<p><script>
document.addEventListener('DOMContentLoaded', function () {
  const form = document.querySelector('form');
  if (!form) return;

  form.addEventListener('submit', function (event) {
    const dropdown = document.querySelector('[placeholder="shipping_option"]');
    if (!dropdown) return;

    const selectedValue = dropdown.value.trim();

    if (!selectedValue) {
      alert("⚠ No shipping option selected.");
      return;
    }

    const encodedValue = encodeURIComponent(selectedValue);
    const redirectURL = `https://www.revdocshipping.ca/payment-redirect?shipping_option=${encodedValue}`;

    event.preventDefault(); // prevent default form submission
    window.location.href = redirectURL; // redirect to payment
  });
});
</script></p>