前天见到sin100看到的那个日本网站的滚动，挖掘后原来是使用Ajax读取xml后显示出来的。
就弄了这个滚动经典最新话题的供朋友参考参考。
范例使用了prototype.js的ajax轻便型框架。
因为远程调用了 prototype.js 这个文件，测试的朋友请耐心等候一下下。
经典不允许远程调用别的站点的js文件，所以还请多一部操作，复制到本地运行查看结果。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="gb2312" >
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<meta name="author" content="Smiling Dolphin" />
<meta name="keywords" content="design, css, cascading, style, sheets, xhtml, graphic design, w3c, web standards, visual, display, java, javascript, c++, php, jsp, asp, py, pl" />
<meta name="description" content="my favorites language." />
<meta name="robots" content="all" />
<title>Dolphin Document</title>
<style type="text/css" title="currentStyle" media="screen">
#scroll{width:99%;height:25px;border:1px solid #2BBB00;background:#E7FFE0;overflow:hidden;}
#scrollFrame,#scrollFrame2{line-height:25px;font-size:13px; word-break:keep-all;line-break:normal; white-space:nowrap;}
#scrollFrame span,#scrollFrame2 span{display:inline;margin-right:20px;}
</style>
<script src="http://prototype.conio.net/dist/prototype-1.4.0.js" type="text/javascript"></script>
</head>
<body>
<div id="scroll">
<div id="scrollFrame"></div>
<div id="scrollFrame2"></div>
</div>
<script language="javascript" type="text/javascript">
var Ticker = Class.create();
Ticker.prototype = {
initialize: function() {
try{
this.scrollType = "normal";
this.m_scroll = $(arguments[0]);
this.m_scroll_1 = $(arguments[1]);
this.m_scroll_2 = $(arguments[2]);
this.m_speed = (arguments[3][0])?arguments[3][0]:3;
this.m_request = (arguments[3][1])?arguments[3][1]:60;
this.m_loop = (arguments[3][2])?arguments[3][2]:0.05;
this.m_url = (arguments[3][3])?arguments[3][3]:'http://bbs.blueidea.com/rss.php?fid=1';
}catch(e){}
finally{}
Event.observe(this.m_scroll, 'mouseover', this.mouseover.bindAsEventListener(this), false);
Event.observe(this.m_scroll, 'mouseout', this.mouseout.bindAsEventListener(this), false);
new PeriodicalExecuter(this.scroll.bindAsEventListener(this), this.m_loop);
new PeriodicalExecuter(this.load.bindAsEventListener(this), this.m_request);
this.load();
},
load:function(){
var request = new Ajax.Request(
this.m_url,
{
method: 'post',
onSuccess: this.update.bindAsEventListener(this),
onFailure: false,
on304: false
}
);
},
update:function(request){
var items = request.responseXML.getElementsByTagName("item");
for(var i=0;i<items.length;i++){
var title = items[i].childNodes[0].childNodes[0].nodeValue;
var link = items[i].childNodes[1].childNodes[0].nodeValue;
var description = items[i].childNodes[2].childNodes[0].nodeValue;
var author = items[i].childNodes[4].childNodes[0].nodeValue;
this.m_scroll_1.innerHTML += "<span><a href=\""+link+"\" title=\""+author+"：\r\n"+description+"\">"+i+"："+title+"</a></span>";
}
this.m_scroll_2.innerHTML = this.m_scroll_1.innerHTML;
},
scroll:function(event){
switch(this.scrollType){
case "slow":
if(this.m_scroll_2.offsetWidth-this.m_scroll.scrollLeft<=0){
this.m_scroll.scrollLeft -= this.m_scroll_1.offsetWidth;
}else{
this.m_scroll.scrollLeft++;
}
break;
case "normal":
default:
if(this.m_scroll_2.offsetWidth-this.m_scroll.scrollLeft<=0){
this.m_scroll.scrollLeft -= this.m_scroll_1.offsetWidth;
}else{
this.m_scroll.scrollLeft+=3;
}
break;
}
},
mouseover:function(){
this.scrollType = 'slow';
return false;
},
mouseout:function(){
this.scrollType = 'normal';
return false;
}
}
ticker1 = new Ticker("scroll","scrollFrame","scrollFrame2",[3,60,0.05,'http://bbs.blueidea.com/rss.php?fid=1']);
</script>
</body>
</html>