谁能给点实现类似功能的关键的javascript方法
或者思路吗?

解决方案 »

  1.   

    我这儿有个类似的,可以看看(在网上下的)
      
    <html>
    <head>
    <title>List</title>
    <meta http-equiv="Content-Type" content="text/html; c
    harset=gb2312">
    <script LANGUAGE="javascript">
    <!--
    var onecount;
    onecount=0;subcat = new Array();
    subcat[0] = new Array("徐汇区","01","001");
    subcat[1] = new Array("嘉定区","01","002");
    subcat[2] = new Array("黄浦区","01","003");
    subcat[3] = new Array("南昌市","02","004");
    subcat[4] = new Array("九江市","02","005");
    subcat[5] = new Array("上饶市","02","006");onecount=6;function changelocation(locationid)
    {
    document.myform.smalllocation.length = 0;var locationid=locationid;
    var i;
    document.myform.smalllocation.options[0] = new Option('====所有地区====','');
    for (i=0;i <onecount; i++)
    {
    if (subcat[i][1] == locationid)
    {
    document.myform.smalllocation.options[document.myform.smalllocation.length]
    = new Option(subcat[i][0], subcat[i][2]);
    }
    }}
    </script>
    </head>
    <body>
    <form name="myform" method="post">
    <select name="biglocation"
    onChange="changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value)">
    <option value="01" selected>上海</option>
    <option value="02">江西</option>
    </select>
    <select name="smalllocation">
    <option selected value="">==所有地区==</option>
    </select>
    </form>
    <script LANGUAGE="javascript">
    <!--
    changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value);
    //-->
    </script>
    </body>
    </html>