不限级别联动

1 <div class="col-md-4">
2    @Html.DropDownList("infoSectionId", ViewData["InfoSectionFather"] as SelectList,"---请选择")
3    <span id="spanChild"></span>
4    </div>

  $(document).ready(function() {
//当点击第一个下拉框时
            $("#infoSectionId").change(function () {
            
                var selsecid = $(this).find("option:selected").val();
                GetChildRen(selsecid, "spanChild");
                $("#ChangeInfoSectionHidden").val(selsecid);
            });

            $("#spanChild").on("change", ".childselectshowlist", function (event) {
                var selsecid = $(this).find("option:selected").val();
                var selectText = $(this).find("option:selected").html();
                getChildRecTwo(selsecid, "spanChild", $("#spanChild select").index(this));
                $("#ChangeInfoSectionHidden").val(selsecid);//得到点击后的值

            });
        });

/// <summary>得到子级</summary>
        function GetChildRen(secid, domMainContain) {
            var selectpar = $("#" + domMainContain);
            selectpar.html("");
            if (secid == null || secid == -1) {
                return;
            }
            selectpar.append("<img src=‘/Content/Images/loading4.gif‘ id=‘childclassloadimgimg‘ />");
            $.post("/InfoSection/GetChild?q=" + new Date().getTime(), {
                ‘id‘: secid
            }, function(data) {
                //  alert(eval(data));
                $("#childclassloadimgimg").remove();
                if (eval(data).length > 0) {
                    var timeid = "classshowlist" + new Date().getTime();
                    selectpar.append(‘<select id="‘ + timeid + ‘" class="childselectshowlist" style="margin:0px 0px 0px 10px;"></select>‘);
                    selectpar.find("#" + timeid).append("<option value=‘-1‘ >请选择</option>");
                    $.each(eval(data), function(i, val) {
                        selectpar.find("#" + timeid).append("<option value=‘" + val.id + "‘>" + val.name + "</option>");
                    });
                }
            }, ‘json‘);
        };

  [AuthorizationCodeAttribute]
        [Description("查询分类目录")]
        [HttpPost]
        public ActionResult GetChild()
        {
            string strId = Request.Params["id"];
            List<Hashtable> hashSectionList = new List<Hashtable>();
            int id = 0;
            int.TryParse(strId, out id);
            if (id > 0)
            {
                InfoSectionOperator dal = new InfoSectionOperator();
                IList<InfoSection> ilList = dal.GetList(string.Format("ParentId={0}", id));
                if (ilList.Count > 0)
                {
                    hashSectionList.AddRange(ilList.Select(FormtSimpData));
                }
            }
            return Json(hashSectionList, JsonRequestBehavior.AllowGet);
        }