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<html lang="en">

<head>

  <meta charset="utf-8">

  <title>locked() before/after</title>

</head>

<body>

  <h1>Before and after lock()</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();



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

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

      callbacks.lock();

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



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

    })();

  </script>

</body>

</html>

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jQuery callbacks.locked() — before/after lock (Try It)