javascript列表框操作函数集合汇总

<script language="javascript">    /* 列表框互相操作函数集 */
  //描述: 添加不重复列表框元素
  function selAdd( srcList, dstList )
  {
      var selectedIndex = new Array();
      var count = 0;
      for ( i=0; i<srcList.options.length; i++ ){
         if ( srcList.options[i].selected ){
             selectedIndex[count] = i;
             count ++;
         }
     }                    
     for ( j=0; j<selectedIndex.length; j++ ){
         k = selectedIndex[j];
         if ( chkDup( srcList.options[k].value, dstList )==false ){
       &, nbsp;   dstList.options.length++;
             var len = dstList.options.length-1;
             dstList.options[len].value = srcList.options[k].value;
             dstList.options[len].text = srcList.options[k].text;
         }
     }
 }
 //描述: 删除列表框元素
 function selDel( list )
 {
     var len = list.options.length;
     var idx = 0;
     while ( idx< len ){
         if ( list.options[idx].selected ){
             list.options.remove(idx);
             len = list.options.length;
         }
         else{
             idx ++;
         }
     }
 }
 //描述: 检测列表框元素重复
 function chkDup( item, list )
 {
     for ( i=0; i<list.options.length; i++ ){
         //alert( item + " - " + list.options[i].value );
         if ( item == list.options[i].value ){
             return true;
         }
     }                    
     return false;
 }
 //描述: 选择列表框的全部成员
 function selSel( list, item )
 {
     item.value = " ";
     for ( i=0; i<list.options.length; i++ ){
         list.options[i].selected=true;
         item.value += list.options[i].value + " ";
     }
 }
 function selSelSingle( list, value )
 {
     for ( i=0; i<list.options.length; i++ ){
         if ( list.options[i].value == value ){
             list.options[i].selected=true;
             break;
         }
     }
 }
 //描述: 根据数组初始化列表框
 function selList( item, arr )
 {
     var curIndex, insIndex, val, text;
     var arrItem = new Array();
     if ( item ){
         item.length = 0;
         curIndex = 0;
        for ( i=0; i<arr.length; i++ ){
             item.length ++;
            insIndex = item.length - 1;
            if ( arr[i] ){
                arrItem = arr[i].split( ", " );
                text = arrItem[1];
                val  = arrItem[0];
                item.options[ insIndex ].text = text;    
                item.options[ insIndex ].value= val;
            }
        }
    }
} 
    </script>