//js代码
//城市下拉列表
$("#selPro").change(function() { var option = ""; $.ajax({ type: "post", url: "homeHandler/HomeProvince.ashx", dataType: "json", data: "proStr=" + $("#selPro").val(), success: function(message) { if (message != null) { $("#selCity option").remove(); option += "<option value=\"0\">==请选择==</option>"; $.each(message.city, function(i, item) { option += "<option value=\"" + item.id + "\">" + item.name + "</option>"; }); } $("#selCity").append(option); } }); }); public void ProcessRequest(HttpContext context) { //得到城市Id int proId = Convert.ToInt32(context.Request.Params["proStr"]); if (proId != 0) { //根据城市Id查询城市下的区县 List<City> listCity = CityManager.GetAllByProId(proId); int i = 0; StringBuilder strJSON = new StringBuilder(); strJSON.Append("{\"city\":["); foreach (City city in listCity) { if (i < (listCity.Count - 1)) { strJSON.Append("{"); strJSON.Append("\"id\":"); strJSON.Append(Convert.ToInt32(city.CityId)); strJSON.Append(","); strJSON.Append("\"name\":\""); strJSON.Append(city.CityName); strJSON.Append("\"},"); } if (i == (listCity.Count - 1)) { strJSON.Append("{"); strJSON.Append("\"id\":"); strJSON.Append(Convert.ToInt32(city.CityId)); strJSON.Append(","); strJSON.Append("\"name\":\""); strJSON.Append(city.CityName); strJSON.Append("\"}"); } i++; } strJSON.Append("]}"); context.Response.Write(strJSON.ToString()); } }ashx 文件 与js文件数据交互,布布扣,bubuko.com
原文：http://www.cnblogs.com/jf-guo/p/3927378.html