MVC实现下拉框联动效果（单选）

下拉框联动效果,我们以部门--职位为例,选择部门时,关联到该部门的职位.下拉框的写法就不多说了,详细请参照前文.

视图:

其中,dept是部门的属性,deptlist是部门下拉框的属性,job是职位的属性,joblist是职位下拉框的属性,下拉框绑定请参照前文

@using (Html.BeginForm("aaai003sch", "aaa", FormMethod.Post, new { @class = "form-horizontal", role = "form" }))
{
 @Html.AntiForgeryToken()
 
  
    
     @Html.LabelFor(m => m.dept, new { @class = "col-sm-2 control-label" })
      
@Html.DropDownListFor(model => model.dept, Model.deptlist, new { @class = "form-control select2 ", style = "width: 100%;" })
@Html.ValidationMessageFor(m => m.dept, "", new { @class = "text-danger" })
      
    
    
    @ Html.LabelFor(m => m.job, new { @class = "col-sm-2 control-label" })
      
@Html.DropDownListFor(model => model.job, Model.joblist, new { @class = "form-control select2 page-select2-area", style = "width: 100%;" })
@Html.ValidationMessageFor(m => m.job, "", new { @class = "text-danger" })
      
    
  
 

当部门变动的时候,职位也相应改变:

//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");
    }
   });
 });

执行js里的URL,这个程式写在控制器里:

  [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);
  }

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