MVC实现下拉框联动的实例详解

这篇文章主要为大家详细介绍了MVC实现下拉框联动效果，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

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()
 <p class=modal-body>
  <p class=form-horizontal>
    <p class=form-group>
     @Html.LabelFor(m => m.dept, new { @class = col-sm-2 control-label })
      <p class=col-sm-10>
       @Html.DropDownListFor(model => model.dept, Model.deptlist, new { @class = form-control select2 , style = width: 100%; })
       @Html.ValidationMessageFor(m => m.dept, , new { @class = text-danger })
      </p>
    </p>
    <p class=form-group>
    @ Html.LabelFor(m => m.job, new { @class = col-sm-2 control-label })
      <p class=col-sm-10>
       @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 })
      </p>
    </p>
  </p>
 </p>
</p>

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($('<option></option>').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);
  }