HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>event.which mousedown demo</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }

    #mousedown-area { height: 100px; background: #ffd; border: 1px solid #ca8; border-radius: 6px; display: flex; align-items: center; justify-content: center; cursor: pointer; user-select: none; }

    #log { margin-top: 12px; padding: 12px; background: #f1f5f9; border-radius: 6px; }

  </style>

</head>

<body>

  <div id="mousedown-area">Click: left, middle, or right button</div>

  <div id="log">Press a mouse button in the box.</div>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("#mousedown-area").on("mousedown", function (event) {

      event.preventDefault();

      $("#log").html(event.type + ": " + event.which);

    });

    $("#mousedown-area").on("contextmenu", function (e) { e.preventDefault(); });

  </script>

</body>

</html>

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jQuery event.which — official mousedown demo (Try It)