var obj;


var kw="Header1$TextBox_keywords";
var to;//setTimeout时间变量，对于输入快时可以延迟查询
var RequestFile="js/search.aspx";//
var dirPath="";//如果更换过路径，注意路径也要修改
function $(id){return document.getElementById(id);}

function getD(e,va){

  e=e||event;
  if(e.keyCode==38||e.keyCode==40||e.keyCode==13)return;
  if(to) clearTimeout(to);
  to=setTimeout("getData('"+va+"')",500);//延迟500毫秒后再查询
}
function getData(va){
  $('dvContent').style.display="none";
  if(va!=""){
    var url=RequestFile+'?ts='+new Date().getTime()+'&k='+escape(va);

    obj=CreateAJAX();
    if(obj){
      obj.onreadystatechange=handlejs;
      obj.open('get',url,true);
      obj.send(null);
    
    }
    else alert("创建AJAX对象失败！");
  }
}
function handlejs(){
   if(obj.readyState==4){ 
   
   
      if(obj.status==200){               
            xml=obj.responseXML;
            node=xml.getElementsByTagName("data");
           
            if(node.length!=0)
            {//如果d节点的子节点不为0,则取数据            
              var dv=$("dvContent");
              dv.innerHTML=node[0].firstChild.nodeValue;
              dv.style.display="block";
              
	      CurrentIndex=-1;//重新设置焦点项
	     //   alert(node[0].firstChild.nodeValue);
            }
             
      }
      else  alert("请求的文件出错，请检查！");                     
   }   
}
function CreateAJAX(){  
  if(typeof(XMLHttpRequest)!="undefined")return new XMLHttpRequest();
  if(window.ActiveXObject){
     var objs=["MSXML2.XMLHttp.5.0","MSXML2.XMLHttp.4.0","MSXML2.XMLHttp.3.0","MSXML2.XMLHttp","Microsoft.XMLHTTP"];    
     var xmlhttp;
     for(var i=0;i<objs.length;i++){
       try{
         xmlhttp=new ActiveXObject(objs[i]);return xmlhttp;
       }
       catch(e){
         //do nothing
       } 
     }
   }  
}
function setContent(data,IsKey){
  $(kw).value=data;
  if(!IsKey){
    $('dvContent').style.display="none";
    CurrentIndex=-1;
  }
}
function setPosition(){
  var dv=$('dvContent');
  dv.style.left=getPos("x");

  dv.style.top=getPos("y")+$(kw).offsetHeight+1;
 
 // dv.style.width=$(kw).offsetWidth;
 // dv.style.width=$(kw).Width;
 
 
 
}
function getPos(type){
  var p;
  var o=$(kw);
  if(type=="x")p=o.offsetLeft;
  else p=o.offsetTop;
  while(o=o.offsetParent){
    if (type=="x") p+=o.offsetLeft; 
    else p+=o.offsetTop;
  }
  return p;
}
var CurrentIndex=-1;
document.onkeydown=function(e){
  e=e||event;
  var DC=$("dvContent");
  if(DC.style.display=="none")return;//不显示时不响应按键
  var items=DC.getElementsByTagName("div");
  var itemLength=items.length;
  if(itemLength<1) return;//没有匹配的内容时不响应按键

  if(items[CurrentIndex])items[CurrentIndex].className="unfocus";
  if(e.keyCode==38){//上  
    if(CurrentIndex==-1) CurrentIndex=0;
    else CurrentIndex--;
    if(CurrentIndex<0)  CurrentIndex=itemLength-1;    
  }
  else if(e.keyCode==40){//下  
    if(CurrentIndex==-1) CurrentIndex=0;
    else CurrentIndex++;
    if(CurrentIndex>itemLength-1)CurrentIndex=0;  
  }
  else if(e.keyCode==13)
  {
  setContent(items[CurrentIndex].innerHTML);
  event.keyCode=9;
  }
  if(CurrentIndex!=-1){
     items[CurrentIndex].className="focus";
     setContent(items[CurrentIndex].innerHTML,true);
  }
}