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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>IndexedDB autoIncrement</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>autoIncrement keys</h1>
  <p>Add notes without setting <code>id</code>. Read the generated key from <code>req.result</code>.</p>

  <button type="button" id="addBtn" disabled>Add a note</button>
  <button type="button" id="listBtn" disabled>List notes</button>

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

  <script>
    var statusEl = document.getElementById('status');
    var db;
    var count = 0;

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

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

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

    document.getElementById('addBtn').addEventListener('click', function () {
      count += 1;
      var tx = db.transaction(['notes'], 'readwrite');
      var req = tx.objectStore('notes').add({
        text: 'Note #' + count
      });
      req.onsuccess = function () {
        statusEl.textContent = 'Generated id: ' + req.result;
      };
    });

    document.getElementById('listBtn').addEventListener('click', function () {
      var tx = db.transaction(['notes'], 'readonly');
      var req = tx.objectStore('notes').getAll();
      req.onsuccess = function () {
        var rows = req.result || [];
        if (!rows.length) {
          statusEl.textContent = 'No notes yet.';
          return;
        }
        statusEl.textContent = rows.map(function (n) {
          return n.id + ': ' + n.text;
        }).join(' | ');
      };
    });
  </script>
</body>
</html>
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IndexedDB Insert — autoIncrement Keys
