<!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>JQuery</title>
<SCRIPT type="text/javascript" src=">
<style type="text/css">
ul,li{margin:0;padding:0}
#scrollDiv{width:300px;height:100px;min-height:25px;line-height:25px;border:#ccc 1px solid;overflow:hidden}
#scrollDiv li{height:25px;padding-left:10px;}
</style>
</head>
<body>
<p>多行滚动演示：</p>
<div id="scrollDiv">
<ul>
<li>这是公告标题的第一行</li>
<li>这是公告标题的第二行</li>
<li>这是公告标题的第三行</li>
<li>这是公告标题的第四行</li>
<li>这是公告标题的第五行</li>
<li>这是公告标题的第六行</li>
<li>这是公告标题的第七行</li>
<li>这是公告标题的第八行</li>
</ul>
</div>
<span id="btn1">down</span>
<br/>
<span id="btn2">up</span>
<script type="text/javascript">
(function($){
$.fn.extend({
Scroll:function(opt,callback){
//参数初始化
if(!opt) var opt={};
var _btnUp = $("#"+ opt.up);//Shawphy:向上按钮
var _btnDown = $("#"+ opt.down);//Shawphy:向下按钮
var timerID;
var _this=this.eq(0).find("ul:first");
var lineH=_this.find("li:first").height(), //获取行高
line=opt.line?parseInt(opt.line,10):parseInt(this.height()/lineH,10), //每次滚动的行数，默认为一屏，即父容器高度
speed=opt.speed?parseInt(opt.speed,10):500; //卷动速度，数值越大，速度越慢（毫秒）
timer=opt.timer //?parseInt(opt.timer,10):3000; //滚动的时间间隔（毫秒）
if(line==0) line=1;
var upHeight=0-line*lineH;
//滚动函数
var scrollUp=function(){
_btnUp.unbind("click",scrollUp); //Shawphy:取消向上按钮的函数绑定
_this.animate({
marginTop:upHeight
},speed,function(){
for(i=1;i<=line;i++){
_this.find("li:first").appendTo(_this);
}
_this.css({marginTop:0});
_btnUp.bind("click",scrollUp); //Shawphy:绑定向上按钮的点击事件
});
}
//Shawphy:向下翻页函数
var scrollDown=function(){
_btnDown.unbind("click",scrollDown);
for(i=1;i<=line;i++){
_this.find("li:last").show().prependTo(_this);
}
_this.css({marginTop:upHeight});
_this.animate({
marginTop:0
},speed,function(){
_btnDown.bind("click",scrollDown);
});
}
//Shawphy:自动播放
var autoPlay = function(){
if(timer)timerID = window.setInterval(scrollUp,timer);
};
var autoStop = function(){
if(timer)window.clearInterval(timerID);
};
//鼠标事件绑定
_this.hover(autoStop,autoPlay).mouseout();
_btnUp.css("cursor","pointer").click( scrollUp ).hover(autoStop,autoPlay);//Shawphy:向上向下鼠标事件绑定
_btnDown.css("cursor","pointer").click( scrollDown ).hover(autoStop,autoPlay);
}
})
})(jQuery);
$(document).ready(function(){
$("#scrollDiv").Scroll({line:4,speed:500,timer:3000,up:"btn1",down:"btn2"});
});
</script>
<p id="p"><span id="p1" class="update">gdgdg</span>gfgd</p>
</body>
</html>