js.列表框 菜鸟问题 列表框焦点

 左右列表框 传值。假如我点了全部向右后。右边的列表框就得到所有左边列表框的值。左边的清空。
 我现在遇到的问题是。当我点了  全部向右后 然后选中右边框中的某项。向下。问题就在这里。假设我选择了右边框中的 短消息一项。点向下按钮 可以实现（该项跳到下面一行）。 我想继续让 短消息这项获得焦点。。无论我如何点短消息如果不是最后一行的话他总是往下跳，一直获得焦点。在我没有选择其他项之前。问题是我现在不知道如何获取焦点。
  请各位大虾。指教了。
下面是我的代码，可以复制运行。。谢谢了<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<script language="javascript">
<!-- 从左到右添加。从右往左添加-->
    function trans(from,to){
   fromList = eval('document.forms[0].'+ from);
   toList = eval('document.forms[0].'+ to);
   if(toList.options.length>0&&toList.options[0].value=="hello"){
           toList.options.length=0;
   }
   for(var i=0;i<fromList.options.length;i++){
      current = fromList.options[i];
  var flag = false;
  if(current.selected){
      flag=true;
  if(current.value=="hello"){
       return ;
  }
  txt=current.text;
  val=current.value;
  toList.options[toList.length]=new  Option(txt,val);
  fromList.options[i] = null;
  i--;
  }
  
   }
}

<!--向上移动 -->
function forword (up){
   high=eval('document.forms[0].'+up);
       for(var i=1;i<high.options.length;i++){
       current = high.options[i];
   yes = high.options[i-1];
   var flag =false;
   if(current.selected){
       flag=true;
   txt1=yes.text;
   var1=yes.value;
   
