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  <title>IndexedDB — basic put()</title>
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    body {
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    h1 { margin: 0 0 0.5rem; font-size: 1.25rem; color: #0f172a; }
    p { margin: 0 0 1rem; max-width: 440px; }
    .btns { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; }
    button {
      padding: 0.55rem 1rem;
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      padding: 0.75rem 1rem;
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    code { background: #e2e8f0; padding: 0.1rem 0.35rem; border-radius: 4px; }
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</head>
<body>
  <h1>Update with put()</h1>
  <p>Seed id 1, then run <code>put()</code> to change the contact name.</p>

  <div class="btns">
    <button type="button" id="seedBtn" disabled>1. Seed contact</button>
    <button type="button" id="updateBtn" class="secondary" disabled>2. Update name</button>
  </div>

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

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

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

    openReq.onupgradeneeded = function (event) {
      event.target.result.createObjectStore('contacts', { keyPath: 'id' });
    };

    openReq.onsuccess = function (event) {
      db = event.target.result;
      statusEl.textContent = 'Ready. Seed a contact, then update it.';
      statusEl.className = 'ok';
      document.getElementById('seedBtn').disabled = false;
      document.getElementById('updateBtn').disabled = false;
    };

    openReq.onerror = function (event) {
      statusEl.textContent = 'Open failed: ' + event.target.error.message;
      statusEl.className = 'err';
    };

    document.getElementById('seedBtn').addEventListener('click', function () {
      var tx = db.transaction(['contacts'], 'readwrite');
      var putReq = tx.objectStore('contacts').put({
        id: 1,
        name: 'Alex Rivera',
        email: 'alex@example.com'
      });

      putReq.onsuccess = function () {
        statusEl.textContent = 'Seeded id 1: Alex Rivera';
        statusEl.className = 'ok';
      };
    });

    document.getElementById('updateBtn').addEventListener('click', function () {
      var tx = db.transaction(['contacts'], 'readwrite');
      var putReq = tx.objectStore('contacts').put({
        id: 1,
        name: 'Alex Rivera (Updated)',
        email: 'alex.updated@example.com'
      });

      putReq.onsuccess = function () {
        statusEl.textContent = 'Updated id 1 → name and email changed via put()';
        statusEl.className = 'ok';
      };

      putReq.onerror = function (event) {
        statusEl.textContent = 'Update failed: ' + event.target.error.message;
        statusEl.className = 'err';
      };
    });
  </script>
</body>
</html>
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IndexedDB UPDATE — put() to Replace a Record
