Blacklist domain

blacklist-domain.html

<script>
  const restrictedDomains = [
    '@example.com',
    '@foo.bar'
  ];

  async function initEmailCheck() {
    try {
      const emailInput = await waitForElementPromise('#EMAIL_2');
      const submitButton = await waitForElementPromise('#submit-button');

      submitButton.addEventListener('click', function (event) {
        const email = emailInput.value.toLowerCase();
        const isRestricted = restrictedDomains.some(domain =>
          email.includes(domain.toLowerCase())
        );

        let errorMsg = document.getElementById('email-error-message');

        if (isRestricted) {
          event.preventDefault(); // Prevent form submission
          emailInput.style.borderColor = 'red';

          if (!errorMsg) {
            errorMsg = document.createElement('div');
            errorMsg.id = 'email-error-message';
            errorMsg.style.color = 'red';
            errorMsg.style.fontSize = '12px';
            errorMsg.textContent = 'Something went wrong.';
            emailInput.parentNode.appendChild(errorMsg);
          }
        } else {
          emailInput.style.borderColor = '';

          if (errorMsg) {
            errorMsg.remove();
          }
        }
      });
    } catch (error) {
      console.error('Error initializing email check:', error);
    }
  }

  if (window.location.href.includes('/register')) {
    initEmailCheck();
  }
</script>