输入框字数控制 

<!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></title>
</head>

<body>



    <input type="text" onkeyup="checkLength(this);"/><span id="words" style="color:Red;">200</span>
    <input type="text" onkeyup="checkLength(this);"/><span id="wordss" style="color:Red;">200</span>
    <input type="text" onkeyup="checkLen(this);"/><span id="word" style="color:Red;">50</span>
<script type="text/javascript">
function checkLength(words) {
	var maxChars = 200; //
	if(words.value.length > maxChars){
		alert("您出入的字数超多限制!");
		// 超过限制的字数了就将 文本框中的内容按规定的字数 截取
		words.value = words.value.substring(0,maxChars);
		return false;
	}else{
		var curr = maxChars - words.value.length; 
		document.getElementById("words").innerHTML = curr.toString();
		document.getElementById("wordss").innerHTML = curr.toString();
		return true;
	}
}

function checkLen(words) {
	var minChars = 50; //
	if(words.value.length > minChars){
		alert("您出入的字数超多限制!");
		// 超过限制的字数了就将 文本框中的内容按规定的字数 截取
		words.value = words.value.substring(0,minChars);
		return false;
	}else{
		var curr = minChars - words.value.length; 
		document.getElementById("word").innerHTML = curr.toString();
		return true;
	}
}
</script>
</body>

</html>

　　

posted @ 2014-11-06 13:53  对方屌丝正在输入中  阅读(440)  评论(0)    收藏  举报