如何在mvc中返回JsonResult

本文介绍了如何在mvc中返回JsonResult的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 [HttpPost] [ValidateAntiForgeryToken] public ActionResult create（n_userdata userdata） { 列表< n_country> allcountry = new List< n_country>（）; List< n_state> allstate = new List< n_state>（）; List< n_city> allcity = new List< n_city>（）; using（nyalkaranEntities db = new nyalkaranEntities（）） { allcountry = db.n_country .OrderBy（v => v.countryname）。ToList（）; if（userdata！= null&& userdata.countryid> 0） { allstate = db.n_state.Where（a => a.countryid.Equals（userdata.countryid））。OrderBy（a => a.state）.ToList（）; } } ViewBag.countryid = new SelectList（allcountry，countryid ，countryname，userdata.countryid）; ViewBag.stateid = new SelectList（allstate，stateid，statename，userdata.stateid）; ViewBag。 cityid = new SelectList（allcity，cityid，cityname，userdata.cityid）; if（ModelState.I sValid） { 使用（nyalkaranEntities db = new nyalkaranEntities（）） { db.n_userdata。添加（userdata）; db.SaveChanges（）; ModelState.Clear（）; userdata = null; ViewBag.messagee =sabmit sussfully done; } } else { ViewBag.messagee =falid please try agen leter; } return View（）; } [HttpGet] public JsonResult （string countryid = ） { List< n_state> allstate = new List< n_state>（）; int id = 0; if（int.TryParse（countryid，out id） ） { 使用（nyalkaranEntities db = new nyalkaranEntities（）） { allstate = db.n_state .Where（a => a.countryid.Equals（id））。OrderBy（a => a.state）.ToList（）; } if （Request.IsAjaxRequest（）） { 返回新的JsonResult { Data = allstate， JsonRequestBehavior = JsonRequestBehavior.AllowGet }; } else { 返回新的JsonResult { Data =no velid rqvest， JsonRequestBehavior = JsonRequestBehavior.DenyGet }; } } 这是我的观点和jqurey [HttpPost] [ValidateAntiForgeryToken] public ActionResult create(n_userdata userdata) { List<n_country> allcountry = new List<n_country>(); List<n_state> allstate = new List<n_state>(); List<n_city> allcity = new List<n_city>(); using (nyalkaranEntities db = new nyalkaranEntities()) { allcountry = db.n_country.OrderBy(v => v.countryname).ToList(); if(userdata !=null && userdata.countryid>0) { allstate = db.n_state.Where(a => a.countryid.Equals(userdata.countryid)).OrderBy(a => a.state).ToList(); } } ViewBag.countryid = new SelectList(allcountry, "countryid", "countryname",userdata.countryid); ViewBag.stateid = new SelectList(allstate, "stateid", "statename",userdata.stateid); ViewBag.cityid = new SelectList(allcity, "cityid", "cityname",userdata.cityid); if (ModelState.IsValid) { using(nyalkaranEntities db= new nyalkaranEntities()) { db.n_userdata.Add(userdata); db.SaveChanges(); ModelState.Clear(); userdata = null; ViewBag.messagee="sabmit sussesfully done"; } } else { ViewBag.messagee = "falid please try agen leter"; } return View(); } [HttpGet] public JsonResult (string countryid = "") { List<n_state> allstate = new List<n_state>(); int id = 0; if(int.TryParse(countryid, out id)) { using (nyalkaranEntities db = new nyalkaranEntities()) { allstate = db.n_state.Where(a => a.countryid.Equals(id)).OrderBy(a => a.state).ToList(); } if (Request.IsAjaxRequest()) { return new JsonResult { Data = allstate, JsonRequestBehavior = JsonRequestBehavior.AllowGet }; } else { return new JsonResult { Data = "no velid rqvest", JsonRequestBehavior = JsonRequestBehavior.DenyGet }; } }this is my view and jqurey @ Html.DropDownListFor（model => model.CountryID，@ ViewBag.countryid作为SelectList，选择国家） @ Html.ValidationMessageFor（model => model.CountryID） @Html.DropDownListFor(model => model.CountryID,@ViewBag.countryid as SelectList,"select country") @Html.ValidationMessageFor(model => model.CountryID) @ Html.LabelFor（model => model.StateID） @Html.LabelFor(model => model.StateID) @ Html.DropDownListFor（model => model.StateID，@ ViewBag。 stateid为SelectList，select state） @ Html.ValidationMessageFor（model => model.StateID） @Html.DropDownListFor(model => model.StateID, @ViewBag.stateid as SelectList,"select state") @Html.ValidationMessageFor(model => model.StateID) < input type =submitvalue =创建/> <input type="submit" value="Create" /> @ Html.ActionLink（返回列表 ，索引） @Html.ActionLink("Back to List", "Index") @section脚本{ @ Scripts.Render （〜/ bundles / jqueryval） < script type =text / javascript> ; $（文件）.ready（function（）{ //这是调用wen country ddl is change $（＃CountryID）。更改（功能（）{ var countryid = parseInt（$（＃CountryID）。val（））; if（！NaN（countryid））{ var ddstate = $（＃ StateID）; ddstate.empty（）; ddstate.append（$（< option>< / option>）。val（） .html（选择状态））; $ .ajax（{ url： @ Url.Action（Getstates，user）， 类型：GET， 数据：{countryid：countryid}， 数据类型：json， 成功：函数（数据）{ $ .each（data，func） （i，val）{ ddstate.append（ $（< option>< / option>）。val（val.StateID）.html （val.StateName） ）; }）; }， 错误：function（）{ 提醒（错误!!!）; } }）; } }）; }） ; < / script> } // //国家/地区列表已填写但状态列表未填写@section Scripts { @Scripts.Render("~/bundles/jqueryval")<script type="text/javascript"> $(document).ready(function () { // this is call wen country ddl is change $("#CountryID").change(function () { var countryid = parseInt($("#CountryID").val()); if (!NaN(countryid)) { var ddstate = $("#StateID"); ddstate.empty(); ddstate.append($("<option></option>").val("").html("select state")); $.ajax({ url:"@Url.Action("Getstates","user")", type: "GET", data: { countryid: countryid }, datatype: "json", success: function (data) { $.each(data, function (i, val) { ddstate.append( $("<option></option>").val(val.StateID).html(val.StateName) ); }); }, error: function () { alert("error!!!"); } }); } }); });</script>}////the country list is fill but state list is not fill推荐答案 （document）.ready（function（）{ //这是调用wen countr y ddl是变更 (document).ready(function () { // this is call wen country ddl is change （＃CountryID）。change（function（）{ var countryid = parseInt（("#CountryID").change(function () { var countryid = parseInt( （＃CountryID）。val（））; if（！NaN（countryid））{ var ddstate = ("#CountryID").val()); if (!NaN(countryid)) { var ddstate = 这篇关于如何在mvc中返回JsonResult的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！