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How to use onkeypress Event?

Example :

<html>
<head>
<title>Onkeypress Event</title>
<link rel="stylesheet" href="style.css">
<style>
div{background-color:lightgrey;}
</style>
<script>
var i=1;
function key_is_pressed()
{
document.getElementById("mytext").innerHTML="Key is pressed "+i+" time";
i++;
}
</script>
</head>
<body>
<h2>Q8.Onkeypress Event</h2>
<div>
<input type="text" id="txt_num" onkeypress="key_is_pressed()">
<h3 id="mytext"></h3>
</div>
</body>
</html>

Onkeypress Event

Q8.Onkeypress Event