Javascript AJAX调用中返回的JSON无效_Javascript_Jquery_Ajax_Json_Cordova

Javascript AJAX调用中返回的JSON无效

javascript jquery ajax json cordova

Javascript AJAX调用中返回的JSON无效,javascript,jquery,ajax,json,cordova,Javascript,Jquery,Ajax,Json,Cordova,我试图通过向AJAX调用发送新插入的ID和JSON变量来检测数据库条目是否已成功输入，但它在phonegAP中不起作用，但在所有浏览器中都可以，我可以看到数据已成功插入数据库。感谢所有评论/帮助，谢谢。 AJAX代码- function InsertQnA() { $.ajax({ url: Domain + '/Result/Create', cache: false, typ

我试图通过向AJAX调用发送新插入的ID和JSON变量来检测数据库条目是否已成功输入，但它在phonegAP中不起作用，但在所有浏览器中都可以，我可以看到数据已成功插入数据库。感谢所有评论/帮助，谢谢。 AJAX代码-

function InsertQnA() {

          $.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", Total) + '","CaseStudy":"' + localStorage.getItem("CaseStudy") + '","UserId":"' + localStorage.getItem("UserId") + '","Attempts":"' + QnANumAttempts + '"}',
              success: function (data) {

                 alert('this alert is invoked successfully');

                  if (data.Success == true) {

                    alert('this alert is not being invoked successfully');

                      //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>");

                  }
                  else if (data.Success==false)
                  {
                 alert('this alert is not being invoked either');
                      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);
                       });

      }

发现代码存在两个问题：

localStorage.getItem（“总计”，总计）

应为

localStorage.getItem（“总计”）

数据类型：“json”

未明确提及

我已经发布了相关的更正。如果有帮助的话，试试这个，如果你有任何错误，也和大家分享

function InsertQnA() {
   $.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('this alert is invoked successfully');

             try {

              if (data.Success == true) {

                alert('this alert is not being invoked successfully');

                  //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>");

              }
              else if (data.Success==false)
              {
             alert('this alert is not being invoked either');
                  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);
                   });

  }

从我（在过去两天中）收集的信息来看，MVC ActionResult似乎并不容易为Web应用程序提供数据。我通过使用string方法复制ActionResult解决了这个问题，现在它运行良好。可能不是最好的解决方案，但我听说在为web视图和web应用提供服务时，最好创建两种操作方法，而不是一种。非常感谢所有发帖的人

MVC行动-

  [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-

 $.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);
                         });

$.ajax({
url:Domain+'/Result/CreateResult',，
cache:false，
键入：“POST”，
数据类型：“json”，
contentType:'application/json；charset=utf-8'，
“Q3:“，，”Q3:““““，，”，”Q3““““““，，”，”Q3““““，，”，”Q3““，，”，”Q4“““，，”Q4“““““，，，”Q5““““““““““““““““““““““““““，，”Q7““““““““：””””””，，“Q8““““““““““，，”Q9““““““：””””””””““““““““““““““““；””””””””””””””””””””””、、、，”Q9:“““““““““““““““““““““““““““““““““““““““““““““““““““““，“尝试”：“'+QnANumAttempts+'”}”，
成功：功能（数据）{
试一试{
如果（数据！=0）{
//用于反馈插入>更新结果实体的结果id
setItem（“ResultId”，data.ResultId）；
UserId（“您已成功完成案例研究”+localStorage.getItem（“案例研究”）+”，请填写评估表。”）；
//重置局部变量
ResetLocalStorage（）；
//计算用户的实体数
CountUserEntitiesInResults（）；
}
其他的
{
UserId（“您的条目尚未保存，请重试。”）；
}
}捕获（错误）{
警报（“这是一个错误，可能是：“+error.message”）；
}
},
}).失败(
函数（xhr、textStatus、err）{
console.log（xhr.statusText）；
console.log（textStatus）；
控制台日志（err）；
});

您可能需要检查“数据”“从服务器返回。在iOS中，您可以轻松地将safari连接到iPhone模拟器。。对于android，您可以将console.log与eclipseAmitesh一起使用，我正在iPad上进行测试，我将如何进行测试？您可以在调试时从xcode中选择iPhone/iPad模拟器。应用程序启动后，您可以打开safari-->开发-->iPhone/iPad模拟器。之后，它将与safari中的调试相同。有关详细信息和实际设备调试，您可以访问，这有点帮助，谢谢。嗨，Surajit，我尝试添加数据类型：“json”，但这破坏了整个功能，即我没有收到任何警报。另一件事是+error.message。也破坏了函数。我已经编辑了上面的代码<代码>错误。消息是正确的。前一条在

错误的末尾有一个点（.）。消息

谢谢。如果（data.Success==true）只有警报（“此警报已成功调用”），则现在不会触发此行；和警报（“此警报也未被调用”）；我不确定我是否应该将ActionResult更改为返回内容而不是JSon？添加此行

alert（data）在警报之后（“此警报已成功调用”）查看您得到了什么。似乎没有从您从ajax调用的url接收到任何数据。我已通过一些服务器端更改编辑了我的答案。
  [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 });
            }

        }

 $.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);
                         });