JavaScript 限制textarea的输入长度（IE浏览器，Firefox，Chrome）

只看该作者 · 发表于 2009-12-11 11:08:55

复制以下的代码，放进您的html，即可使用

<!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" lang="gb2312">
<head>
<head>
<title> Code：用JavaScript限制textarea输入长度 (For: IE、Firefox ...)</title>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<meta name="author" content="枫岩,CNLei.y.l@gmail.com">
<meta name="keywords" content="textarea,输入长度" />
<meta name="description" content="用JavaScript限制textarea输入长度 (For: IE、Firefox ...)" />
<style type="text/css" media="all">
body {font-size:14px;}
</style>
</head>
<body>
maxlength=10
<textarea maxlength="10" onkeyup="return isMaxLen(this)"></textarea>
maxlength=255
<textarea maxlength="255" onkeyup="return isMaxLen(this)" onkeydown="return isMaxLen(this)" onchange="return isMaxLen(this)"></textarea>
<script type="text/javascript">
function isMaxLen(o){
var nMaxLen=o.getAttribute? parseInt(o.getAttribute("maxlength")):"";
if(o.getAttribute && o.value.length>nMaxLen){
o.value=o.value.substring(0,nMaxLen);
alert("The maximum number of characters allowed is 255.");
}
}
</script>
</body>
</html>

复制代码

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