HTML Code
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Web SQL — insert from input</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: 280px;
      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: #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>Insert from user input</h1>

  <label for="itemName">Item name</label>
  <input type="text" id="itemName" placeholder="e.g. Notebook" value="Notebook">
  <button type="button" id="addBtn">Add Item</button>

  <p id="status">Enter a name and click Add Item.</p>

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

    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);
      var nextId = 1;

      db.transaction(function (tx) {
        tx.executeSql(
          'CREATE TABLE IF NOT EXISTS items (id INTEGER PRIMARY KEY, name TEXT)'
        );
      });

      document.getElementById('addBtn').addEventListener('click', function () {
        var name = inputEl.value.trim();
        if (!name) {
          statusEl.textContent = 'Please type an item name first.';
          statusEl.className = 'err';
          return;
        }

        db.transaction(function (tx) {
          tx.executeSql(
            'INSERT INTO items (id, name) VALUES (?, ?)',
            [nextId++, name],
            function () {
              statusEl.textContent = 'Saved: ' + name + ' (uses ? bindings, not string concat)';
              statusEl.className = 'ok';
              inputEl.value = '';
              inputEl.focus();
            },
            function (tx, error) {
              statusEl.textContent = 'Error: ' + error.message;
              statusEl.className = 'err';
              return true;
            }
          );
        });
      });
    }
  </script>
</body>
</html>
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Web SQL INSERT — Add Item from Input
