JS.Events.HanglingKeyboardEvents
window.onkeyup = processKeyUp;
window.onkeydown = processKeyDown;
/* or we could have written:
window.addEventListener('keyup', processKeyUp);
window.addEventListener('keydown', processKeyDown);
*/
function processKeyUp(evt) {
var keys = document.querySelector('#keys');
keys.innerHTML += "keyup: " + evt.key + " code: " + evt.keyCode + "<br>";
}
function processKeyDown(evt) {
var keys = document.querySelector('#keys');
keys.innerHTML += "keydown: " + evt.key + " code: " + evt.keyCode + "<br>";
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Example of the 'keyup' and 'keydown' events on the window object</title>
</head>
<body>
<p>Please type some keys and see what happens</p>
<div id="keys"></div>
</body>
</html>