HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>Escape which 27</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }

    button { padding: 8px 16px; }

    #panel { display: none; margin-top: 12px; padding: 16px; background: #e0f2fe; border-radius: 8px; border: 2px solid #0284c7; }

    #log { margin-top: 12px; padding: 12px; background: #f1f5f9; border-radius: 6px; }

  </style>

</head>

<body>

  <button type="button" id="open">Open panel</button>

  <div id="panel">Panel is open — press Escape to close.</div>

  <div id="log">Click Open panel, then press Escape.</div>

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

  <script>

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

      $("#panel").show();

      $("#log").text("Panel open — press Escape.");

    });

    $(document).on("keydown", function (event) {

      if (event.which === 27 && $("#panel").is(":visible")) {

        $("#panel").hide();

        $("#log").text("Panel closed (Escape / which 27)");

      }

    });

  </script>

</body>

</html>

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jQuery event.which — Escape close panel (Try It)