TextArea Maxlength 길이 제한

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>TextArea Maxlength</title>
</head>
<body>
<script type="text/javascript">
function isMaxlength(obj){
var mlength = obj.getAttribute? parseInt(obj.getAttribute("maxlength")) : "";
if (obj.getAttribute && obj.value.length > mlength)
obj.value = obj.value.substring(0,mlength);
}
</script>
TextAreaの最大値を「20」に設定：<br />
<textarea maxlength="20" cols="40" rows="5" onkeyup="return isMaxlength(this)"></textarea>
</body>
</html>
[출처] [JavaScript] textarea maxlength로 제한하기|작성자 popejoa

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