<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Textarea Karakter Sayısı Belirleme</title>
<SCRIPT language=javascript>
function textareaLimiter(field, countfield, maxlimit) {
if (field.value.length > maxlimit) field.value = field.value.substring(0, maxlimit);
else countfield.value = maxlimit - field.value.length;
}
</SCRIPT>
</head>
<body>
<form>
<textarea cols="25" rows="4" name="adres" onkeyup="textareaLimiter(this.form.adres, this.form.remLen, 10);" onkeydown="textareaLimiter(this.form.adres, this.form.remLen, 10);"></textarea>
<input name="remLen" value="10" size="4" maxlength="3" readonly="" >
<br>
<input type="submit" value="Formu Gönder">
</form>
</body>
</html>