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 add()</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>Add a record</h1>
  <button type="button" id="addBtn" disabled>add() contact id 1</button>
  <p id="status">Opening&hellip;</p>

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

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

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

    openReq.onsuccess = function (event) {
      db = event.target.result;
      statusEl.textContent = 'Ready.';
      addBtn.disabled = false;
    };

    addBtn.addEventListener('click', function () {
      var tx = db.transaction(['contacts'], 'readwrite');
      var req = tx.objectStore('contacts').add({
        id: 1,
        name: 'Alex Rivera',
        email: 'alex@example.com'
      });
      req.onsuccess = function () {
        statusEl.textContent = 'Inserted key: ' + req.result;
      };
      req.onerror = function () {
        statusEl.textContent = 'Error: ' + req.error.name;
      };
    });
  </script>
</body>
</html>

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IndexedDB — Add a Record