json ajax call returning success with 200 OK but goes to error with Invalid character

Question

my project is an MVC Web application I am using ajax call to get a huge list of data as JSON.

Here is the code( i am not sure what I a missing ):

  $.ajax({
            url: url, //server
            type: "POST",
            async: true,
            data: { id: id },
            dataType: "json",
            success: function (data) {
                debugger;
                jQuery.each(data, function (i, val) {

//Success code


            },
            error: function (xhr, ajaxOptions, thrownError) {
                console.log(xhr.status);
                console.log(thrownError);
                window.baseShowModalOkCancel("<p>Backlog Data</p>", "<p>Error in Database</p>", "ERROR");
            }
        });
    }

Action Controller:( This is a post method in return statement I can see the list of object with the data.

   [HttpPost]
    [OutputCache(NoStore = true, Duration = 0, VaryByParam = "*")]
    public ActionResult GetBacklogWithData(string id)
    {
        using (var db = new LiensTrackerEntities())
        {

            List<BackLogDataList> backLogData = new List<BackLogDataList>();
            List<BackLogData> backLog;

               backLog = db.BackLogDatas.OrderBy(x =>x.CaseNumber).ToList();
                foreach (var item in backLog)
                {
                    BackLogDataList backLogDataList = new BackLogDataList
                    {
                        FileNo = item.FileNo,
                        BackLogId = item.BackLogID,
                        FirstName = item.FirstName,
                        LastName = item.LastName,
                        Middle = item.Middle,
                        Suffix = item.Suffix,
                        Address = item.Address,
                        Address2 = item.Address2,
                        City = item.City,
                        St = item.ST,
                        Zip = item.SP1ZIP,                           
                        AmaesRecordCreatedDate = item.AMAESRecordCreatedDate != null ? item.AMAESRecordCreatedDate.ToString().Split(' ')[0] : null,
                        AddedInRecipient = item.AddedInRecipient
                    };
                    backLogData.Add(backLogDataList);
                }

            }



            return Json(backLogData, JsonRequestBehavior.AllowGet);
        }
    }

It returns with 200 ok but execute the error function when i look into console i found the following error:

@Shyju , the response body is coming as HTML page. which is directly hitting to error function. — Kotha, Dec 01 '17 at 19:18
@Hackerman. the ajax call response is directly hitting the error function. with 200 Result and error msg as: {description: "Invalid cha...", message: "Invalid cha...", name: "SyntaxError", number: -2146827274, stack: "SyntaxError..."} — Kotha, Dec 01 '17 at 19:19
That means your server code is crashing and the server app is returning the html for the error view.your code is going to the error handler because you mentioned the expected data type is json. and the $.ajax is trying to parse that respones (assuming it is json) and crashing (because it is actually HTML. So you need to fix your code so that it will not return HTML — Shyju, Dec 01 '17 at 19:30
Take a look at [this post](https://stackoverflow.com/questions/46531882/show-exception-message-to-client-side/46532062#46532062) which has solution to return a json response even in the case of an exception. — Shyju, Dec 01 '17 at 19:35
@Shyju thanks for the suggestion. But my code looks straightforward, can you suggest where to do, Appreciate your help... — Kotha, Dec 01 '17 at 19:35
@shyju Thanks, I found the error using your post. and fixed it. — Kotha, Dec 01 '17 at 19:53

score 0 · Accepted Answer · answered Dec 01 '17 at 19:52

0

Thee error is due to max json string length. the solution is

MaxJsonLength exception in ASP.NET MVC during JavaScriptSerializer

answered Dec 01 '17 at 19:52

Kotha

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json ajax call returning success with 200 OK but goes to error with Invalid character

1 Answers1