<script>
document.addEventListener('DOMContentLoaded',
function() { var urlParams = new
URLSearchParams(window.location.search); var
mapping = { 'utm_source': 'last_utm_source',
'utm_medium': 'last_utm_medium', 'utm_campaign':
'last_utm_campaign', 'utm_term': 'last_utm_term' };
Object.keys(mapping).forEach(function(param) { var
value = urlParams.get(param); if (value) { var input =
document.querySelector('input[name="' +
mapping[param] + '"]'); if (input) { input.value = value; }
} }); }); </script>