本文实例为大家分享了jQuery Ajax实现下拉框无刷新联动的具体代码，供大家参考，具体内容如下

@using DAL;
@using System.Data;

@{
AreaDal areaDal = new AreaDal();
string areaId = ViewBag.areaId;
DataRow drArea = areaDal.GetArea(areaId);
string countyId = drArea == null ? "-1" : drArea["countyId"].ToString();
DataRow drCounty = areaDal.GetCounty(countyId);
string cityId = drCounty == null ? "-1" : drCounty["cityId"].ToString();
DataRow drCity = areaDal.GetCity(cityId);
string provinceId = drCity == null ? "-1" : drCity["provinceId"].ToString();
}

<!DOCTYPE html>

商<a href="https://www.jb51.cc/tag/quanxuan/" target="_blank" class="keywords">圈选</a>择

Controller代码：

namespace Controllers.Backstage
{
///

/// 行政区划
///

public class AreaController : AdminBaseController
{

region 构造函数及变量

private <a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>iteHelper.<a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>iteHelper <a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>iteHelper;
private AreaDal areaDal;

public AreaController()
{
  <a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>iteHelper = new <a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>iteHelper.<a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>iteHelper();
  areaDal = new AreaDal();
}
#endregion

#region 行政区划商圈级联选择<a href="https://www.jb51.cc/tag/yemian/" target="_blank" class="keywords">页面</a>
public ActionResult AreaSelect()
{
  return PartialView();
}
#endregion

#region <a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>全部省
public ActionResult GetProvinces()
{
  DataTable dt = areaDal.GetProvincesAll();

  StringBuilder sbHtml = new StringBuilder();
  sbHtml.Append("<option value='-1'>==请选择==</option>");
  foreach (DataRow dr in dt.Rows)
  {
    sbHtml.AppendFormat("<option value='{0}'>{1}</option>",dr["id"].ToString(),dr["name"].ToString());
  }

  return Content(sbHtml.ToString());
}
#endregion

#region 根据省<a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>市
public ActionResult GetCities(string provinceId)
{
  DataTable dt = areaDal.GetCities(provinceId);

  StringBuilder sbHtml = new StringBuilder();
  sbHtml.Append("<option value='-1'>==请选择==</option>");
  foreach (DataRow dr in dt.Rows)
  {
    sbHtml.AppendFormat("<option value='{0}'>{1}</option>",dr["name"].ToString());
  }

  return Content(sbHtml.ToString());
}
#endregion

#region 根据市<a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>区县
public ActionResult GetCounties(string cityId)
{
  DataTable dt = areaDal.GetCounties(cityId);

  StringBuilder sbHtml = new StringBuilder();
  sbHtml.Append("<option value='-1'>==请选择==</option>");
  foreach (DataRow dr in dt.Rows)
  {
    sbHtml.AppendFormat("<option value='{0}'>{1}</option>",dr["name"].ToString());
  }

  return Content(sbHtml.ToString());
}
#endregion

#region 根据区县<a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a>商圈
public ActionResult GetAreas(string countyId)
{
  DataTable dt = areaDal.GetAreas(countyId);

  StringBuilder sbHtml = new StringBuilder();
  sbHtml.Append("<option value='-1'>==请选择==</option>");
  foreach (DataRow dr in dt.Rows)
  {
    sbHtml.AppendFormat("<option value='{0}'>{1}</option>",dr["name"].ToString());
  }

  return Content(sbHtml.ToString());
}
#endregion

}
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程之家。

原文链接：https://www.f2er.com/jquery/34844.html

基于jQuery Ajax实现下拉框无刷新联动

region 构造函数及变量

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