HTML Code
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>IndexedDB index get()</title>
  <style>
    body { font-family: system-ui, sans-serif; margin: 1.5rem; line-height: 1.5; }
    button { margin-right: 0.5rem; margin-bottom: 0.5rem; padding: 0.5rem 0.9rem; cursor: pointer; }
    #status { margin-top: 1rem; }
  </style>
</head>
<body>
  <h1>Index lookup</h1>
  <p>Find a contact by email using <code>store.index('by_email').get(...)</code>.</p>

  <button type="button" id="seedBtn" disabled>Seed contacts</button>
  <button type="button" id="findBtn" disabled>Find alex@example.com</button>
  <button type="button" id="missBtn" disabled>Find missing email</button>

  <p id="status">Opening database&hellip;</p>

  <script>
    var statusEl = document.getElementById('status');
    var db;

    var openReq = indexedDB.open('tryitRetrieveIndex', 1);

    openReq.onupgradeneeded = function (event) {
      var store = event.target.result.createObjectStore('contacts', { keyPath: 'id' });
      store.createIndex('by_email', 'email', { unique: true });
    };

    openReq.onsuccess = function (event) {
      db = event.target.result;
      statusEl.textContent = 'Ready.';
      ['seedBtn', 'findBtn', 'missBtn'].forEach(function (id) {
        document.getElementById(id).disabled = false;
      });
    };

    document.getElementById('seedBtn').addEventListener('click', function () {
      var tx = db.transaction(['contacts'], 'readwrite');
      var store = tx.objectStore('contacts');
      store.put({ id: 1, name: 'Alex Rivera', email: 'alex@example.com' });
      store.put({ id: 2, name: 'Sam Lee', email: 'sam@example.com' });
      tx.oncomplete = function () {
        statusEl.textContent = 'Seeded contacts with email index.';
      };
    });

    function findEmail(email) {
      var tx = db.transaction(['contacts'], 'readonly');
      var req = tx.objectStore('contacts').index('by_email').get(email);
      req.onsuccess = function () {
        if (!req.result) {
          statusEl.textContent = 'No match for ' + email;
          return;
        }
        statusEl.textContent = 'Found: ' + req.result.name;
      };
    }

    document.getElementById('findBtn').addEventListener('click', function () {
      findEmail('alex@example.com');
    });

    document.getElementById('missBtn').addEventListener('click', function () {
      findEmail('nobody@example.com');
    });
  </script>
</body>
</html>
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IndexedDB Retrieve — Index Lookup
