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Asked: 2026-06-06T08:15:06+00:00

I have a knockout model that is feeding my page and on a save

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I have a knockout model that is feeding my page and on a save the following code is executed client side.

self.save = function() {
    var tirerun = ko.mapping.toJSON(self.data());
    $.ajax({
        type: 'post',
        url: "@Url.Action("SaveTireRunModel", "Events")",
        data: tirerun,
        success: function(result) {
            if (!result.success) {
                alert(result.error);
            } else {}
        }
    });
};

It then posts the following JSON to my server (From fiddler and cropped for brevity)
enter image description here

With the following http request header

POST http://localhost:63648/Events/SaveTireRunModel HTTP/1.1
Host: localhost:63648
Connection: keep-alive
Content-Length: 1975
Origin: http://localhost:63648
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.5 (KHTML, like Gecko)         Chrome/19.0.1084.56 Safari/536.5
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Accept: */*
Referer: http://localhost:63648/Events/OutingDetails?outingID=010fd8a1-e3a5-e111-a660-f0def1589f4b
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: jstree_open=%232012%2C%23c914324c-4d9f-e111-a79b-0024e8a037d3%2C%23eb-e957-e111-9e70-d067e53b2ed6%2C%234d-c00e-e111-ad1c-0e6e17349d3e%2C%2357-c00e-e111-ad1c-0e6e17349d3e%2C%234d-c00e-e111-ad1c-0e6e17349d3e; jstree_load=; .ASPXAUTH=054DD21DC0A17DDDAAFC254500ED8D6B3299EAABF1FB647732618E956EF082880BBA0B52A59849D3362AA03EB1F27D28867B07CD8451E4E983D84365608AA145F8DF8D71C2481639E110EC31325EE27EA3281FA2EDB7AD31A744D2A9918BE6599DB97E489ED4598D2DF63C31E36E809A282CF96FFCE5ACAEF8308FEA3DF1C6DE50B2AA7299F9D9AF0C30CE867DCCA352; jstree_open=%232012%2C%233dcc4b9b-37a3-e111-a6d3-0026b99ca1da%2C%23eb-e957-e111-9e70-d067e53b2ed6%2C%2357-c00e-e111-ad1c-0e6e17349d3e%2C%23a2962e1b-45a5-e111-b9ac-f0def1589f4b; jstree_load=%2311a4611a-8851-e111-95c7-60d819fcced5%2C%23b89422a0-0d03-e011-99cb-d601d71f0fcf; jstree_select=%23010fd8a1-e3a5-e111-a660-f0def1589f4b

{"Comments":"RSTA Dwn 2 Holes (6)\r\nRF Spring to 35468\r\nCross Dwn to 47.9 (-0.2)","TireSetsList":[{"ID":"1","Value":"1"},{"ID":"2","Value":"2"},{"ID":"3","Value":"3"},{"ID":"4","Value":"4"},{"ID":"5","Value":"5"}],"LFShoulderTemp":245,"RFShoulderTemp":245,"LFOuterTemp":177,"LFMiddleTemp":null,"LFInnerTemp":200,"RFOuterTemp":177,"RFMiddleTemp":null,"RFInnerTemp":200,"LROuterTemp":177,"LRMiddleTemp":null,"LRInnerTemp":200,"RROuterTemp":177,"RRMiddleTemp":null,"RRInnerTemp":200,"LFInitialOuterWear":null,"LFInitialOuterMiddleWear":null,"LFInitialMiddleWear":null,"LFInitialInnerMiddleWear":null,"LFInitialInnerWear":null,"LFAfterOuterWear":null,"LFAfterOuterMiddleWear":null,"LFAfterMiddleWear":200,"LFAfterInnerMiddleWear":null,"LFAfterInnerWear":null,"RFInitialOuterWear":null,"RFInitialOuterMiddleWear":null,"RFInitialMiddleWear":null,"RFInitialInnerMiddleWear":null,"RFInitialInnerWear":null,"RFAfterOuterWear":null,"RFAfterOuterMiddleWear":null,"RFAfterMiddleWear":200,"RFAfterInnerMiddleWear":null,"RFAfterInnerWear":null,"LRInitialOuterWear":null,"LRInitialOuterMiddleWear":null,"LRInitialMiddleWear":null,"LRInitialInnerMiddleWear":null,"LRInitialInnerWear":null,"LRAfterOuterWear":null,"LRAfterOuterMiddleWear":null,"LRAfterMiddleWear":200,"LRAfterInnerMiddleWear":null,"LRAfterInnerWear":null,"RRInitialOuterWear":null,"RRInitialOuterMiddleWear":null,"RRInitialMiddleWear":null,"RRInitialInnerMiddleWear":null,"RRInitialInnerWear":null,"RRAfterOuterWear":null,"RRAfterOuterMiddleWear":null,"RRAfterMiddleWear":200,"RRAfterInnerMiddleWear":null,"RRAfterInnerWear":null,"LFInnerColdPressure":71,"LFInnerHotPressure":null,"RFInnerColdPressure":71,"RFInnerHotPressure":null,"LRInnerColdPressure":71,"LRInnerHotPressure":null,"RRInnerColdPressure":71,"RRInnerHotPressure":null,"LFColdPressure":61.5,"LFHotPressure":69.8,"RFColdPressure":61.5,"RFHotPressure":69.8,"LRColdPressure":61.5,"LRHotPressure":69.8,"RRColdPressure":61.5,"RRHotPressure":69.8,"TrackTemp":133}

