滚动经典最新话题[prototype框架]下编写- Javascript

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Javascript 中的滚动经典最新话题[prototype框架]下编写

出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-09-12 浏览: 274 ::

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图片预载入一个对于Array的简单扩展

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。

复制代码代码如下:

<!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> 

图片预载入一个对于Array的简单扩展

Javascript 中的 滚动经典最新话题[prototype框架]下编写

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Javascript 中的滚动经典最新话题[prototype框架]下编写