option的动态添加和选中

  
//==========添加option===============//
  var select=document.getElementById("LIST_ID");
  var surl="system.xmlhttp.XMLHTTP.ak?flag=fillCMPList";
  var datas=getServerData(surl,'');//发送请求
  var rows=datas.split("#");
    for(var i=1;i<rows var columns='rows[i].split(",");'
     select option objselect='document.getElementById("LIST_ID");' for i="0;" if>") {        
            objSelect.options[i].selected = true;        
            break;        
        }        
    } 
 // document.getElementById("LIST_ID").setAttribut("readOnly","true");
  //===================================//

//==========js选中下拉框========================//   
  var objSelect=document.getElementById("USER_ID");   
    for (var i = 0; i < objSelect.options.length; i++) {           
       if (objSelect.options[i].value == "${USER_ID}") {           
           objSelect.options[i].selected = true;           
           break;           
       }           
   }    
 //===================================//  


//   排序：向上移动   
  function   Up(){  
     var   sel=document.getElementById("selectCheck");  //获取select
     var   nIndex   =   sel.selectedIndex;   //需要进行操作的select 项的索引
     var   nLen   =   sel.length;   //select 总共项目数
     if   ((nLen<1)||(nIndex==0))   return;   
     if   (nIndex<0)  {   
        alert("请选择一个要移动的已选按钮！");   
        return;   
      }   
     var   sValue=sel.options[nIndex].value;   
     var   sHTML=sel.options[nIndex].innerHTML;   
     sel.options[nIndex].value=sel.options[nIndex-1].value;   
     sel.options[nIndex].innerHTML=sel.options[nIndex-1].innerHTML;   
     sel.options[nIndex-1].value=sValue;   
     sel.options[nIndex-1].innerHTML=sHTML;   
     sel.selectedIndex=nIndex-1;   
  }  
  //   排序：向下移动   
  function   Down() {   
     var   sel=document.getElementById("selectCheck");   
     var   nIndex   =   sel.selectedIndex;   
     var   nLen   =   sel.length;   
     if   ((nLen<1)||(nIndex==nLen-1))   return;   
     if   (nIndex<0)   {   
       alert("请选择一个要移动的已选按钮！");   
       return;   
     }   
     var   sValue=sel.options[nIndex].value;   
     var   sHTML=sel.options[nIndex].innerHTML;   
     sel.options[nIndex].value=sel.options[nIndex+1].value;   
     sel.options[nIndex].innerHTML=sel.options[nIndex+1].innerHTML;   
     sel.options[nIndex+1].value=sValue;   
     sel.options[nIndex+1].innerHTML=sHTML;   
     sel.selectedIndex=nIndex+1;   
   }    
   //移动到最上
   function UpFirst(){
      var   sel=document.getElementById("selectCheck"); 
      var   nIndex   =   sel.selectedIndex;  
      var   nLen = sel.options.length;
      if   ((nLen<1)||(nIndex==0))   return;   
      
      if(nIndex<0){
          alert("请选择一个要移动的已选按钮！");   
          return; 
      }
      var tempValue = document.getElementById("tempValue");//用于临时存放option的值
      tempValue.value = "";
      for(var k=0;k<nIndex;k++){
         tempValue.value +=  sel.options[k].value+";";
      }
      var arrValue = tempValue.value.split(';');
      var   sValue=sel.options[nIndex].value;   
      var   sHTML=sel.options[nIndex].innerHTML;   
      sel.options[0].value = sValue;
      sel.options[0].innerHTML = sHTML;
    
     for(var j=1;j<=nIndex;j++){
       sel.options[j].value = arrValue[j-1];
       sel.options[j].innerHTML = arrValue[j-1];
     }
      sel.selectedIndex = 0;
   }
   //移动到最后
   function DownLast(){
      var   sel=document.getElementById("selectCheck"); 
      var   nIndex   =   sel.selectedIndex;  
      var   nLen = sel.options.length;
      if   ((nLen<1)||(nIndex==nLen))   return;   
      
      if(nIndex<0){
          alert("请选择一个要移动的已选按钮！");   
          return; 
      }
      var tempValue = document.getElementById("tempValue");//用于临时存放option的值
      tempValue.value = "";
      for(var k=nIndex+1;k<nLen;k++){
         tempValue.value +=  sel.options[k].text+";";
      }
      var arrValue = tempValue.value.split(';');
      var   sValue=sel.options[nIndex].value;   
      var   sHTML=sel.options[nIndex].innerHTML;   
     
    
     for(var j=nIndex;j<nLen;j++){
       sel.options[j].value = arrValue[j-nIndex ];
       sel.options[j].innerHTML = arrValue[j-nIndex];
     }
     
      sel.options[nLen-1].value = sValue;
      sel.options[nLen-1].innerHTML = sHTML;
      sel.selectedIndex = nLen-1;
   }