HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>one foo click demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    #foo { padding: 12px 20px; background: #3b82f6; color: #fff; border: none; border-radius: 6px; cursor: pointer; font-size: 1rem; }
    #foo:hover { background: #2563eb; }
    #status { margin-top: 14px; color: #1d4ed8; font-weight: bold; max-width: 360px; }
  </style>
</head>
<body>
  <button type="button" id="foo">Click me (once only)</button>
  <div id="status">First click shows alert. Second click does nothing.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#foo").one("click", function() {
      alert("This will be displayed only once.");
      $("#status").text("Handler removed — further clicks are ignored.");
    });
  </script>
</body>
</html>

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jQuery .one('click') on #foo — one-time alert (Try It)