Javascript mvc函数返回的AJAX调用数据未定义

我知道这个问题以前被问过1000次，但我遇到了麻烦。^我创建了一个web应用程序，可以插入用户数据和用户反馈，下面的代码基本上是PhoneGap应用程序的一部分。奇怪的是，这段代码在网络浏览器中运行良好，但在通过Xcode的Phonegap输出iPad中却无法运行

因此，有人知道为什么在成功回调和alertdata.ResultId之后，下面的AJAX调用会出现未定义的错误吗，感谢您的帮助。 谢谢大家!

// POST: /Result/Create
[HttpPost]
public ActionResult Create(Result result)
{
    if (ModelState.IsValid)
    {
        result.ResultDate = DateTime.Now;
        repository.InsertResult(result);
        repository.Save();

        if (Request.IsAjaxRequest())
        {
            int ResultId = result.ResultId;

            try
            {   //valid database entry..send back new ResultId
                return Json(new { Success = true, ResultId, JsonRequestBehavior.AllowGet });
            }
            catch
            {    // no database entry
                return Json(new { Success = false, Message = "Error", JsonRequestBehavior.AllowGet });
            }
        }

        return RedirectToAction("Index");
    }
    return View(result);
}

插入QnA

function InsertQnA() {
    //hardcoded for testing
    Q1 = 10;
    Q2 = 10;
    Q3 = 10;
    Q4 = 10;
    Q5 = 10;
    Q6 = 10;
    Q7 = 10;
    Q8 = 10;
    Q9 = 10;
    Q10 = 10;
    localStorage.setItem("Total",100);
    localStorage.setItem("CaseStudy", 1);
    localStorage.setItem("UserId",1);
    Attempts = "1";
    ////////////////


    $.ajax({
        url: Domain + '/Result/Create',
        cache: false,
        type: 'POST',
        contentType: 'application/json; charset=utf-8',
        data: '{"Q1":"' + Q1 + '","Q2":"' + Q2 + '","Q3":"' + Q3 + '","Q4":"' + Q4 + '","Q5":"' + Q5 + '","Q6":"' + Q6 + '","Q7":"' + Q7 + '","Q8":"' + Q8 + '","Q9":"' + Q9 + '","Q10":"' + Q10 + '","Total":"' + localStorage.getItem("Total") + '","CaseStudy":"' + localStorage.getItem("CaseStudy") + '","UserId":"' + localStorage.getItem("UserId") + '","Attempts":"' + QnANumAttempts + '"}',
    //  dataType : "json",
        success: function (data) {
            alert(data.ResultId);

            if (data.Success==true) {
            }
            else if (data.Success==false) {
                viewModel.UserId("Your entry has not been saved, please try again.");
            }       
        },
    }).fail(
        function (xhr, textStatus, err) {
            console.log(xhr.statusText);
            console.log(textStatus);
            console.log(err);
        });
    }

---

问题是，我打算使用相同的ActionResult来提供MVC视图和htlm5 cordova iOS应用程序。我通过复制ActionResult来解决这个问题，但是将返回类型更改为字符串。注意，代码在操作中看起来有点不同，但是最初的操作也很好。非常感谢所有发帖的人

[HttpPost]
        public string CreateResult(Result result)
        {

            result.ResultDate = DateTime.Now;
            repository.InsertResult(result);
            repository.Save();

            if (result == null)
            {
                // User entity does not exist in db, return 0
                return JsonConvert.SerializeObject(0);
            }
            else
            {
                // Success return user
                return JsonConvert.SerializeObject(result, Formatting.Indented, new JsonSerializerSettings { PreserveReferencesHandling = PreserveReferencesHandling.Objects });
            }

        }

阿贾克斯

---

我刚看到你的if语句没有主体。这可能是造成问题的原因吗？如果你指的是html正文，为了简洁，我去掉了代码。不，我指的是两个花括号之间的代码，如ifstation{doSomething}是的，为了简洁，我也去掉了它，问题在于返回的数据是未定义的，即alertdata.ResultId，或者如果我使用alertdata.Success，它们都是未定义的？这听起来更像是服务器端的问题，因为ajax调用get是一个答案，否则它不会调用Success方法，但您的数据没有设置

$.ajax({
                 url: Domain + '/Result/CreateResult',
                 cache: false,
                 type: 'POST',
                 dataType: 'json',
                 contentType: 'application/json; charset=utf-8',
                 data: '{"Q1":"' + Q1 + '","Q2":"' + Q2 + '","Q3":"' + Q3 + '","Q4":"' + Q4 + '","Q5":"' + Q5 + '","Q6":"' + Q6 + '","Q7":"' + Q7 + '","Q8":"' + Q8 + '","Q9":"' + Q9 + '","Q10":"' + Q10 + '","Total":"' + localStorage.getItem("Total") + '","CaseStudy":"' + localStorage.getItem("CaseStudy") + '","UserId":"' + localStorage.getItem("UserId") + '","Attempts":"' + QnANumAttempts + '"}',
                 success: function (data) {

                 try {

                 if (data != 0) {

                 //result id used for feedback insertion > update result entity
                 localStorage.setItem("ResultId", data.ResultId);

                 viewModel.UserId("You have successfully completed case study " + localStorage.getItem("CaseStudy") + ", please fill out the <a href=evaluation.html target=_self>evaluation.<a/>");

                 //reset locals
                 ResetLocalStorage();

                 //count number of entities for User
                 CountUserEntitiesInResults();

                 }
                 else
                 {
                    viewModel.UserId("Your entry has not been saved, please try again.");
                 }
                 }catch(error) {
                 alert("This is the error which might be: "+error.message);
                 }
                 },
                 }).fail(
                         function (xhr, textStatus, err) {
                         console.log(xhr.statusText);
                         console.log(textStatus);
                         console.log(err);
                         });​