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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 openCursor()</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>openCursor()</h1>
  <p>Iterate records one at a time with <code>continue()</code>.</p>

  <button type="button" id="seedBtn" disabled>Seed 2 contacts</button>
  <button type="button" id="cursorBtn" disabled>Walk with cursor</button>

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

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

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

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

    openReq.onsuccess = function (event) {
      db = event.target.result;
      statusEl.textContent = 'Ready.';
      document.getElementById('seedBtn').disabled = false;
      document.getElementById('cursorBtn').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' });
      store.put({ id: 2, name: 'Sam Lee' });
      tx.oncomplete = function () {
        statusEl.textContent = 'Seeded 2 contacts.';
      };
    });

    document.getElementById('cursorBtn').addEventListener('click', function () {
      var parts = [];
      var tx = db.transaction(['contacts'], 'readonly');
      var req = tx.objectStore('contacts').openCursor();

      req.onsuccess = function () {
        var cursor = req.result;
        if (!cursor) {
          statusEl.textContent = parts.length
            ? parts.join(' → ') + ' → Done'
            : 'No records.';
          return;
        }
        parts.push(cursor.key + ' ' + cursor.value.name);
        cursor.continue();
      };
    });
  </script>
</body>
</html>
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IndexedDB Retrieve — openCursor()
