when we press a button from keybord, the keydown() event is occure. and this press button release then keyup() event occure.
Syntax$(selector).keydown()
$(selector).keydown(function () {})$(selector).keyup()
$(selector).keyup(function () {})
<!doctype html>
<html lang='en'>
<head>
<!-- Required meta tags -->
<meta charset='utf-8'>
<meta name='viewport' content='width=device-width, initial-scale=1, shrink-to-fit=no'>
<script src='https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js'></script>
<!-- Bootstrap CSS -->
<link href='https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css' rel='stylesheet' integrity='sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC' crossorigin='anonymous'>
<title>Submit Event demo</title>
</head>
<body>
<div class='container'>
<h1 class='text-center mt-5'>keydown and keyup event</h1>
<div class='form-group m-2'>
<input type='text' class='form-control' placeholder='Enter your username'name='email' />
</div>
<p class='alert m-3'></p>
</div>
<script>
$(document).ready(function () {
$(':text').keyup(function () {
$('p').removeClass('alert-success');
$('p').text('key up').addClass('alert-danger');
});
$(':text').keydown(function () {
$('p').removeClass('alert-danger');
$('p').text('key down').addClass('alert-success');
});
});
</script>
<script src='https://code.jquery.com/jquery-3.3.1.slim.min.js' integrity='sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo' crossorigin='anonymous'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js' integrity='sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1' crossorigin='anonymous'></script>
<script src='https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js' integrity='sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM' crossorigin='anonymous'></script>
</body>
</html>
Output
