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js自动提示效果

 
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<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>js自动提示效果</title>
</head>
<script language="javascript">
var intIndex=0;arrList = new Array();

//将初始化的列表转换成数组
function dearray(str)//定义array
{
arrList = str.split(",");
intIndex = arrList.length;
}

//初始化下拉列表项
function begin()
{
init();
var str="邢晓璐,邢晓红";
dearray(str);

downList(arrList,"wd");
}

function init()
{
if(arrList.constructor!=Array)
{
  alert("downList初始化失败:第一个参数非数组!");
  return;
}

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;
});
}

function downList(arrList,objInputId)
{
var objouter=document.getElementById("keysList"); //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("downList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;

//判断按下的安键
function checkKeyCode(evt)
{
  evt = evt || window.event;
  var keyCode = window.event ? evt.keyCode : evt.which;
  //var keyCode = String.fromCharCode(key);
  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(evt);
  }
  divPosition(evt);
}

function checkAndShow(evt)
{
  var strInput = objInput.value;
  if (strInput!="")
  {
   divPosition(evt);
   selectedIndex=-1;
   objouter.innerHTML ="";
  
   for (intTmp=0;intTmp<arrList.length;intTmp++)
   {
    if (arrList[intTmp].substr(0, strInput.length)==strInput)
    {
     addOption(arrList[intTmp]);
    }
   }
   objouter.style.display="";
  }
  else
  {
   objouter.style.display="none";
  }

  //想下拉列表里添加匹配项
  function addOption(value)
  {
   objouter.innerHTML +="<div onmouseover=this.className=\"sman_selectedStyle\";document.getElementById(\""+objInputId+"\").value=\"" + value + "\" onmouseout=this.className=\"\" onmousedown=document.getElementById(\""+objInputId+"\").value=\"" + value + "\">" + value + "</div>"
  }

}//end checkAndShow()

function chageSelection(isUp)
{
  if (objouter.style.display=="none")
  {
   objouter.style.display="";
  }
  else
  {
   if (isUp)
    selectedIndex++;
   else
    selectedIndex--;
  }
 
  var maxIndex = objouter.childNodes.length-1;
  if (selectedIndex<0){selectedIndex=0;}
  if (selectedIndex>maxIndex) {selectedIndex=maxIndex;}
  for (intTmp=0;intTmp<=maxIndex;intTmp++)
  {
   if (intTmp==selectedIndex)
   {
    objouter.childNodes[intTmp].className="sman_selectedStyle";
    //当上下键移动时,将选中的文本写到文本框中
    document.getElementById(objInputId).value=objouter.childNodes[intTmp].innerHTML;
   }
   else
   {
    objouter.childNodes[intTmp].className="";
   }
  }
}

function outSelection(Index)
{
  objInput.value = objouter.childNodes[Index].innerHTML;
  objouter.style.display="none";
}

//显示下拉列表项
function divPosition(evt)
{
  var e = objInput;
  var ie = (document.all)? true:false
  //定义列表区在不同浏览器中的位置
  if (ie)
  {
   var top = 0;
   var left = -2;
  }
  else
  {
   var top = 2;
   var left = 0;
  }
  
  while (e.offsetParent)
  {
   left += e.offsetLeft + (e.currentStyle?(parseInt(e.currentStyle.borderLeftWidth)).NaN0():0);
   top += e.offsetTop + (e.currentStyle?(parseInt(e.currentStyle.borderTopWidth)).NaN0():0);
   e = e.offsetParent;
  }
 
  left += e.offsetLeft + (e.currentStyle?(parseInt(e.currentStyle.borderLeftWidth)).NaN0():0);
  top += e.offsetTop + (e.currentStyle?(parseInt(e.currentStyle.borderTopWidth)).NaN0():0);
  objouter.style.top = (top + objInput.clientHeight) + "px";
  objouter.style.left = left + "px";
  objouter.style.width= objInput.clientWidth+1 + "px";
}

}//end downList()


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;
}

Number.prototype.NaN0 = function()
{
return isNaN(this)?0:this;
}

//出现光标
document.write("<div id=\"keysList\" style=\"position:absolute;display:none;background:#FFFFFF;border: 1px solid #CCCCCC;font-size:14px;cursor: default;\" onblur> </div>");
document.write("<style>.sman_selectedStyle{background-Color:#102681;color:#FFFFFF}</style>");
</script>

<body onLoad="begin()">
<form name="search" action="" method="get">
<input autocomplete="off" type="text" id="wd" name="wd">
</form>
</body>
</html>
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