Validasi Textarea secara realtime dengan javascript


<html>
<head>
<title>JS</title>
<script>
window.onbeforeunload = function(){
var ta = document.getElementById("ta").value;
if(ta != ""){
return ("Isi Dulu Dong !");
}
}
</script>
</head>
<body>
<textarea id="ta"></textarea>

</body>
</html>

hasilnya sebagai berikut :

fb

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