页面：

<tr>

			<td class="label" width="300" >作业计划项模板</td>

			<td>

				<select name="modelId" size="1" style="width: 6.8cm;" id="s1"  subid="s2" onchange="javascript:chooseFunction();">

                           <option value="">请选择</option>

                 			<%for(int i=0;i<modellist.size();i++){

                 			TawwpModelVO tawwpModelVO = (TawwpModelVO)modellist.get(i);%>

                 			<option value='<%=tawwpModelVO.getId()%>'><%=tawwpModelVO.getModelName()%></option>

                 			<% }%>

                 </select>

			</td>

		</tr>

		<tr>

			<td class="label"  >

			作业计划项名称

			</td>

			<td>

				<input id="f1" type="hidden"  style="width: 6.8cm;">

				<select name="functionId" size="1" style="width: 6.8cm;" id="s2" >

                </select>

			 </td>

		</tr>	

前台页面的调用：

前台接收到 json 的处理

Ext.Ajax.request({

		method:'post',

               	url: '../assessmodel/functionContent.do?functionId='+id,

               	success: function(json){

					  var aa = json.responseText;

					  var data = eval('('+aa+')');

					  var bb=data.rows;

					  var sele = document.getElementById("s2");

					  sele.innerHTML = "";

					  var option2 = document.createElement('option');

					  	option2.value ="";

					  	option2.text= "请选择";

					  	option2.selected="selected";

					  	sele.add(option2);

					  for(var i=0;i<bb.length;i++){

					  	var option = document.createElement('option');

					  	option.value = bb[i].id;

					  	option.text= bb[i].name;

					  	sele.add(option);

					  }

				},

               failure : function() {

                      alert("加载数据异常");

        	  }

           });	

后台的处理：

private ActionForward findFunction(ActionMapping mapping, ActionForm form,

			HttpServletRequest request, HttpServletResponse response) {

		IAssessModelMgr assessModelMgr = (IAssessModelMgr) getBean("assessModelMgr");

		String id = request.getParameter("functionId");

		List assList =null;

		List nList = new ArrayList();

		try {

			assList = assessModelMgr.findFunctionList(id);

			//request.setAttribute("functionList",assList);

			for(int i=0;i<assList.size();i++){

				Map map = new HashMap();

				TawwpModelContentVO  fu = new  TawwpModelContentVO();

				fu=(TawwpModelContentVO)assList.get(i);

				map.put("id", fu.getContendid());

				map.put("name",fu.getName());

				nList.add(map);

			}

			response.setContentType("text/xml;charset=UTF-8");

			// 返回JSON对象

			response.getWriter().print(JSONUtil.list2JSON(nList));

			return null;

		} catch (Exception e) {

			//generalError(request, e);

			ActionMessages messages = new ActionMessages();

			messages.add(ActionMessages.GLOBAL_MESSAGE, new ActionMessage(

					"submit.title.failure"));

			saveMessages(request, messages);

			return mapping.findForward("failure");

		}

	}