js字数限制提示

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转自：http://www.veryhuo.com/a/view/18234.html

<!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=GBK" />
<title>artTxtCount demo by liehuo.net</title>
<script type="text/javascript" src="http://www.veryhuo.com/uploads/common/js/jquery-1.4.2.min.js"></script>
<script type="text/javascript">
/* tangbin - http://www.veryhuo.com - MIT Licensed */
(function($){
// tipWrap: 	提示消息的容器
// maxNumber: 	最大输入字符
$.fn.artTxtCount = function(tipWrap, maxNumber){
var countClass = 'js_txtCount',		// 定义内部容器的CSS类名
fullClass = 'js_txtFull',		// 定义超出字符的CSS类名
disabledClass = 'disabled';		// 定义不可用提交按钮CSS类名
// 统计字数
var count = function(){
var btn = $(this).closest('form').find(':submit'),
val = $(this).val().length,
// 是否禁用提交按钮
disabled = {
on: function(){
btn.removeAttr('disabled').removeClass(disabledClass);
},
off: function(){
btn.attr('disabled', 'disabled').addClass(disabledClass);
}
};
if (val == 0) disabled.off();
if(val <= maxNumber){
if (val > 0) disabled.on();
tipWrap.html('<span class="' + countClass + '">\u8FD8\u80FD\u8F93\u5165 <strong>' + (maxNumber - val) + '</strong> \u4E2A\u5B57</span>');
}else{
disabled.off();
tipWrap.html('<span class="' + countClass + ' ' + fullClass + '">\u5DF2\u7ECF\u8D85\u51FA <strong>' + (val - maxNumber) + '</strong> \u4E2A\u5B57</span>');
};
};
$(this).bind('keyup change', count);
return this;
};
})(jQuery);
</script>
<script type="text/javascript">
// demo
jQuery(function(){
// 批量
$('.autoTxtCount').each(function(){
$(this).find('.text').artTxtCount($(this).find('.tips'), 140);
});
// 单个
$('#test').artTxtCount($('#test_tips'), 10);
});
</script>
<style>
/* demo */
body { font-size:75%; font-family:'微软雅黑'; }
#demo { width:500px; }
#demo .help, #demo .help a { color:#999; }
#demo form { margin:20px 0; padding:8px; background:#F4F4F4; border:1px solid #EDEDED; }
#demo .tips { color:#999; padding:0 5px; }
#demo .tips strong { color:#1E9300; }
#demo .tips .js_txtFull strong { color:#F00; }
#demo textarea.text { width:474px; }
</style>
</head>
<body>
<div id="demo">
<h1>artTxtCount - 轻量级输入字数提示插件</h1>
<p class="help">$('#text').artTxtCount($('#text_tips'), 10);</p>
<p class="help">by tangbin. <a href="http://www.veryhuo.com" target="_blank" title="planeArt">www.veryhuo.com</a></p>
<form class="autoTxtCount" action="" method="get">
<div>
<textarea class="text" name="" cols="50" rows="3"></textarea>
</div>
<div>
<button type="submit">提交</button>
<span class="tips"></span> </div>
</form>
<form class="autoTxtCount" action="" method="get">
<div>
<textarea class="text" name="" cols="50" rows="3"></textarea>
</div>
<div>
<button type="submit">提交</button>
<span class="tips"></span> </div>
</form>
<form action="" method="get">
<input class="text" id="test" name="" type="text" />
<span id="test_tips" class="tips"></span><br />
<button type="submit">提交</button>
</form>
</div>
</body>
</html><br /><center>如不能显示效果，请按Ctrl+F5刷新本页，更多网页代码：<a href='http://www.veryhuo.com/' target='_blank'>http://www.veryhuo.com/</a></center>

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