But when it goes into my action the model is completely null.

public JsonResult SaveTireRunModel(TireRunViewModel tirerun)
{
    tirerun.Save();
    return Json(new { success = true });
}

My model class is as follows

public class TireRunViewModel
{

    public TireRunViewModel()
    {

    }

    public TireRunViewModel(Guid outingID)
    {
        //data access crud here
    }

    public string Comments { get; set; }

    public List<SelectBoxModel> TireSetsList { get; set; }

    public double? LFShoulderTemp { get; set; }

    public double? RFShoulderTemp { get; set; }

    public double? LFOuterTemp { get; set; }

    public double? LFMiddleTemp { get; set; }

    public double? LFInnerTemp { get; set; }

    public double? RFOuterTemp { get; set; }

    public double? RFMiddleTemp { get; set; }

    public double? RFInnerTemp { get; set; }

    public double? LROuterTemp { get; set; }

    public double? LRMiddleTemp { get; set; }

    public double? LRInnerTemp { get; set; }

    public double? RROuterTemp { get; set; }

    public double? RRMiddleTemp { get; set; }

    public double? RRInnerTemp { get; set; }

    public double? LFInitialOuterWear { get; set; }

    public double? LFInitialOuterMiddleWear { get; set; }

    public double? LFInitialMiddleWear { get; set; }

    public double? LFInitialInnerMiddleWear { get; set; }

    public double? LFInitialInnerWear { get; set; }

    public double? LFAfterOuterWear { get; set; }

    public double? LFAfterOuterMiddleWear { get; set; }

    public double? LFAfterMiddleWear { get; set; }

    public double? LFAfterInnerMiddleWear { get; set; }

    public double? LFAfterInnerWear { get; set; }

    public double? RFInitialOuterWear { get; set; }

    public double? RFInitialOuterMiddleWear { get; set; }

    public double? RFInitialMiddleWear { get; set; }

    public double? RFInitialInnerMiddleWear { get; set; }

    public double? RFInitialInnerWear { get; set; }

    public double? RFAfterOuterWear { get; set; }

    public double? RFAfterOuterMiddleWear { get; set; }

    public double? RFAfterMiddleWear { get; set; }

    public double? RFAfterInnerMiddleWear { get; set; }

    public double? RFAfterInnerWear { get; set; }

    public double? LRInitialOuterWear { get; set; }

    public double? LRInitialOuterMiddleWear { get; set; }

    public double? LRInitialMiddleWear { get; set; }

    public double? LRInitialInnerMiddleWear { get; set; }

    public double? LRInitialInnerWear { get; set; }

    public double? LRAfterOuterWear { get; set; }

    public double? LRAfterOuterMiddleWear { get; set; }

    public double? LRAfterMiddleWear { get; set; }

    public double? LRAfterInnerMiddleWear { get; set; }

    public double? LRAfterInnerWear { get; set; }

    public double? RRInitialOuterWear { get; set; }

    public double? RRInitialOuterMiddleWear { get; set; }

    public double? RRInitialMiddleWear { get; set; }

    public double? RRInitialInnerMiddleWear { get; set; }

    public double? RRInitialInnerWear { get; set; }

    public double? RRAfterOuterWear { get; set; }

    public double? RRAfterOuterMiddleWear { get; set; }

    public double? RRAfterMiddleWear { get; set; }

    public double? RRAfterInnerMiddleWear { get; set; }

    public double? RRAfterInnerWear { get; set; }

    public double? LFInnerColdPressure { get; set; }

    public double? LFInnerHotPressure { get; set; }

    public double? RFInnerColdPressure { get; set; }

    public double? RFInnerHotPressure { get; set; }

    public double? LRInnerColdPressure { get; set; }

    public double? LRInnerHotPressure { get; set; }

    public double? RRInnerColdPressure { get; set; }

    public double? RRInnerHotPressure { get; set; }

    public double? LFColdPressure { get; set; }

    public double? LFHotPressure { get; set; }

    public double? RFColdPressure { get; set; }

    public double? RFHotPressure { get; set; }

    public double? LRColdPressure { get; set; }

    public double? LRHotPressure { get; set; }

    public double? RRColdPressure { get; set; }

    public double? RRHotPressure { get; set; }

    public int? SetNumberLF { get; set; }

    public int? SetNumberRF  { get; set; }

    public int? SetNumberLR { get; set; }

    public int? SetNumberRR { get; set; }

    public double? TrackTemp { get; set; }

    public void Save()
    {
       //data access crud here
    }
}

What can I do to further troubleshoot this and figure out why my model isn’t binding?

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1 Answer

  1. Editorial Team

    The default contentType for the $.ajax method is 'application/x-www-form-urlencoded'

    If you want to send JSON you have to specify that your are sending JSON otherwise the Model Binder won’t work correctly:

    $.ajax({
        type: 'post',
        url: "@Url.Action("SaveTireRunModel", "Events")",
        data: tirerun,
        contentType: 'application/json',
        success: function(result) {
            if (!result.success) {
                alert(result.error);
            } else {}
        }
    });

    You maybe also need to “stringify” the data with : data: JSON.stringify(tirerun)

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