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May 2026

TLS4 Series Automatic Tank Gauges | Smarter Wetstock Management

TLS4 Series: Smarter Fuel Management Starts Below the Surface

Every litre count, and every reading matters across Southeast Asia.From busy city forecourts and highway depots to island kiosks and rural fleet yards, accuracy defines the modern forecourt and visibility shapes its future.

March 17, 2026

By Gilbarco Veeder-Root

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// CONFIG: map UTM parameter names -> input selectors
const fieldMap = {
utm_source: 'input[name="1097612_221968pi_1097612_221968"]',
utm_medium: 'input[name="1097612_221965pi_1097612_221965"]',
utm_campaign: 'input[name="1097612_221959pi_1097612_221959"]',
utm_content: 'input[name="1097612_221962pi_1097612_221962"]'
};

// CONFIG: whether to save values read from the URL into sessionStorage
const saveUrlToSession = true;

function safeSessionGet(key) {
try {
return sessionStorage.getItem(key);
} catch (e) {
return null;
}
}

function safeSessionSet(key, value) {
if (!saveUrlToSession) return;
try {
sessionStorage.setItem(key, value);
} catch (e) {
// ignore storage write failures
}
}

function getUrlParam(paramName) {
const urlParams = new URLSearchParams(window.location.search);
return urlParams.get(paramName); // returns null if not present
}

function populateKey(paramName, selector) {
const el = document.querySelector(selector);

// 1) Try sessionStorage first
const sessVal = safeSessionGet(paramName);
if (sessVal !== null && sessVal !== '') {
setFieldValue(el, sessVal);
return;
}

// 2) Fallback to URL param
const urlVal = getUrlParam(paramName);
if (urlVal !== null && urlVal !== '') {
setFieldValue(el, urlVal);
safeSessionSet(paramName, urlVal); // store for future pages if enabled
}
}

function populateHiddenFields() {
Object.keys(fieldMap).forEach(paramName => {
populateKey(paramName, fieldMap[paramName]);
});
}

if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', populateHiddenFields);
} else {
populateHiddenFields();
}

// Optional: allow manual calls from other scripts
window.populateHiddenFields = populateHiddenFields;

(function () {
// CONFIG
const fieldMap = {
utm_source: 'input[name="1097612_221968pi_1097612_221968"]',
utm_medium: 'input[name="1097612_221965pi_1097612_221965"]',
utm_campaign: 'input[name="1097612_221959pi_1097612_221959"]',
utm_content: 'input[name="1097612_221962pi_1097612_221962"]'
};
const saveUrlToSession = true;

// Safe session helpers
function safeSessionGet(key) {
try { return sessionStorage.getItem(key); } catch (e) { return null; }
}
function safeSessionSet(key, value) {
if (!saveUrlToSession) return;
try { sessionStorage.setItem(key, value); } catch (e) {}
}

// URL helper
function getUrlParam(paramName) {
const urlParams = new URLSearchParams(window.location.search);
return urlParams.get(paramName);
}

// DOM helper
function setFieldValue(el, value) {
if (!el) return;
el.value = value;
el.dispatchEvent(new Event('input', { bubbles: true }));
el.dispatchEvent(new Event('change', { bubbles: true }));
}

// Core: check session first, then URL
function populateKey(paramName, selector) {
const el = document.querySelector(selector);
const sessVal = safeSessionGet(paramName);
if (sessVal !== null && sessVal !== '') {
setFieldValue(el, sessVal);
return;
}
const urlVal = getUrlParam(paramName);
if (urlVal !== null && urlVal !== '') {
setFieldValue(el, urlVal);
safeSessionSet(paramName, urlVal);
}
}

// Populate all configured fields
function populateHiddenFields() {
Object.keys(fieldMap).forEach(paramName => {
populateKey(paramName, fieldMap[paramName]);
});
}

// Init
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', populateHiddenFields);
} else {
populateHiddenFields();
}
window.populateHiddenFields = populateHiddenFields;
})();
</script>

// Get the utm_source value
const utmSource = getUrlParam('utm_source');
const utmMedium = getUrlParam('utm_medium'); // Also get others
const utmCampaign = getUrlParam('utm_campaign');
const utmContent = getUrlParam('utm_content');

// --- Method 1: Direct Assignment (if form fields exist) ---
// Find your form fields by name/ID and set their value
const sourceField = document.querySelector('input[name="1097612_221968pi_1097612_221968"]'); // Adjust selector
if (sourceField && utmSource) {
sourceField.value = utmSource;
}
const mediumField = document.querySelector('input[name="1097612_221965pi_1097612_221965"]'); // Adjust selector
if (mediumField && utmMedium) {
mediumField.value = utmMedium;
}
const campaignField = document.querySelector('input[name="1097612_221959pi_1097612_221959"]'); // Adjust selector
if (campaignField && utmCampaign) {
campaignField.value = utmCampaign;
}
const contentField = document.querySelector('input[name="1097612_221962pi_1097612_221962"]'); // Adjust selector
if (contentField && utmContent) {
contentField.value = utmContent;
}
// Repeat for medium, campaign, etc.

// --- Method 2: Store in Session Storage (Recommended for multi-page) ---
// This keeps data across page views before form submission
if (utmSource) {
sessionStorage.setItem('utm_source', utmSource);
}
if (utmMedium) {
sessionStorage.setItem('utm_medium', utmMedium);
}
if (utmCampaign) {
sessionStorage.setItem('utm_campaign', utmCampaign);
}
if (utmContent) {
sessionStorage.setItem('utm_content', utmContent);
}
});

// Function to populate form on any page load (using session storage)
function populateHiddenFields() {
const utm_source = sessionStorage.getItem('utm_source');
const utm_medium = sessionStorage.getItem('utm_medium');
const utm_campaign = sessionStorage.getItem('utm_campaign');
const utm_content = sessionStorage.getItem('utm_content');

// Run this when the form loads on the *final* page (e.g., the form page itself)
// Call populateHiddenFields(); when your form element is ready or on DOMContentLoaded again.
</script>

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May 2026

TLS4 Series: Smarter Fuel Management Starts Below the Surface

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About Gilbarco Veeder-Root