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document.addEventListener("DOMContentLoaded", function () { let phoneField = document.querySelector("input[name='phone_number']"); if (phoneField) { phoneField.addEventListener("input", function () { let usPhoneRegex = /^(?:\+1|1)?\s*\(?[2-9][0-9]{2}\)?[-.\s]?[0-9]{3}[-.\s]?[0-9]{4}$/; if (!usPhoneRegex.test(phoneField.value)) { phoneField.setCustomValidity("Please enter a valid US phone number (e.g., (505) 123-4567 or 505-123-4567)."); } else { phoneField.setCustomValidity(""); } }); } // Prevent form submission if phone number is invalid let form = document.querySelector("form"); if (form) { form.addEventListener("submit", function (event) { if (phoneField && !phoneField.checkValidity()) { event.preventDefault(); // Stop form submission alert("Please enter a valid US phone number before submitting."); } }); } });