科讯商业版中用到的ajax空间与分页函数_javascript技巧

 科讯sql商业版中用到的ajax空间与分页函数,他们的js代码学习是非常不错的
//ajax 控件
function PageAjax(){
var xhrObj=null;
if(window.XMLHttpRequest)
{
xhrObj=new XMLHttpRequest();
}
else if(window.ActiveXObject)
{
try{
xhrObj=new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e1)
{
try{
xhrObj=new ActiveXObject("MSXML2.XMLHTTP");
}
catch(e2){
try{
xhrObj=new ActiveXObject("MSXML3.XMLHTTP");
}
catch(e3){
alert("创建Ajax失败："+e3)
}
}
}
}
else
{
alert("未能识别的浏览器");
}
return xhrObj;
}

function Page(curPage,labelid,classid,installdir,url,refreshtype,specialid)
{
this.labelid=labelid;
this.classid=classid;
this.url=url;
if (labelid.substring(0,5)=="{SQL_")
{
var slabelid=labelid.split('(')[0];
slabelid=slabelid.replace("{","");
this.c_obj="c_"+slabelid;
this.p_obj="p_"+slabelid;
}
else
{
this.c_obj="c_"+labelid;
this.p_obj="p_"+labelid;
}
this.installdir=installdir;
this.refreshtype=refreshtype;
this.specialid=specialid;
this.page=curPage;
loadData(1);
}
function loadData(p)
{ this.page=p;
var xhr=new PageAjax();
xhr.open("get",installdir+url+"?labelid="+escape(labelid)+"&classid="+classid+"&refreshtype="+refreshtype+"&specialid=" +specialid+"&curpage="+p,true);
xhr.onreadystatechange=function (){
if(xhr.readyState==1)
{
if (p==1)
eval('document.all.'+c_obj).innerHTML="正在连接服务器...";
}
else if(xhr.readyState==2 || xhr.readyState==3)
{
if (p==1)
eval('document.all.'+c_obj).innerHTML="正在读取数据...";
}
else if(xhr.readyState==4)
{
if (xhr.status==200)
{
var pagearr=xhr.responseText.split("{ks:page}")
var pageparamarr=pagearr[1].split("|");
count=pageparamarr[0];
perpagenum=pageparamarr[1];
pagecount=pageparamarr[2];
itemunit=pageparamarr[3];
itemname=pageparamarr[4];
pagestyle=pageparamarr[5];
getObject(c_obj).innerHTML=pagearr[0];
pagelist();
}
}
}
xhr.send(null);
}
function getObject(id)
{
if(document.getElementById)
{
return document.getElementById(id);
}
else if(document.all)
{
return document.all[id];
}
else if(document.layers)
{
return document.layers[id];
}
}

function pagelist()
{
var n=1;
var statushtml=null;
switch(parseInt(this.pagestyle))
{
case 1:
statushtml="共"+this.count+this.itemunit+" 首页 上一页 下一页 尾页 页次:"+this.page+"/"+this.pagecount+"页 "+this.perpagenum+this.itemunit+this.itemname+"/页";
break;
case 2:
statushtml=""+this.pagecount+"页/"+this.count+this.itemunit+" 9 7 ";
var startpage=1;
if (this.page==10)
startpage=2;
else if(this.page>10)
startpage=eval((parseInt(this.page/10)-1)*10+parseInt((this.page)%10)+2);
for(var i=startpage;i<=this.pagecount;i++){
if (i==this.page)
statushtml+=""+i+" "
else
statushtml+=""+i+" "
n=n+1;
if (n>10) break;
}
statushtml+="8 :";
statushtml=""+statushtml+"";
break;
case 4:
statushtml="共"+this.pagecount+"页/"+this.count+this.itemunit+this.itemname+" 9 7 ";
for(var i=this.page;i<=this.pagecount;i++){
if (i==this.page)
statushtml+=""+i+" "
else
statushtml+="["+i+"] "
n=n+1;
if (n>10) break;
}
statushtml+="8 :";
break;
case 3:
statushtml="第"+this.page+"页 共"+this.pagecount+"页 << < > >> "+this.perpagenum+this.itemunit+this.itemname+"/页";
break;
}
statushtml+=" 第";
for(var i=1;i<=this.pagecount;i++){
if (i==this.page)
statushtml+=""+i+"";
else
statushtml+=""+i+"";
}
statushtml+="页";
getObject(this.p_obj).innerHTML=statushtml;
}
function homePage()
{
if(this.page==1)
alert("已经是首页了！")
else
loadData(1);
}
function lastPage()
{
if(this.page==this.pagecount)
alert("已经是最后一页了！")
else
loadData(this.pagecount);
}
function previousPage()
{
if (this.page>1)
loadData(this.page-1);
else
alert("已经是第一页了");
}

function nextPage()
{
if(this.page loadData(this.page+1);
else
alert("已经到最后一页了");
}
function turn(i)
{
loadData(i);
}