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  <meta charset="utf-8">

  <title>fired() with once</title>

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  <h1>once list</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("once");



      callbacks.add(function () { lines.push("Runs once"); });

      callbacks.fire();

      callbacks.fire();

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



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

    })();

  </script>

</body>

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jQuery callbacks.fired() — once list (Try It)