Gclid hidden field - hector - coa/signup

<script>
  (function() {
    // document.querySelector('li.custom-field').style.display = 'block'; //Show the hidden field
    var url = new URL({{cookie - __gtm_campaign_url}}),
      params = new URLSearchParams(url.search),
      value = params.get('gclid'),
      selector = 'textarea#UsrCustFldEdt6.textbox',
      field = document.querySelector(selector);

    if (value) {
      field.value = value;
    }
  })();
</script>