HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mousedown eventData</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    .tool { padding: 10px 16px; margin-right: 8px; border: 1px solid #cbd5e1; background: #f8fafc; border-radius: 6px; cursor: pointer; user-select: none; }
    .tool:hover { background: #e0e7ff; }
    #out { margin-top: 12px; color: #4338ca; font-weight: bold; }
  </style>
</head>
<body>
  <button type="button" class="tool" data-tool="pen">Pen</button>
  <button type="button" class="tool" data-tool="brush">Brush</button>
  <div id="out">Press a tool button.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $(".tool").mousedown({ mode: "draw" }, function(event) {
      var tool = $(this).data("tool");
      $("#out").text("Tool: " + tool + " | eventData.mode: " + event.data.mode);
    });
  </script>
</body>
</html>

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jQuery .mousedown(eventData, handler) — Try It