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  <meta charset="utf-8">

  <title>fire when locked</title>

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<body>

  <h1>fire() when locked()</h1>

  <pre id="out"></pre>

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

  <script>

    (function () {

      var lines = [];

      var callbacks = $.Callbacks();



      callbacks.add(function () { lines.push("Handler fired"); });

      callbacks.lock();

      lines.push("locked(): " + callbacks.locked());

      callbacks.fire();



      document.getElementById("out").textContent = lines.join("\n");

    })();

  </script>

</body>

</html>

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jQuery callbacks.locked() — fire when locked (Try It)