Ajax+json实现菜单动态级联

1：jsp

//级联ajax处理函数

function areaChange(){
    var areano=document.all("areaNo").value;
    var url="${pageContext.request.contextPath}/infoAction.do?method=queryPeopleByPosition";
      $.post(url,{areaNo:areano,position:"200"},
        function(personList){ 
              var personList=personList.personList; 
              $("#businessManager").empty();//删除所有option选项
              document.all("businessManager").options.add(new Option('-请选择-',''));
              for(var p in personList){
                 document.all("businessManager").options.add(new Option(personList[p],personList[p]));
              }               
        },"json");
    }

<td>地区</td>
<td>
       <html:select property="areaNo" style="width: 80px" onchange="areaChange()">
              <html:option value="">-请选择-</html:option>
              <c:forEach items="${listArea }" var="i">
               <html:option value="${i.nodeNo }">${i.nodeName }</html:option>
              </c:forEach>
             </html:select>
</td>
<td>业务经理</td>
<td>
             <html:select property="businessManager" styleId="businessManager" style="width: 80px">
              <html:option value="">-请选择-</html:option>
              <c:forEach items="${teamList}" var="i">
               <html:option value="${i.staffName }">${i.staffName }</html:option>
              </c:forEach>
             </html:select>
</td>

2、java处理方法

//查询根据地区动态查询对应职级人员信息（动态级联使用）
 public ActionForward queryPeopleByPosition(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response)throws Exception{
  try {
   String areaNo=request.getParameter("areaNo");
   String position=request.getParameter("position");
   P2pStaffInfo queryParams = new StaffInfo();
      queryParams.setAreaNo(areaNo);// 地区
      queryParams.setPosition(position);//

List<StaffInfo> personJavaList = infoLogic.queryStaffInfo(queryParams);

JSONObject personList=new JSONObject();
   JSONObject person=new JSONObject();
   if (null!=personJavaList&&personJavaList.size()>0) {
    for (P2pStaffInfo po:personJavaList) {
     person.put(po.getStaffName(), po.getStaffName());
    }
   }
   personList.put("personList", person);
   response.setCharacterEncoding("gbk");
   PrintWriter pw=response.getWriter();
   pw.write(personList.toString());
   pw.flush();
   pw.close();
  } catch (Exception e) {
   log.error("根据职级动态级联地区查询出错！", e);
   e.printStackTrace();
  }
  return null;
 }