}
}, 2000);
// Form population function - fixed the default parameter issue for GTM compatibility
function populateForm(form) {
if (form === undefined || form === null) {
form = null;
}
if (jQuery.saCookie({ name: utmCampaignCName + 'orig' })) {
if (jQuery("input[name=utm_campaign__c]").length > 0) {
jQuery("input[name=utm_campaign__c]").val(jQuery.saCookie({ name: utmCampaignCName + 'orig' }));
} else if (form) {
form.addHiddenFields({ "utm_campaign__c": jQuery.saCookie({ name: utmCampaignCName + 'orig' }) });
}
}
if (jQuery.saCookie({ name: utmCampaignCName + 'mr' })) {
if (jQuery("input[name=mktoUTMCampaign]").length > 0) {
jQuery("input[name=mktoUTMCampaign]").val(jQuery.saCookie({ name: utmCampaignCName + 'mr' }));
} else if (form) {
form.addHiddenFields({ "mktoUTMCampaign": jQuery.saCookie({ name: utmCampaignCName + 'mr' }) });
}
}
if (jQuery.saCookie({ name: utmContentCName + 'orig' })) {
if (jQuery("input[name=utm_content__c]").length > 0) {
jQuery("input[name=utm_content__c]").val(jQuery.saCookie({ name: utmContentCName + 'orig' }));
} else if (form) {
form.addHiddenFields({ "utm_content__c": jQuery.saCookie({ name: utmContentCName + 'orig' }) });
}
}
if (jQuery.saCookie({ name: utmContentCName + 'mr' })) {
if (jQuery("input[name=mkto_UTM_Content]").length > 0) {
jQuery("input[name=mkto_UTM_Content]").val(jQuery.saCookie({ name: utmContentCName + 'mr' }));
} else if (form) {
form.addHiddenFields({ "mkto_UTM_Content": jQuery.saCookie({ name: utmContentCName + 'mr' }) });
}
}
if (jQuery.saCookie({ name: utmMediumCName + 'orig' })) {
if (jQuery("input[name=utm_medium__c]").length > 0) {
jQuery("input[name=utm_medium__c]").val(jQuery.saCookie({ name: utmMediumCName + 'orig' }));
} else if (form) {
form.addHiddenFields({ "utm_medium__c": jQuery.saCookie({ name: utmMediumCName + 'orig' }) });
}
}
if (jQuery.saCookie({ name: utmMediumCName + 'mr' })) {
if (jQuery("input[name=mktoUTMMedium]").length > 0) {
jQuery("input[name=mktoUTMMedium]").val(jQuery.saCookie({ name: utmMediumCName + 'mr' }));
} else if (form) {
form.addHiddenFields({ "mktoUTMMedium": jQuery.saCookie({ name: utmMediumCName + 'mr' }) });
}
}
if (jQuery.saCookie({ name: utmTermCName + 'orig' })) {
if (jQuery("input[name=utm_term__c]").length > 0) {
jQuery("input[name=utm_term__c]").val(jQuery.saCookie({ name: utmTermCName + 'orig' }));
} else if (form) {
form.addHiddenFields({ "utm_term__c": jQuery.saCookie({ name: utmTermCName + 'orig' }) });
}
}
if (jQuery.saCookie({ name: utmTermCName + 'mr' })) {
if (jQuery("input[name=mktoUTMTemp]").length > 0) {
jQuery("input[name=mktoUTMTemp]").val(jQuery.saCookie({ name: utmTermCName + 'mr' }));
} else if (form) {
form.addHiddenFields({ "mktoUTMTemp": jQuery.saCookie({ name: utmTermCName + 'mr' }) });
}
}
if (jQuery.saCookie({ name: utmSourceCName + 'orig' })) {
if (jQuery("input[name=utm_source__c]").length > 0) {
jQuery("input[name=utm_source__c]").val(jQuery.saCookie({ name: utmSourceCName + 'orig' }));
} else if (form) {
form.addHiddenFields({ "utm_source__c": jQuery.saCookie({ name: utmSourceCName + 'orig' }) });
}
}
if (jQuery.saCookie({ name: utmSourceCName + 'mr' })) {
if (jQuery("input[name=mktoUTMSource]").length > 0) {
jQuery("input[name=mktoUTMSource]").val(jQuery.saCookie({ name: utmSourceCName + 'mr' }));
} else if (form) {
form.addHiddenFields({ "mktoUTMSource": jQuery.saCookie({ name: utmSourceCName + 'mr' }) });
}
}
}
// Function to handle form population
function populateFormsWithUTMData() {
// For non-Marketo forms
if (jQuery("form").length > 0) {
populateForm();
}
// For Marketo forms
if (typeof (MktoForms2) != 'undefined') {
// Use the global whenReady instead of binding to each form
// This reduces the number of listeners
MktoForms2.whenReady(function (form) {
populateForm(form);
});
}
}
// Initialize form population once
populateFormsWithUTMData();
}
// Start the initialization process
initializeTracking();
})();
</script>