document.addEventListener('DOMContentLoaded', function() { var form = document.querySelector('.elementor-form'); var checkbox = form.querySelector('.elementor-field-option input[type="checkbox"]'); var submitButton = form.querySelector('button[type="submit"]'); submitButton.addEventListener('click', function(event) { if (!checkbox.checked) { event.preventDefault(); alert('Please check the required checkbox before submitting.'); } }); });