Demo of counting text entered in textarea by using keyup event using JQuery

HTML

<textarea id=d1 rows=3 cols=80 name=d1></textarea>
<div id=d2></div>

jquery

<script>
$(document).ready(function() {
$("#d1").keyup(function(){
var str_length = $("#d1").val().length;
$('#d2').html(str_length);
});
})
</script>