Jquery 服务器回调为select填值

看了jquery库真不错, 蛮好用 在服务器回调方面操作简单 

<script src="http://www.cnblogs.com/Scripts/AC_RunActiveContent.js" type="text/javascript"></script>
<script src="http://www.cnblogs.com/js/jquery.js" type="text/javascript"></script>
<script src="http://www.cnblogs.com/js/jQuery.FillOptions.js" type="text/javascript"></script>
<script src="http://www.cnblogs.com/js/jQuery.CascadingSelect.js" type="text/javascript"></script>
<script type="text/javascript">
    $(document).ready(function(){

   
     $("#select").FillOptions("http://www.cnblogs.com/handler/Handler.ashx?type=xml",{datatype:"xml",textfield:"InfoTypeName",valuefiled:"InfoTypeID",keepold:"true",selected:"0"});
     $("#select").AddOption("选择省份","-1",true,0);
 
     $("#select").CascadingSelect(
            $("#select2"),
                  "http://www.cnblogs.com/handler/Handler.ashx?type=xml",
            {datatype:"xml",textfield:"InfoTypeName",valuefiled:"InfoTypeID",parameter:"p"},
            function(){
                       $("#select2").AddOption("选择城市","-1",true,0);
            }
    );
   
      $("#select2").CascadingSelect(
            $("#select3"),
                  "http://www.cnblogs.com/handler/Handler.ashx?type=xml",
            {datatype:"xml",textfield:"InfoTypeName",valuefiled:"InfoTypeID",parameter:"p"},
            function(){
                       $("#select3").AddOption("选择网点","-1",true,0);
            }
    );
   
     $("#select3").change(function(){
                $.ajax({
                    "type": "get",
                     "url":"http://www.cnblogs.com/handler/Handler2.ashx?typeid="+$("#select3 option[@selected]").val(),
                     "success": function(data) {
                          $("#showinfo").html(data);
                        },
                        "error": function(){
　　                     $("#showinfo").html(data);
                      }

                    });
     });
   
    });
 
</script>