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<head>
  <meta charset="UTF-8">
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  <title>IndexedDB — basic add()</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      margin: 0;
      padding: 1.5rem;
      background: #f8fafc;
      color: #334155;
      line-height: 1.6;
    }
    h1 { margin: 0 0 0.5rem; font-size: 1.25rem; color: #0f172a; }
    p { margin: 0 0 1rem; max-width: 420px; }
    button {
      padding: 0.55rem 1rem;
      font-size: 0.9375rem;
      background: #2563eb;
      color: #fff;
      border: none;
      border-radius: 8px;
      cursor: pointer;
    }
    button:hover { background: #1d4ed8; }
    #status {
      margin-top: 1rem;
      padding: 0.75rem 1rem;
      max-width: 420px;
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      font-size: 0.875rem;
    }
    #status.ok { border-left: 4px solid #22c55e; }
    #status.err { border-left: 4px solid #ef4444; }
    code { background: #e2e8f0; padding: 0.1rem 0.35rem; border-radius: 4px; }
  </style>
</head>
<body>
  <h1>Add one record</h1>
  <p>Click the button to run <code>objectStore.add()</code> inside a readwrite transaction.</p>

  <button type="button" id="addBtn" disabled>Add Sample Contact</button>
  <p id="status">Opening database&hellip;</p>

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

    if (!window.indexedDB) {
      statusEl.textContent = 'IndexedDB is not supported in this browser.';
      statusEl.className = 'err';
    } else {
      var request = indexedDB.open('tryitInsertDemo', 1);

      request.onupgradeneeded = function (event) {
        var database = event.target.result;
        if (!database.objectStoreNames.contains('contacts')) {
          database.createObjectStore('contacts', { keyPath: 'id', autoIncrement: true });
        }
      };

      request.onsuccess = function (event) {
        db = event.target.result;
        statusEl.textContent = 'Database ready. Click the button to add a contact.';
        statusEl.className = 'ok';
        addBtn.disabled = false;
      };

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

      addBtn.addEventListener('click', function () {
        var tx = db.transaction(['contacts'], 'readwrite');
        var store = tx.objectStore('contacts');
        var item = { name: 'Alex Rivera', email: 'alex@example.com' };
        var addReq = store.add(item);

        addReq.onsuccess = function () {
          statusEl.textContent = 'Added contact! Auto-generated id: ' + addReq.result;
          statusEl.className = 'ok';
        };

        addReq.onerror = function (event) {
          statusEl.textContent = 'Add failed: ' + event.target.error.message;
          statusEl.className = 'err';
        };
      });
    }
  </script>
</body>
</html>
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IndexedDB INSERT — Batch Add in One Transaction
