laermsensor-stack/espid2sensor/public/login.js

// public/login.js
document.addEventListener('DOMContentLoaded', () => {
  const emailInput = document.getElementById('email');
  const emailStatus = document.getElementById('emailStatus');
  let debounceTimeout;

  emailInput.addEventListener('input', () => {
    clearTimeout(debounceTimeout);
    const email = emailInput.value.trim();

    if (!email) {
      emailStatus.textContent = '';
      return;
    }

    debounceTimeout = setTimeout(async () => {
      try {
        const res = await fetch(`/api/check-email?email=${encodeURIComponent(email)}`);
        const data = await res.json();
        if (data.exists) {
          emailStatus.textContent = '✅ Benutzer existiert';
          emailStatus.style.color = 'green';
        } else {
          emailStatus.textContent = '❌ Benutzer nicht gefunden';
          emailStatus.style.color = 'red';
        }
      } catch (err) {
        console.error(err);
        emailStatus.textContent = 'Fehler bei der Prüfung';
        emailStatus.style.color = 'orange';
      }
    }, 300);
  });
});