Ważna uwaga, wg. https://developer.mozilla.org/en-US/docs/Web/API/Document/keypress_event keypress event zostaje porzucony i nie będzie dalej wspierany, więc mimo, że może on działać jeszcze w chwili obecnej, lepiej go nie używać.
Poniżej przykład wypisywania kodu i znaku klawiszy:
<!DOCTYPE html>
<html lang="pl">
<head>
<meta charset="UTF-8">
<title>Page Title</title>
<meta name="viewport" content="width=device-width,initial-scale=1">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="container">
<div class="row">
<input id="inp">
<p id="printArea"></p>
</div>
</div>
<script type="text/javascript" src="main.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-gtEjrD/SeCtmISkJkNUaaKMoLD0//ElJ19smozuHV6z3Iehds+3Ulb9Bn9Plx0x4" crossorigin="anonymous"></script>
</body>
</html>function init(){
document.getElementById("inp").addEventListener("keydown", logKey);
}
function logKey(event){
printArea.setAttribute('style', 'white-space: pre-line;');
printArea.textContent += "event.which:" + event.which; // numer
printArea.textContent += " event.key:" + event.key; // znak
printArea.textContent += " event.code:" + event.code; // kod klawisza
printArea.textContent += '\r\n';
}
document.addEventListener("DOMContentLoaded",init,false);