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document.addEventListener('DOMContentLoaded', function () { // ==== EDIT THESE NUMBERS ==== var formId = 10; // your Gravity Form ID var emailId = 4; // your Email field ID var hiddenId = 18; // your Hidden field ID // ============================ var freeProviders = [ 'gmail.com','yahoo.com','ymail.com','rocketmail.com', 'outlook.com','hotmail.com','live.com','msn.com', 'icloud.com','me.com','mac.com','aol.com','protonmail.com' ]; var emailInput = document.getElementById('input_' + formId + '_' + emailId); var hiddenInput = document.getElementById('input_' + formId + '_' + hiddenId); if (!emailInput || !hiddenInput) return; function extractDomain(email) { if (!email) return ''; email = String(email).trim().toLowerCase(); var at = email.lastIndexOf('@'); if (at === -1) return ''; var domain = email.slice(at + 1).replace(/^[<\s]+|[>\s]+$/g, ''); if (freeProviders.includes(domain)) return ''; // blank if free provider return domain; } function updateHidden() { hiddenInput.value = extractDomain(emailInput.value); } emailInput.addEventListener('input', updateHidden); emailInput.addEventListener('blur', updateHidden); updateHidden(); });