2级分类选择

 页面JS代码

<script type="text/javascript">
    function GetTypeByParentID(id) {
        $("#ChildType").empty();
        $("#ChildType").children().remove();
        $.ajax({
            url: '/Entry/GetSecondType/' + $(id).val(),
            type: "get",
            datatype: "json",
            success: function (data) {
                $.each(data, function (i, item) {
                    $("<input id="TypeId" type="radio"name="TypeId">" + item["Name"] + "</input>")
                    .val(item["Id"])
                    .appendTo($("#ChildType"));
                });
            }
        });
    }
</script>

　　Controller里的代码   

 [HttpGet]
        public ActionResult Form(int? id) 
        {
            QueryType();
            EntryModel model = new EntryModel();
            if (id != null)
            {
                model = business.Get(id.Value);
            }
            return View(model);
        }

        private void QueryType()
        {
            EntryTypeRepository rep = new EntryTypeRepository();
            var list = rep.QueryByParentId(0);
            var select = new List<SelectListItem>();
            foreach (var item in list)
            {
                select.Add(new SelectListItem() { Text=item.Name,Value = item.Id.ToString()});
            }
            ViewBag.TypeList = select;
        }

        public ActionResult GetSecondType(int id = 0)
        {
            var list = new List<EntryTypeModel>();
            if (id != 0)
            {
                EntryTypeRepository rep = new EntryTypeRepository();
                list = rep.QueryByParentId(id);
            }
            else{
                list = new List<EntryTypeModel>();
            }
            return Json(list, JsonRequestBehavior.AllowGet);
        }

        [HttpPost]
        [ValidateInput(false)]
        public ActionResult Form(EntryModel model)
        {
            if (ModelState.IsValid)
            {
                if (model.Id == 0)
                {
                    business.Add(model);
                }
                else
                {
                    business.Update(model.Id,model);
                }
                ViewBag.Msg = "添加成功！";
                ViewBag.ReturnUrl = "/Entry/List";
                QueryType();
            }           
            return View();        
        }