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滾動經(jīng)典最新話題[prototype框架]下編寫

更新時間：2006年10月03日 00:00:00 作者：

前天見到sin100看到的那個日本網(wǎng)站的滾動，挖掘后原來是使用Ajax讀取xml后顯示出來的。

就弄了這個滾動經(jīng)典最新話題的供朋友參考參考。
范例使用了prototype.js的ajax輕便型框架。
因為遠程調(diào)用了 prototype.js 這個文件，測試的朋友請耐心等候一下下。

經(jīng)典不允許遠程調(diào)用別的站點的js文件，所以還請多一部操作，復(fù)制到本地運行查看結(jié)果。

復(fù)制代碼代碼如下:

<!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> 