function querySub(id,sid/*选中的项*/){
$.post('${path}/page/article/querySubChannelArticle.action',
  {'channelId':id},function(data){
  $('select[name="article.subChannel.subId"] option[value!=""]').remove();
  var jsonObj = data;   
  for ( var i = 0; i < jsonObj.length; i++) {
      var $option = $('');
      $option.attr('value',jsonObj[i].subId);
      if(jsonObj[i].subId === sid){
   $option.attr('selected',true);
      }
      $option.text(jsonObj[i].subName);
      $('select[name="article.subChannel.subId"]').append($option);
  }
 });
}
$(function(){
 querySub(,);
});
 

  一级栏目
  
 



  二级栏目
 
 
 

public String querySubChannelArticle(){ 
HttpServletResponse response=getResponse();
HttpServletRequest request=getRequest();
 response.setContentType("application/json; charset=UTF-8");
 PrintWriter out =null;
 try {
     out = response.getWriter();

     List list = new LinkedList();
     if(channelId!=null && !channelId.equals("")){
  Channel tmp = new Channel();
  tmp.setChannelId(Integer.parseInt(channelId));
  subChannelList = subChannelDAO.listSubChannel(tmp);

  for(Object oo:subChannelList){
  Map obj = new HashMap();
  SubChannel c = (SubChannel)oo;
  obj.put("subId", c.getSubId());
  obj.put("subName", c.getSubName());
  list.add(obj);
  }
     }
     String outStr = JsonUtil.toJSONStr(list);
     out.println(outStr);
 }catch(Exception e){
 e.printStackTrace();
 }
 out.flush();
 out.close();
 return null;
}