javaScript 统制textArea输入字数
日期：2014-05-16 浏览次数：20402 次
<!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>无标题文档</title>
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
maxLen = 130; // max number of characters allowed
function checkMaxInput(form) {
if (form.message.value.length > maxLen) // if too long.... trim it!
form.message.value = form.message.value.substring(0, maxLen);
// otherwise, update 'characters left' counter
else form.remLen.value = maxLen - form.message.value.length;
}
//? End -->
</script>
</head>
<body>
<form name=myform action="YOUR-SCRIPT.CGI">
<font size="1" face="arial, helvetica, sans-serif"> ( You may enter up to 125 characters. )<br>
<textarea name=message wrap=physical cols=28 rows=4 onKeyDown="checkMaxInput(this.form)" onKeyUp="checkMaxInput(this.form)"></textarea>
<br>
<input readonly type=text name=remLen size=3 maxlength=3 value="130"> characters left</font>
</form>
</body>
</html>
