基于MVC4+EasyUI的Web开发框架经验总结（7）--实现省份、城市、行政区三者联动

        private void txtProvince_SelectedIndexChanged(object sender, EventArgs e)
        {
            CListItem item = this.txtProvince.SelectedItem as CListItem;
            if (item != null)
            {
                string provinceId = item.Value;
                this.txtCity.Properties.BeginUpdate();
                this.txtCity.Properties.Items.Clear();
                List<CityInfo> cityList = BLLFactory<City>.Instance.GetCitysByProvinceID(provinceId);
                foreach (CityInfo info in cityList)
                {
                    this.txtCity.Properties.Items.Add(new CListItem(info.CityName, info.ID.ToString()));
                }
                this.txtCity.Properties.EndUpdate();
            }
        }

        private void txtCity_SelectedIndexChanged(object sender, EventArgs e)
        {
            CListItem item = this.txtCity.SelectedItem as CListItem;
            if (item != null)
            {
                string cityId = item.Value;
                this.txtDistrict.Properties.BeginUpdate();
                this.txtDistrict.Properties.Items.Clear();
                List<DistrictInfo> districtList = BLLFactory<District>.Instance.GetDistrictByCity(cityId);
                foreach (DistrictInfo info in districtList)
                {
                    this.txtDistrict.Properties.Items.Add(new CListItem(info.DistrictName, info.ID.ToString()));
                }
                this.txtDistrict.Properties.EndUpdate();
            }
        }

        /// <summary>
        /// 获取所有的省份
        /// </summary>
        /// <returns></returns>
        public ActionResult GetAllProvince()
        {
            List<CListItem> treeList = new List<CListItem>();

            List<ProvinceInfo> provinceList = BLLFactory<Province>.Instance.GetAll();
            foreach (ProvinceInfo info in provinceList)
            {
                treeList.Add(new CListItem(info.ProvinceName, info.ProvinceName));
            }
            return ToJsonContent(treeList);
        }

        /// <summary>
        /// 根据省份名称获取对应的城市列表
        /// </summary>
        /// <param name="provinceName">省份名称</param>
        /// <returns></returns>
        public ActionResult GetCitysByProvinceName(string provinceName)
        {
            List<CListItem> treeList = new List<CListItem>();

            List<CityInfo> cityList = BLLFactory<City>.Instance.GetCitysByProvinceName(provinceName);
            foreach (CityInfo info in cityList)
            {
                treeList.Add(new CListItem(info.CityName, info.CityName));
            }

            return ToJsonContent(treeList);
        }

        /// <summary>
        /// 根据城市名称获取对应的行政区划类别
        /// </summary>
        /// <param name="cityName">城市名称</param>
        /// <returns></returns>
        public ActionResult GetDistrictByCityName(string cityName)
        {
            List<CListItem> treeList = new List<CListItem>();

            string condition = string.Format("");
            List<DistrictInfo> districtList = BLLFactory<District>.Instance.GetDistrictByCityName(cityName);
            foreach (DistrictInfo info in districtList)
            {
                treeList.Add(new CListItem(info.DistrictName, info.DistrictName));
            }

            return ToJsonContent(treeList);
        }

        //绑定省份、城市、行政区信息
        function BindProvinceCity() {
            var province = $('#Province').combobox({
                valueField: 'Value', //值字段
                textField: 'Text', //显示的字段
                url: '/Province/GetAllProvince',
                editable: true,
                onChange: function (newValue, oldValue) {
                    $.get('/City/GetCitysByProvinceName', { provinceName: newValue }, function (data) {
                        city.combobox("clear").combobox('loadData', data);
                        district.combobox("clear")
                    }, 'json');
                }
            });

            var city = $('#City').combobox({
                valueField: 'Value', //值字段
                textField: 'Text', //显示的字段
                editable: true,
                onChange: function (newValue, oldValue) {
                    $.get('/District/GetDistrictByCityName', { cityName: newValue }, function (data) {
                        district.combobox("clear").combobox('loadData', data);
                    }, 'json');
                }
            });

            var district = $('#District').combobox({
                valueField: 'Value', //值字段
                textField: 'Text', //显示的字段
                editable: true
            });
        }

                        <tr>      
                            <th>
                                <label for="Province">所在省份：</label>
                            </th>
                            <td>
                                <select class="easyui-combobox" id="Province" name="Province"  style="width:120px;"></select> 
                            </td>
                            <th>
                                <label for="City">城市：</label>
                            </th>
                            <td>
                                <select class="easyui-combobox" id="City" name="City"  style="width:120px;"></select> 
                            </td>
                        </tr>
                        <tr>
                            <th>
                                <label for="District">所在行政区：</label>
                            </th>
                            <td>
                                <select class="easyui-combobox" id="District" name="District"  style="width:120px;"></select>
                            </td>
                            <th>
                                <label for="Hometown">籍贯：</label>
                            </th>
                            <td>
                                <select class="easyui-combobox" id="Hometown" name="Hometown"  style="width:120px;"></select>
                            </td>
                        </tr>

            $.getJSON("/Contact/FindByID?id=" + ID, function (info) {
                //赋值有几种方式：.datebox('setValue', info.Birthday);.combobox('setValue', info.Status);.val(info.Name);.combotree('setValue', info.PID);
                $("#ID").val(info.ID);
                $("#Customer_ID").val(info.Customer_ID);
                $("#HandNo").val(info.HandNo);
                $("#Name").val(info.Name);

                $("#Province").combobox('setValue', info.Province);
                $("#City").combobox('setValue', info.City);
                $("#District").combobox('setValue', info.District);
                $("#Hometown").combobox('setValue', info.Hometown);
                

..................
            });
        }

            //使用同步方式，使得联动的控件正常显示
            $.ajaxSettings.async = false;

            //首先用户发送一个异步请求去后台实现方法
            $.getJSON("/Contact/FindByID?id=" + ID, function (info) {