When transferring data to the controller in MVC via AJAX, the nested properties of JavaScript objects are found to be null

I have listed out the various entities present in my model.

 public class Provider
{
    public int ProviderId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string SSN { get; set; }
    public string NPI { get; set; }
    public ProviderDetails ProviderDetails { get; set; }

}

public class ProviderDetails
{
    public int ProviderDetailsId { get; set; }
    public string Certification { get; set; }
    public string Specialization { get; set; }
    public string TaxonomyCode { get; set; }
    public string ContactNumber { get; set; }
    public string ContactEmail { get; set; }
    public int ProviderId { get; set; }
}

Here is the controller action method that I am using.

 [HttpPost]
    public ActionResult CreateProvider(Provider provider)
    {
        try
        {
            int providerCreationResult = _repository.CreateProvider(provider);
            if (providerCreationResult == 1)
                TempData["userIntimation"] = "Provider Successfully Registered";

            return RedirectToAction("ShowTheListOfProviders");
        }
        catch (Exception Ex)
        {
            _logger.Error(Ex.Message);
            return View("Error");
        }
    }

Data is being sent to the controller via AJAX with the following script.

self.createProviderDetails = function () {
    $.ajax({
        url: "/Provider/CreateProvider/",
        type: "POST",
        data: fillModel(),
        async: false,
        success: function (result) {
            if (result.url) {
                location.href = result.url;
            }
        }
    }).fail(
             function (xhr, textStatus, err) {
                 alert(err);
             });
};

The function responsible for filling up the model is given below.

var fillModel = function () {
    var providerData =
        {
            ProviderId: self.providerID(),
            FirstName: self.firstName(),
            LastName: self.lastName(),
            SSN: self.SSN(),
            NPI: self.NPI(),
            ProviderDetails: {
                ProviderDetailsId: 0,
                Certification: self.certification(),
                Specialization: self.specialization(),
                TaxonomyCode: self.taxonomyCode(),
                ContactNumber: self.contactNumber(),
                ContactEmail: self.contactEmail(),
                ProviderId: self.providerID()          
            }   
        }
    return providerData;
}

While the object data seems fine on the Javascript side, the nested objects appear as null at the controller end.

I would appreciate any guidance on what might be going wrong here. I'm struggling to pinpoint this issue.

Answer №1

To ensure visibility of columns and properties in your model, make sure to pass the same names and properties into the model when passing it into the controller.

data: JSON.stringify({
     model: {
                 "Name": $("#Name").val(),
                 "Age": $("#Age").val(),
                 "Location": $("#Location").val(),
                 "Gender": $("#Gender").val(),
           }),

It is important to structure your model in this way to avoid any potential issues that may arise later on.

Answer №2

 function addProviderDetails() {
        $.ajax({
            url: "/Provider/Add/",
            type: "POST",
            data: getFormData(),
            async: false,
            dataType : "json",
            contentType: "application/json; charset=utf-8",
            success: function (response) {
                if (response.url) {
                    window.location.href = response.url;
                }
            }
        }).fail(
                 function (xhr, textStatus, error) {
                     alert(error);
                 });
    };

Answer №3

Make sure to set the dataType in your AJAX request to 'json':

self.createProviderDetails = function () {
    $.ajax({
        url: "/Provider/CreateProvider/",
        type: "POST",
        data: fillModel(),
        dataType: "json", // specify data type
        async: false,
        success: function (result) {
            if (result.url) {
                location.href = result.url;
            }
        }
    }).fail(
             function (xhr, textStatus, err) {
                 alert(err);
             });
};

Answer №4

Another common mistake to watch out for is using square brackets [] when building a nested object.

 var object = {
     NestedObject: [{ Column1: "value1" }], // This is an error
     NestedObject: { Column1: "value1" }, // This is correct
 }

It doesn't matter whether you use quotes for the column names and nested columns:

 var object = {
     "NestedObject": { "Column1": "value1" }, // This is correct
 }

When working with your object in the controller, make sure to specify the datatype as JSON.

 $.ajax({
    url: "/Provider/CreateProvider/",
    type: "POST",
    data: fillModel(),
    dataType: "json", // Specify the data type as JSON
    success: function (result) {

    }
})

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