Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
i = 0;
$(document).ready(function(){
    $("input").keypress(function(){
        $("span").text(i += 1);
    });
});
</script>
</head>
<body>

Enter your name: <input type="text">

<p>Keypresses: <span>0</span></p>

</body>
</html>