   txt =current.text;
   val =current.value;
   high.options[i] =new Option(txt1,var1);
   high.options[i-1]=new Option(txt,val);
   }
   }   
}
<!--向下移动 -->
function comeback(down){
   high=eval('document.forms[0].'+down);
   if(toList.options.length>0&&toList.options[0].value=="temp"){
             toList.options.length=0;
    }
       for(var i=0;i<high.options.length;i++){
       current = high.options[i];
   yes = high.options[i+1];
   if(current.selected){
   txt1=yes.text;
   var1=yes.value;
   txt =current.text;
   val =current.value;
   high.options[i] =new Option(txt1,var1);    
   high.options[i+1]=new Option(txt,val); 
   high.selectedIndex=current.selecteIndex+1;      
   }
   }
}
<!-- 全部从左到右-->
function eachother(from,to){
    fromList = eval('document.forms[0].'+ from);
toList = eval('document.forms[0].' + to);
        if(toList.size>=0){
 var a;
 var b;
 var x;
 var y;
 var current;
 var yeah;
for(var z=0;z<toList.length;z++){
   yeah=toList.options[z];
   a=yeah.text;
   b=yeah.value;
   toList.options[z] = new Option(a,b);
}
for(var i =0;i<fromList.length;i++){   //判断 以前的是否有值
     current = fromList.options[i];
 x=current.text;
 y=current.value;
 toList.options[i] = new Option(x,y);
}
fromList.options.length=0;
  }else {
    for(var i =0;i<fromList.length;i++){
     current = fromList.options[i];
 x=current.text;
 y=current.value;
 toList.options[i] = new Option(x,y);
}
fromList.options.length=0;
  }
}
<!--全部从右往左 -->
function eachother2(from,to){
    fromList = eval('document.forms[0].'+ from);
toList = eval('document.forms[0].' + to);
if(toList.options.length>0&&toList.options[0].value=="hello"){
  toList.options.length=0;
}
for(var i =0;i<fromList.length;i++){
     current = fromList.options[i];
 x=current.text;
 y=current.value;
 toList.options[i] = new Option(x,y);
             //fromList.options[i] = null;
}
fromList.options.length=0;
}
</script>
<body>
<form id="form1" name="form1" method="post" action="">
  <table width="975" border="0" cellpadding="0" cellspacing="0">
    <!--DWLayoutTable-->
    <tr>
      <td height="64" colspan="6" valign="top"><table width="100%" border="0" cellpadding="0" cellspacing="0">
          <!--DWLayoutTable-->
          <tr>
            <td width="975" height="64">&nbsp;</td>
          </tr>
      </table></td>
    </tr>
    <tr>
      <td width="147" height="350" valign="top"><table width="100%" border="0" cellpadding="0" cellspacing="0">
          <!--DWLayoutTable-->
          <tr>
            <td width="147" height="350" valign="top"><!--DWLayoutEmptyCell-->&nbsp;</td>
          </tr>
      </table></td>
      <td width="286" valign="top"><table width="100%" border="0" cellpadding="0" cellspacing="0">
          <!--DWLayoutTable-->
          <tr>
            <td width="286" height="350" valign="top">
              <select name="select1" style="width:100%; height:100%;" multiple="multiple" size="5">
                <option value="1">通知</option>
                <option value="2">常用网址</option>
                <option value="3">网上调查</option>
<option value="4">最新上传文件</option>
                <option value="5">快捷方式</option>
                <option value="6">桌面便笺</option>
<option value="7">公司通讯录</option>
                <option value="8">公共通讯录</option>
                <option value="9">工作计划</option>
<option value="10">已收文件</option>
                <option value="11">今日工作安排</option>
                <option value="12">短消息</option>
<option value="13">个人通讯录</option>
              </select>
            </td>
          </tr>
      </table></td>
      <td width="46" valign="top"><table width="100%" border="0" cellpadding="0" cellspacing="0">
          <!--DWLayoutTable-->
          <tr>
            <td width="159" height="350" valign="top"><table width="45" border="0">
                <tr>
                  <td width="39" height="57"><input type="button" name="Submit2" value="从左到右;" onclick="javascript:trans('select1','select2')" /></td>
                </tr>
                <tr>
                  <td height="58"><input type="button" name="Submit" value="从右到左"  onclick="javascript:trans('select2','select1')" /></td>
                </tr>
                <tr>
                  <td height="74"><input type="button" name="Submit6" value="全部向右" onclick="eachother('select1','select2')" /></td>
                </tr>
                <tr>
                  <td height="72"><input type="button" name="Submit5" value="全部向左" onclick="eachother('select2','select1')"/></td>
                </tr>
            </table>
            </td>
          </tr>
      </table></td>
      <td width="364" valign="top"><table width="100%" border="0" cellpadding="0" cellspacing="0">
          <!--DWLayoutTable-->
          <tr>
            <td width="364" height="350" valign="top"><select name="select2" style="width:100%; height:100%;"multiple="multiple" size="5">
<option value="temple">从左边区域选择</option>
            </select></td>
          </tr>
      </table></td>
      <td width="51" valign="top"><table width="100%" border="0" cellpadding="0" cellspacing="0">
          <!--DWLayoutTable-->
          <tr>
            <td width="62" height="350" valign="top"><table width="84" height="351" border="1">
                <tr>
                  <td width="74" height="91"><input type="button" name="Submit3" value="向上" onclick="forword('select2')" /></td>
                </tr>
                <tr>
                  <td height="60"><input type="button" name="Submit4" value="向下"  onclick="comeback('select2')"/></td>
                </tr>
                <tr>
                  <td height="76">&nbsp;</td>
                </tr>
                <tr>
                  <td>&nbsp;</td>
                </tr>
            </table></td>
          </tr>
      </table></td>
      <td width="81">&nbsp;</td>
    </tr>
  </table>
</form>
</body>
</html>

解决方案 »

  1.   

    此回复为自动发出,仅用于显示而已，并无任何其他特殊作用
    楼主【BlackSky_Sun】截止到2008-07-29 12:16:07的历史汇总数据(不包括此帖)：
    发帖的总数量:23                       发帖的总分数:320                      每贴平均分数:13                       
    回帖的总数量:15                       得分贴总数量:0                        回帖的得分率:0%                       
    结贴的总数量:22                       结贴的总分数:270                      
    无满意结贴数:9                        无满意结贴分:260                      
    未结的帖子数:1                        未结的总分数:50                       
    结贴的百分比:95.65 %               结分的百分比:84.38 %                  
    无满意结贴率:40.91 %               无满意结分率:96.30 %                  
    值得尊敬