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<html lang="en">

<head>

  <meta charset="utf-8">

  <title>disable() before fire</title>

</head>

<body>

  <h1>Disable before fire()</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("Callback 1"); });

      callbacks.add(function () { lines.push("Callback 2"); });



      callbacks.disable();

      callbacks.fire();



      document.getElementById("out").textContent =

        lines.length ? lines.join("\n") : "(no output — list disabled)";

    })();

  </script>

</body>

</html>

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jQuery callbacks.disable() — before fire (Try It)