how to handle keyDown and keyUp event in JQ?

1 votes
57 views
Ethan Karla asked 28-Jul-2021 in Web Application by Ethan Karla

how to handle keyDown and keyUp event in JQ?    

1 Answer

1 votes
Ravi Vishwakarma answered 03-Aug-2021 by Ravi Vishwakarma

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

how to handle keyDown and keyUp event in JQ?