<script language="javascript">
var intIndex=0;arrList = new Array();
arrList[intIndex++] = "1sdfsdf.com";
arrList[intIndex++] = "a11sdafs.net";
arrList[intIndex++] = "b22dsafsdf";
arrList[intIndex++] = "c333asdfsadf";
arrList[intIndex++] = "4444dsafasdf";
arrList[intIndex++] = "dddsfddsafdsaf";
arrList[intIndex++] = "121213dsafsdaf";
arrList[intIndex++] = "43213asdfadsf";
arrList[intIndex++] = "dsa3121dasf3";
arrList[intIndex++] = "a213";
arrList[intIndex++] = "323313";
arrList[intIndex++] = "3213";
arrList[intIndex++] = "32213";
arrList[intIndex++] = "dsfsdddd";
arrList[intIndex++] = "ds11dfsfd";
arrList[intIndex++] = "ffdafd";
arrList[intIndex++] = "afdfd";
arrList[intIndex++] = "afd";
arrList[intIndex++] = "baffad";
arrList[intIndex++] = "2fda2fd";
arrList[intIndex++] = "dasd";

function smanPromptList(arrList,objInputId){
 this.style = "background:#E8F7EB;border: 1px solid #CCCCCC;font-size:14px;cursor: default;"
 if (arrList.constructor!=Array){alert('smanPromptList初始化失败:第一个参数非数组!');return ;}
 window.onload =function() {
                                 arrList.sort(function(a,b){
                                          if(a.length>b.length)return 1;
                                         else if(a.length==b.length)return a.localeCompare(b);
                                         else return -1;
                                })
  var objouter=document.getElementById("__smanDisp") //显示的DIV对象
  var objInput = document.getElementById(objInputId); //文本框对象
  var selectedIndex=-1;
  var intTmp; //循环用的:)
  if (objInput==null) {alert('smanPromptList初始化失败:没有找到"'+objInputId+'"文本框');return ;}
   //文本框失去焦点
   objInput.onblur=function(){
    objouter.style.display='none';
   }
   //文本框按键抬起
   objInput.onkeyup=checkKeyCode;
   //文本框得到焦点
   objInput.onfocus=checkAndShow;
   function checkKeyCode(){
    var ie = (document.all)? true:false
    if (ie){
     var keyCode=event.keyCode
     if (keyCode==40||keyCode==38){ //下上
      var isUp=false
      if(keyCode==40) isUp=true ;
      chageSelection(isUp)
     }else if (keyCode==13){//回车
      outSelection(selectedIndex);
     }else{
      checkAndShow()
     }
    }else{
     checkAndShow()
    }
    divPosition()
   }

   function checkAndShow(){
      var strInput = objInput.value
      if (strInput!=""){
       divPosition();
       selectedIndex=-1;
       objouter.innerHTML ="";
       for (intTmp=0;intTmp<arrList.length;intTmp++){
        if (arrList[intTmp].substr(0, strInput.length).toUpperCase()==strInput.toUpperCase()){
         addOption(arrList[intTmp]);
        }
       }
       objouter.style.display='';
      }else{
       objouter.style.display='none';
     }
     function addOption(value){
      objouter.innerHTML +="<div onmouseover=\"this.className='sman_selectedStyle'\" onmouseout=\"this.className=''\" onmousedown=\"document.getElementById('"+objInputId+"').value='" + value + "'\">" + value + "</div>" 
     }
   }
   function chageSelection(isUp){
    if (objouter.style.display=='none'){
     objouter.style.display='';
    }else{
     if (isUp)
      selectedIndex++
     else
      selectedIndex--
    }
    var maxIndex = objouter.children.length-1;
    if (selectedIndex<0){selectedIndex=0}
    if (selectedIndex>maxIndex) {selectedIndex=maxIndex}
    for (intTmp=0;intTmp<=maxIndex;intTmp++){

     if (intTmp==selectedIndex){
      objouter.children[intTmp].className="sman_selectedStyle";
     }else{
      objouter.children[intTmp].className="";
     }
    }
   }
   function outSelection(Index){
    objInput.value = objouter.children[Index].innerText;
    objouter.style.display='none';
   }
   function divPosition(){
    objouter.style.top =getAbsoluteHeight(objInput)+getAbsoluteTop(objInput);
    objouter.style.left =getAbsoluteLeft(objInput);
    objouter.style.width=getAbsoluteWidth(objInput)
   }
 }
 document.write("<div id='__smanDisp' style='position:absolute;display:none;" + this.style + "' onbulr> </div>");
 document.write("<style>.sman_selectedStyle{background-Color:#102681;color:#FFFFFF}</style>");
 function getAbsoluteHeight(ob){
  return ob.offsetHeight
 }
 function getAbsoluteWidth(ob){
  return ob.offsetWidth
 }
 function getAbsoluteLeft(ob){
  var mendingLeft = ob .offsetLeft;
  while( ob != null && ob.offsetParent != null && ob.offsetParent.tagName != "BODY" ){
   mendingLeft += ob .offsetParent.offsetLeft;
   mendingOb = ob.offsetParent;
  }
  return mendingLeft ;
 }
 function getAbsoluteTop(ob){
  var mendingTop = ob.offsetTop;
  while( ob != null && ob.offsetParent != null && ob.offsetParent.tagName != "BODY" ){
   mendingTop += ob .offsetParent.offsetTop;
   ob = ob .offsetParent;
  }
  return mendingTop ;
 }
}
smanPromptList(arrList,"inputer")
</script>

<input type="text" id="inputer">