我的第一个AJAX程序

Author:zfive5(zhaozidong)
Email :zfive5@yahoo.com.cn

礼拜五下午公司网站维护的同事问我怎样实现一个功能，一个提
交页上有两个select，第二个select根据第一个select变，我的
第一念头就是用ajax！

test.htm:

<html>
<head>
<script type="text/javascript">
 var xmlhttp;
 function GetContent(param)
 {
      url="";
      if(window.ActiveXObject)
      {
         xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
      else if(window.XMLHttpRequest)
      {
         xmlhttp=new XMLHttpRequest();
      }

     
     
      if(param==0)
      {
         url="zfive5.htm";
      }
      else
      {
         url="zfive6.htm";     
      }
             
      xmlhttp.open("GET",url);
      xmlhttp.onreadystatechange=oncallback;
      xmlhttp.send(url);
     
 }

 function oncallback()
 {
      if(xmlhttp.readyState==4)
      {
         if(xmlhttp.status==200)
         {
            document.getElementById("zfive5").innerHTML=xmlhttp.responseText;   
         }
      }
 }
</script>
</head>
<body>
    <form method="get"  id="zf5" action="#">
       <table>
         <tr>
            <td>
                Type:<select id="name1" onchange="javascript:GetContent(this.selectedIndex);" >
                     <option value="1" selected>1.zfive5</option>
                     <option value="2">2.zfive6</option>
                     </select>
            </td>
            <td id=zfive5>
                Person:<select id="name2" NAME="name2">
                       <option value="zfive5">zfive5</option>
                       <option value="zqqa">zqqa</option>
                       </select>
            </td>
         </tr>
        </table>
      </form>
</body>
</html>

zfive5.htm:

Person:<select id="name2">
<option value="zfive5">zfive5</option>
<option value="zqqa">zqqa</option>
</select>

zfive6.htm:

Person:<select id="name2">
<option value="zfive6">zfive6</option>
<option value="zqqa">zqqa</option>
</select>

效果不错！！！

笔记本内存升1G了!