HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>hide callback demo</title>

  <style>

    body { font-family: sans-serif; padding: 16px; }

    #book { width: 120px; height: 80px; background: #6366f1; color: #fff; display: flex; align-items: center; justify-content: center; border-radius: 8px; margin: 12px 0; }

    #clickme { color: #6366f1; cursor: pointer; text-decoration: underline; }

  </style>

</head>

<body>

  <div id="clickme">Click here</div>

  <div id="book">Book</div>

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

  <script>

    $("#clickme").on("click", function() {

      $("#book").hide("slow", function() {

        alert("Animation complete.");

      });

    });

  </script>

</body>

</html>

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jQuery .hide() — complete callback (Try It)