document.addEventListener("DOMContentLoaded", function() {
var checkoutForm = document.querySelector('form.ec-form'); // Use the correct form selector
checkoutForm.addEventListener('submit', function(event) {
var cityField = document.getElementById('ec-city-list');
if(cityField && cityField.value === '') {
event.preventDefault(); // Stop form from submitting
alert('Please enter your city.');
cityField.focus(); // Bring focus to the city field
}
});
});