spring mvc 2个select框取值

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首先，js代码

function test(){ var pro=$("#activity_project").val();   $.ajax({           type: "POST",           url: "${pageContext.request.contextPath}/video/selectchild",           data: { //发送给数据库的数据               idKey:pro               },           dataType: 'json',           success: function(data) {            $("#activity_taskid").empty();                $.each(data.tasks, function(index,item){                 //alert(item.specification);                 //$("#activity_taskid").empty();                 $("#activity_taskid").append("<option>"+item.specification+"</option>");                });               }                   });         }

然后是页面代码

<tr><td>频道:</td><td><sf:select id="activity_project" path="category" onchange="test()" style="width:150px">                                        <sf:option value="0">--请选择--</sf:option>                      <sf:options items="${categoryList}"/>                    </sf:select></td></tr>    <tr><td>栏目:</td>                    <td>                    <sf:select id="activity_taskid" path="colunm" style="width:150px">                       <sf:option value="0" id="selectchild">--请选择--</sf:option>                    </sf:select></td></tr>

controller代码

      List<Category> categoryListchild=null;        categoryListchild=videoService.getlist(hql);       Map josnMap = new HashMap();       List list=new ArrayList();       if(categoryListchild.size()>0){          for(int i=0;i<categoryListchild.size();i++){      String name=categoryListchild.get(i).getName();      Map taskMap=new HashMap();      taskMap.put("specification",name);      list.add(taskMap);    }              }       josnMap.put("tasks",list);         return JSONObject.fromObject(josnMap);

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