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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>Web SQL — delete by id</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; }
    label { display: block; margin-bottom: 0.35rem; font-size: 0.875rem; font-weight: 600; }
    input {
      display: block;
      width: 100%;
      max-width: 120px;
      padding: 0.5rem 0.65rem;
      margin-bottom: 0.75rem;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      font-size: 1rem;
    }
    button {
      padding: 0.55rem 1rem;
      font-size: 0.9375rem;
      background: #dc2626;
      color: #fff;
      border: none;
      border-radius: 8px;
      cursor: pointer;
    }
    button:hover { background: #b91c1c; }
    #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; }
  </style>
</head>
<body>
  <h1>Delete by id</h1>

  <label for="rowId">Row id to delete</label>
  <input type="number" id="rowId" value="1" min="1">
  <button type="button" id="deleteBtn">Delete Row</button>

  <p id="status">Rows 1–3 are pre-seeded. Enter an id and click Delete.</p>

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

    if (!window.openDatabase) {
      statusEl.textContent = 'Web SQL is not supported in this browser.';
      statusEl.className = 'err';
    } else {
      var db = openDatabase('tryitDemo', '1.0', 'Try It DB', 1024 * 1024);

      db.transaction(function (tx) {
        tx.executeSql('CREATE TABLE IF NOT EXISTS items (id INTEGER PRIMARY KEY, name TEXT)');
        [[1, 'Apple'], [2, 'Banana'], [3, 'Cherry']].forEach(function (row) {
          tx.executeSql(
            'INSERT OR IGNORE INTO items (id, name) VALUES (?, ?)',
            row
          );
        });
      });

      document.getElementById('deleteBtn').addEventListener('click', function () {
        var id = parseInt(idEl.value, 10);
        if (isNaN(id)) {
          statusEl.textContent = 'Please enter a valid id.';
          statusEl.className = 'err';
          return;
        }

        db.transaction(function (tx) {
          tx.executeSql(
            'DELETE FROM items WHERE id = ?',
            [id],
            function (tx, result) {
              statusEl.textContent = result.rowsAffected
                ? 'Deleted id ' + id + ' (' + result.rowsAffected + ' row)'
                : 'No row with id ' + id + ' found';
              statusEl.className = result.rowsAffected ? 'ok' : 'err';
            },
            function (tx, error) {
              statusEl.textContent = 'Error: ' + error.message;
              statusEl.className = 'err';
              return true;
            }
          );
        });
      });
    }
  </script>
</body>
</html>
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Web SQL DELETE — Remove by ID Input
