Ajax标签导航效果(仿网易首页)

<!--
function getObject(objectId) {
if(document.getElementById && document.getElementById(objectId)) {
// W3C DOM
return document.getElementById(objectId);
}
else if (document.all && document.all(objectId)) {
// MSIE 4 DOM
return document.all(objectId);
}
else if (document.layers && document.layers[objectId]) {
// NN 4 DOM.. note: this won't find nested layers
return document.layers[objectId];
}
else {
return false;
}
}

var responsecont;
var xmlHttp;
var requestType;
var newsstring;
var ajccache=new Object();//缓存已访问的数据页面
var url;
var MouseDelayTime=150;//鼠标感应延迟
var waitInterval;

function CreateXMLHttpRequest(){
// Initialize Mozilla XMLHttpRequest object
if (window.XMLHttpRequest){
xmlHttp = new XMLHttpRequest();
}
// Initialize for IE/Windows ActiveX version
else if (window.ActiveXObject) {
try{
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP.3.0");
}
catch (e){
try{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e){newsstring = "<div>Loading rquest content fail, Please try it again latter...</div>";}
}
}
}

function getnews(tagid,x){
url = "tab/"+tagid+'_'+x+'.html';
// var loadstatustext="<div><img src='images/loading.gif' /> Loading request content, please wait...</div>";
requestType = tagid;


if(ajccache[url]==null){
CreateXMLHttpRequest();

// getObject(requestType+'_cnt').innerHTML = loadstatustext;
xmlHttp.onreadystatechange = processRequestChange;
xmlHttp.open("GET", url, true);
xmlHttp.setRequestHeader("If-Modified-Since","0");
xmlHttp.send(null);
}
else
{ shownews(requestType,ajccache[url]); }
}

function processRequestChange(){
// only if xmlHttp shows "complete"
if (xmlHttp.readyState == 4){
// only http 200 to process
if (window.location.href.indexOf("http")==-1 || xmlHttp.status == 200){
newsstring = xmlHttp.responseText;
//inject centent to tab-pane
shownews(requestType,newsstring);
ajccache[url]=newsstring; //把已访问的数据缓存下来
}
}
}

function shownews(requestType,newsstring){
//<![CDATA[
responsecont = getObject(requestType+'_cnt');
responsecont.innerHTML = newsstring;
//]]>
}

function TabNews(tagid,x){
for (var i=1;i<=7;i+=2) {
if (i == x) {
getObject(tagid+i).className="tabactive"+i;
if(i!=1){
getObject(tagid+(i-1)).style.display="none";
if(i!=7){
getObject(tagid+(i+1)).style.display="none";
}
}
if(i==1){
getObject(tagid+"2").style.display="none";
}
try{
getnews(tagid,i);
}
catch(e){
alert(e);
}
}
else
{
getObject(tagid+i).className="";
if(i!=7){
getObject(tagid+(i+1)).style.display="block";
}
}
}
}

var idn;

function aet(objid,tagid,etp){ //为LI加上事件 objid：容器ID tagid：组别 etp：触发类型 0-onmouseover 1-onclick
var iif=0;
var lis=objid.getElementsByTagName('li');
requestType=tagid;
url = "tab/"+requestType+"_1.html";
ajccache[url]=getObject(requestType+'_cnt').innerHTML;
for(var iy=0;iy<lis.length;iy++){
if(iif==0){
iif=1;
with(lis[iy]){
if(etp==0){
lis[iy].onmouseover=function(){
if(this.status=="active") return;
requestType=attributes.getNamedItem('id').value.substring(0, attributes.getNamedItem('id').value.length-1);
idn=parseInt(attributes.getNamedItem('id').value.substring(attributes.getNamedItem('id').value.length-1, attributes.getNamedItem('id').value.length));
clearTimeout(waitInterval);
waitInterval=window.setTimeout("TabNews(requestType,idn);",MouseDelayTime);
}
lis[iy].onmouseout=function(){if(this.status=="active") return;clearTimeout(waitInterval);}
}
if(etp==1){
lis[iy].onmouseover=function(){}
lis[iy].onclick=function(){
if(this.status=="active") return;
requestType=attributes.getNamedItem('id').value.substring(0, attributes.getNamedItem('id').value.length-1);
idn=parseInt(attributes.getNamedItem('id').value.substring(attributes.getNamedItem('id').value.length-1, attributes.getNamedItem('id').value.length));
var loadstatustext="<div><img src='images/loading.gif' /> Loading request content, please wait...</div>";
getObject(requestType+'_cnt').innerHTML = loadstatustext;
TabNews(requestType,idn);
}}}}
else{iif=0;}
}
}


function ata(objid){ //一个无关的函数，为解决一个链接问题
var as=objid.getElementsByTagName('a');
for(var i=0;i<as.length;i++){
as[i].pathname="/showfile.html";
}

}
//-->