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character-count-in-textarea-using-jquery.html
<!DOCTYPE html>
<html>
<head>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<meta charset="utf-8">
<title>Limit character input in the textarea including count</title>
<style type="text/css">
textarea {
display:block;
margin:1em 0;
}
</style>
</head>
<body>
<form>
<label>Maximum 50 characters</label>
<textarea id="textarea" maxlength="50"></textarea>
<span id="rchars">50</span> Character(s) Remaining
</form>
</body>
<script>
var maxLength = 50;
$('textarea').keyup(function() {
var textlen = maxLength - $(this).val().length;
$('#rchars').text(textlen);
});
</script>
</html>