俺的小作品：根据下拉列表动态在列表框中显示，并实现2个列表框互斥选择

具体功能用一下就知道了，在下拉框中选择一个，左边的列表框就显示相应的值，点那4个按钮能够实现左右2个列表框选项互相排斥，很好玩的。。估计大家开发的时候经常要用到，所以就帖上来了。

代码如下：
<style>
td,select,input{font-size:9pt}
</style>
<script>
var subcat = new Array();                                      //  下拉列表数组定义
    subcat[0] = new Array("计划采购员B","2","cs101");
    subcat[1] = new Array("仓库管理员B","2","cs111");
    subcat[2] = new Array("仓库管理员","1","111");
    subcat[3] = new Array("门市管理员","1","122");
    subcat[4] = new Array("计划审批员","1","MASTER");
    subcat[5] = new Array("计划审批员B","2","cs100");
    subcat[6] = new Array("计划采购员","1","103");
    subcat[7] = new Array("统计员","1","李尚英");
    subcat[8] = new Array("统计员B","2","cs133");
                                                        //   这个数组可以根据实际需要用程序继续添加元素
var onecount=subcat.length;
var c=0;d=0;                                            //     2个select的optoins的索引位置...

function moveto2(fn,s1,s2)                                //     ">>" Button function
{
    fs1=eval(fn+"."+s1);                                //      formName1.SelectName1
    fs2=eval(fn+"."+s2);
    d=fs2.options.length;
    for(i=0;i<fs1.options.length;i++)
        {
            var myOption = new

            Option(fs1.options[i].innerText,fs1.options[i].value);  

            fs2.options[d]=myOption ;
            fs2.options[d].selected=true;
            fs1.options[i].selected=true;
            d++;
        }
    k=0;
    while(k<fs1.options.length)
        {
            fs1.remove(k);
            c--;
        }
}

function moveto1(fn,s1,s2)    //    "<<" Button
{
   fs1=eval(fn+"."+s1);
   fs2=eval(fn+"."+s2);
   c=fs1.options.length;
   for(i=0;i<fs2.options.length;i++)
      {
            var myOption = new

            Option(fs2.options[i].innerText,fs2.options[i].value);  

            fs1.options[c]=myOption ;
            fs1.options[c].selected=true;
            fs2.options[i].selected=true;
            c++;
      }
   k=0;
   while(k<fs2.options.length)
        {
            fs2.remove(k);
            d--;
        }
}

function move1to2(fn,s1,s2)    //      ">" Button
{
    fs1=eval(fn+"."+s1);
    fs2=eval(fn+"."+s2);
    c=fs1.options.length;
    d=fs2.options.length;
    for(i=0;i<fs1.options.length;i++)
        {
            if(fs1.options[i].selected)
                {    
                    var myOption = new
Option(fs1.options[i].innerText,fs1.options[i].value);  

                    fs2.options[d]=myOption ;
                    fs2.options[d].selected=true;
                    d++;
                }
        }
    k=0;
    while(k<fs1.options.length+3)                             //   这里为什么要+3，我也不知道
        {
            del(fn,s1,s2);
            k++;
        }
}

function del(fn,s1,s2)                                         //   删除选择的列表项目
{
    fs1=eval(fn+"."+s1);
    fs2=eval(fn+"."+s2);
    for(i=0;i<fs1.options.length;i++)
        {
            if(fs1.options[i].selected)
                {    
                    fs1.remove(i);
                    c--;
                }
        }
}

function move2to1(fn,s1,s2)    //       "<" Button
{   
      fs1=eval(fn+"."+s1);
    fs2=eval(fn+"."+s2);
    c=fs1.options.length;
    for(i=0;i<fs2.options.length;i++)
        {
            if(fs2.options[i].selected)
                {    
                    var myOption = new
Option(fs2.options[i].innerText,fs2.options[i].value);  

                    fs1.options[c]=myOption ;
                    fs1.options[c].selected=true;
                    c++;
                }
        }
    k=0;
    while(k<fs2.options.length+3)
        {
            del1(fn,s1,s2);
            k++;
        }
}

function del1(fn,s1,s2)
{
    fs1=eval(fn+"."+s1);
    fs2=eval(fn+"."+s2);
    for(i=0;i<fs2.options.length;i++)
        {
            if(fs2.options[i].selected)
                {    
                    fs2.remove(i);
                    d--;
                }
        }
}

function changelocation(locationid)                    // 根据选择下拉框动态改变下面的列表内容，可要可不要
    {
    form1.src1.length = 0;
    var locationid=locationid;
    var i;
    for (i=0;i < onecount; i++)
        {
            if (subcat[i][1] == locationid)
            {
                form1.src1.options[form1.src1.length] = new Option(subcat[i][0], subcat[i][0]);
            }        
        }
        
    }
</script>
<form method="POST" name=form1>
  <div align="center">
    <center>
    <table border="1" cellspacing="0" width="80%" bordercolorlight="#808080" bordercolordark="#FFFFFF" bgcolor="#F7F7F7">
      <tr>
        <td width="100" align="right" valign="middle">接收人：</td>
        <td width="195">
<select  size="1" name="ms" onChange="changelocation(this.value)">
<option value="1">石油总公司物资</option>
<option value="2">市石油公司物业公司</option>
</select>
    <select size="8" name="src1" multiple>
        <option value="1">Tindy省石油物资设备公司</option>
          </select></td>
        <td width="61" valign="middle">
           
          <input type="button" value=" > " name="B3" onclick="move1to2(@#form1@#,@#src1@#,@#src2@#)" style="background-color: #FFFFF4; border: 1 ridge #C0C0C0"><br>
          <br>
           
          <input type="button" value=" < " name="B4" onclick="move2to1(@#form1@#,@#src1@#,@#src2@#)" style="background-color: #FFFFF4; border: 1 ridge #C0C0C0"><br>
          <br>
           
          <input type="button" value=" >> " name="B5" onclick="moveto2(@#form1@#,@#src1@#,@#src2@#)" style="background-color: #FFFFF4; border: 1 ridge #C0C0C0"><br>
          <br>
           
          <input type="button" value=" << " name="B6" onclick="moveto1(@#form1@#,@#src1@#,@#src2@#)" style="background-color: #FFFFF4; border: 1 ridge #C0C0C0"></td>
        <td width="241">    <select size="8" name="src2" multiple>
          </select></td>
      </tr>
    </table>
    </center>
  </div>
</form>
<script>
form1.src2.style.pixelWidth=form1.src1.scrollWidth;                //  让2个select一样的宽，是个好东东
</script>

原文转自：http://www.ltesting.net