HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>unload session cleanup</title>

  <style>

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

    button { padding: 10px 16px; background: #2563eb; color: #fff; border: none; border-radius: 6px; cursor: pointer; margin-right: 8px; }

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

  </style>

</head>

<body>

  <button type="button" id="sim">Simulate unload</button>

  <button type="button" id="read">Read storage</button>

  <div id="log">Bind with eventData, then simulate.</div>

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

  <script>

    $(window).on("unload", { app: "editor" }, function(event) {

      sessionStorage.setItem(event.data.app + ":lastExit", String(Date.now()));

    });

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

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

      $("#log").text("Unload triggered — click Read storage.");

    });

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

      $("#log").text("editor:lastExit = " + sessionStorage.getItem("editor:lastExit"));

    });

  </script>

</body>

</html>

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jQuery unload event — session cleanup (Try It)