HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>migrate unload to on demo</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 480px; }

    button { padding: 10px 16px; cursor: pointer; border: none; border-radius: 6px; margin: 4px 6px 4px 0; color: #fff; }

    #bind { background: #2563eb; }

    #trigger { background: #6366f1; }

    #off { background: #64748b; }

    #log { margin-top: 12px; padding: 12px; background: #eff6ff; border-radius: 6px; font-size: 14px; }

    .badge { display: inline-block; background: #bbf7d0; padding: 4px 8px; border-radius: 4px; font-size: 12px; margin-bottom: 8px; }

  </style>

</head>

<body>

  <div class="badge">jQuery 3.7 — .on("unload") migration</div>

  <button type="button" id="bind">.on("unload", cleanup)</button>

  <button type="button" id="trigger">.trigger("unload")</button>

  <button type="button" id="off">.off("unload", cleanup)</button>

  <div id="log">Use buttons in order to bind, trigger, and remove.</div>

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

  <script>

    function cleanup() {

      localStorage.setItem("draftSaved", "true");

      $("#log").text("cleanup ran — draftSaved=true in localStorage");

    }

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

      $(window).on("unload", cleanup);

      $("#log").text("Bound with .on('unload', cleanup)");

    });

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

      $(window).trigger("unload");

    });

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

      $(window).off("unload", cleanup);

      $("#log").text("Removed with .off('unload', cleanup)");

    });

  </script>

</body>

</html>

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jQuery .on('unload') — migration (Try It)