MVC实现下拉框联动效果（单选）_实用技巧_

 //根据城市获取酒店 $("#dept").change(function () { var url = rootUrl + "aaa/GetJobByDept"; var dept = $(this).val(); //获取部门的值 var job = $("#job"); job.empty(); //清空当前职位的值 //这句很重要，因我们用的是select2插件，若没有用这个插件可以去掉这句 job.select2('val', ''); $.ajax({ cache: false, type: "GET", url: url, data: { "Dept": dept}, success: function (data) { $.each(data, function (id, option) { job.append($('').val(option.Id).html(option.Name)); }); job.trigger('change'); }, error: function (xhr, ajaxOptions, thrownError) { toastr["error"]("请选择部门"); } }); }); 

 [Description("根据部门获取职位")] [AcceptVerbs(HttpVerbs.Get)] [LoginAllowView] public ActionResult GetJobByDept(string dept) { if (String.IsNullOrEmpty(dept)) { throw new ArgumentNullException("dept"); } StringBuilder sb = new StringBuilder(); sb = new StringBuilder(); sb.Append(" SELECT jobid,jobname "); sb.Append(" FROM job_file "); sb.Append(" LEFT JOIN dept_file ON jobdept = deptid "); sb.AppendFormat(" WHERE deptid='{0}'", dept); DataTable dt = sqlHelper.getData(sb.ToString()); var result = dt.AsEnumerable().Select(row => new Item { Name = Utils.ObjToStr(row["jobname"]), Id = Utils.ObjToInt(row["jobid"], 0) }).ToList(); return Json(result, JsonRequestBehavior.AllowGet); }