/* === Mailchimp MERGE4 (GCLID/GBRAID/WBRAID) autofill === */
(function () {
var DEBUG = false; // set true to see logs
var COOKIE_MAX_AGE = 60*60*24*90; // 90 days
var FIELD_SELECTOR = 'input[name="MERGE4"], #mce-GCLID';
function log(){ if (DEBUG) try{ console.log.apply(console, arguments);}catch(e){} }
function qp(n){ try { return new URLSearchParams(location.search).get(n) || ''; } catch(e){ return ''; } }
function setCookie(k,v){ document.cookie = k + "=" + encodeURIComponent(v) + ";path=/;max-age="+COOKIE_MAX_AGE+";SameSite=Lax"; }
function getCookie(k){ var m=document.cookie.match(new RegExp('(?:^|;\\s*)'+k+'=([^;]+)')); return m?decodeURIComponent(m[1]):''; }
function fromGclAw(raw){ if(!raw) return ''; var p=raw.split('.'); return p.length>=3?p[2]:''; }
// 1) Capture from URL once and persist
var fromUrl = qp('gclid') || qp('gbraid') || qp('wbraid') || '';
if (fromUrl) {
setCookie('google_click_id', fromUrl);
try { localStorage.setItem('google_click_id', fromUrl); } catch(e){}
log('[MERGE4] captured from URL:', fromUrl);
}
// 2) Read value (cookie/localStorage/_gcl_aw fallback)
function readId(){
var id = getCookie('google_click_id');
if (!id) { try { id = localStorage.getItem('google_click_id') || ''; } catch(e){} }
if (!id) { id = fromGclAw(getCookie('_gcl_aw')) || ''; }
return id;
}
// 3) Apply to any Mailchimp form on the page (and future ones)
function apply(){
var id = readId();
if (!id) { log('[MERGE4] no id found yet'); return; }
// Ensure field exists and is filled
document.querySelectorAll('form').forEach(function(form){
if (!/list-manage\.com\/subscribe/i.test(form.action)) return;
var el = form.querySelector(FIELD_SELECTOR);
if (!el) {
el = document.createElement('input');
el.type = 'hidden';
el.name = 'MERGE4';
el.id = 'mce-GCLID';
form.appendChild(el);
log('[MERGE4] injected hidden field into form:', form.action);
}
if (!el.value) el.value = id;
el.type='hidden'; el.hidden=true; el.style.display='none'; el.style.visibility='hidden';
log('[MERGE4] value set:', el.value);
// Safety: ensure value at submit time
if (!form.__merge4Bound) {
form.__merge4Bound = true;
form.addEventListener('submit', function(){
var latest = readId();
if (latest && !el.value) el.value = latest;
log('[MERGE4] on submit value:', el.value);
}, true);
}
});
}
// Run now + watch for late-loaded forms
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', apply);
} else {
apply();
}
new MutationObserver(apply).observe(document.documentElement, {childList:true, subtree:true});
})();
