HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>clearQueue vs stop(true)</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 32rem; }

    #box { width: 40px; height: 40px; background: #0284c7; margin: 12px 0; }

    pre { background: #f1f5f9; padding: 12px; border-radius: 6px; font-size: 13px; white-space: pre-wrap; }

    button { margin-right: 8px; padding: 8px 12px; margin-top: 8px; }

  </style>

</head>

<body>

  <div id="box"></div>

  <button type="button" id="run-stop">Run stop(true)</button>

  <button type="button" id="run-clear">Run clearQueue()</button>

  <pre id="log">Click a button to test.</pre>

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

  <script>

    function setupBox() {

      var $box = $("#box").css({ width: 40 });

      $box.stop(true, true).clearQueue();

      $box.animate({ width: 200 }, 2000);

      $box.queue(function (next) {

        $("#log").append("custom callback queued\n");

        next();

      });

      return $box;

    }

    $("#run-stop").on("click", function () {

      $("#log").text("");

      var $box = setupBox();

      $box.stop(true);

      $("#log").append("after stop(true): fx length = " + $box.queue("fx").length);

    });

    $("#run-clear").on("click", function () {

      $("#log").text("");

      var $box = setupBox();

      $box.clearQueue();

      $("#log").append("after clearQueue: fx length = " + $box.queue("fx").length);

    });

  </script>

</body>

</html>

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jQuery .clearQueue() vs .stop(true) (Try It)