急！有两个下拉框，第一个下拉框为商品分类，第二个......求JAVACRIPT

例:http://www.bxemail.com/AddressBook/export.php代码:
<script language="JavaScript">
var onecount;
onecount=0;
subcat = new Array();subcat[0] = new Array("0","请选择","0");
subcat[1] = new Array("Foxmail","TXT文件(.txt)","txt");
subcat[2] = new Array("Foxmail","CSV文件(.csv)","csv");
subcat[3] = new Array("Foxmail","WAB文件(.wab)","wab");
subcat[4] = new Array("Outlook","TXT文件(.txt)","txt");
subcat[5] = new Array("Outlook","CSV文件(.csv)","csv");
subcat[6] = new Array("Outlook","WAB文件(.wab)","wab");
subcat[7] = new Array("Outlook","名　 片(.vcf)","vcf");
onecount=8;function changelocation(locationid){
document.exportform.exporttype.length=0;
var locationid=locationid;
var i;
for (i=0;i < onecount; i++){
if (subcat[i][0] == locationid){
document.exportform.exporttype.options[document.exportform.exporttype.length] = new Option(subcat[i][1], subcat[i][2]);
}
}
}
function asubmit(){
var s="";
if (document.exportform.software.value=="0") {
alert("请选择要导出通讯录保存Foxmail或Outlook格式！");
document.exportform.software.focus();
return false; 
}
if (document.exportform.exporttype.value=="") {
alert("请选择要通讯录的保存文件格式！");
document.exportform.exporttype.focus();
return false; 
}
s="ture";
return s;
}
</script>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<form name="exportform" method="post" onSubmit="return asubmit();">
  <tr>
    <td>导出通讯录:
<select name="software" onChange="changelocation(document.exportform.software.options[document.exportform.software.selectedIndex].value)" size="1">
                  <option value=0>请选择</option>
                  <option value="Foxmail">Foxmail</option>
                  <option value="Outlook">Outlook</option>
</select>
<select name="exporttype">
<option>请选择</option>
</select>
        　
<input type="submit" name="Submit" value="开始"> </td>
  </tr>
</form>
</table>

解决方案 »

  1.   

    <html>
    <head>
    <script languang="javascript">
    function mm()
    {
        var car=new Array(3);
        var flower=new Array(3);
        var fruit=new Array(3);
        var i;
        
        car[0]="宝马";
        car[1]="奔驰";
        car[2]="东风";
        flower[0]="玫瑰";
        flower[1]="康乃馨";
        flower[2]="菊花";
        fruit[0]="banana";
        fruit[1]="orange";
        fruit[2]="apple";
      
        while(s2.options.length != 0)
             s2.remove(0);
       
        if(s1.selectedIndex == 0)
    for(i=0;i<fruit.length;i++)
                s2.options.add(new Option(fruit[i],i));
           
        
        else if(s1.selectedIndex == 1)
    for(i=0;i<flower.length;i++)
                s2.options.add(new Option(flower[i],i));
        
        if(s1.selectedIndex == 2)
    for(i=0;i<car.length;i++)
          s2.options.add(new Option(car[i],i));
    }
    </script>
    </head>
    <body>
    <select onChange=mm() name="s1">
    <option value=1>水果
    <option value=2>花卉
    <option value=3>汽车
    </select>
    <select name="s2">
    </select>
    </body>
    </html>
      

  2.   

    <form name="doublecombo">
    <p>
    <select name="example" size="1" onChange="redirect(this.options.selectedIndex)">
    <option>国外JavaScript技术网站</option>
    <option>国内JavaScript技术网站</option>
    <option>国外的著名搜索引擎</option>
    </select>
    <select name="stage2" size="1">
    <option value="http://wsabstract.com">Website Abstraction</option>
    <option value="http://www.dynamicdrive.com">Dynamicdrive.com</option>
    <option value="http://javascript.internet.com">JavaScript</option>
    </select>
    <input type="button" name="test" value="Go!"
    onClick="go()">
    </p>
    <script>
    <!--
    /*
      Double Combo Script Credit
      By Website Abstraction (www.wsabstract.com)
      Over 200+ free JavaScripts here!
      */
    var groups=document.doublecombo.example.options.length
      var group=new Array(groups)
      for (i=0; i<groups; i++)
      group[i]=new Array()
    group[0][0]=new Option("Website Abstraction","http://wsabstract.com")
      group[0][1]=new Option("Dynamicdrive.com","http://www.dynamicdrive.com")
      group[0][2]=new Option("JavaScript","http://javascript.internet.com")
    group[1][0]=new Option("万旭JavaScript仓库","http://www.wanxu.com")
      group[1][1]=new Option("JavaScript2000","http://www.javascript2000.com")
      group[1][2]=new Option("无忧脚本","http://www.51js.com")
    group[2][0]=new Option("Hotbot","http://www.hotbot.com")
      group[2][1]=new Option("Infoseek","http://www.infoseek.com")
      group[2][2]=new Option("Excite","http://www.excite.com")
      group[2][3]=new Option("Lycos","http://www.lycos.com")
    var temp=document.doublecombo.stage2
    function redirect(x){
      for (m=temp.options.length-1;m>0;m--)
      temp.options[m]=null
      for (i=0;i<group[x].length;i++){
      temp.options[i]=new Option(group[x][i].text,group[x][i].value)
      }
      temp.options[0].selected=true
      }
    function go(){
      location=temp.options[temp.selectedIndex].value
      }
      //-->
      </script>
      </form>
      

  3.   

    {
    var gh=new Array();
    var xm=new Array();
    var bm=new Array();
    <%  num=0
       sql7="select gh,xm,ksbh from jb_ry  order by ksbh"
       set rs7=conn.execute(sql7) 
       while not rs7.eof %>
       gh[<%=num%>]=<%="'"&trim(rs7("gh"))&"'"%>; xm[<%=num%>]="<%=rs7("xm")%>"; bm[<%=num%>]="<%=trim(rs7("ksbh"))%>" ;
      <% num=num+1
       rs7.movenext
       wend
     %>
     }//通过部门编号过滤人员<option>中的value值为工号
    //bmbh=document.frm.ks.value,ryghxm=放人员下拉框的<td id=>的id号,selectstrhead为下拉框中的头:<select name=> 
    function ryglgh(bmbh,ryghxm,selectstrhead)
    {
     var selectstr;
     var iii;
     selectstr=selectstrhead;
     for (iii=0;iii<<%=num%>;iii++)
     {
       if (bmbh==bm[iii])
       {
       selectstr+="<option value='"+gh[iii]+"'>"+xm[iii]+"</option>";
       }
     }
     selectstr+="</select>";
     eval(ryghxm).innerHTML=selectstr; 
    }