HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>event.data payload</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #save { padding: 10px 18px; background: #2563eb; color: #fff; border: none; border-radius: 8px; cursor: pointer; }
    #out { margin-top: 12px; color: #1d4ed8; font-weight: bold; }
  </style>
</head>
<body>
  <button type="button" id="save">Save draft</button>
  <p id="out">Click the button.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#save").on("click", { id: 42, label: "Save draft" }, function (event) {
      $("#out").text(event.data.id + ": " + event.data.label);
    });
  </script>
</body>
</html>

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jQuery event.data — simple payload (Try It)