JQuery - OnKeyUp
HTML
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("input").keyup(function(){
$('p').text($('input').val());
});
});
</script>
</head>
<body>
Enter your name: <input type="text">
<p></p>
</body>
</html>