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Having trouble passing complex model to controller through ajax call

I'm trying to update my model whenever a button is clicked. When I log the data I'm sending in the razor file to the console, the data is all there. However, when the controller method is called, the model is empty.
My onclick method:
function addCoupon() {
var code = document.getElementById("coupon-entry").value;
$.ajax({ // Validate coupon first. This is working.
method: "post",
url: `/cart/validate-coupon/` + code,
contentType: "application/json; charset=utf-8"
}).done(result => {
if (result.success) {
var model = #Html.Raw(Json.Serialize(Model));
console.log(model); // Countries and CheckoutData are correct here
$.ajax({
method: "post",
url: `/cart/add-coupon/` + code,
contentType: "application/json; charset=utf-8",
data: model
}).done(result => {
console.log("It worked");
});
}
});
}
My model:
public bool IsPos { get; set; }
public List<CountryDto> Countries { get; set; }
public CheckoutData CheckoutData { get; set; }
public string Payment ProcessorError { get; set; }
public bool DisplayRequiredErrors { get; set; }
public List<string> ValidationErrors { get; set; } = new List<string>();
public PaymentInformationModel PaymentInformation { get; set; } = new PaymentInformationModel();
public bool UseSavedCard { get; set; }
My controller:
[HttpPost("add-coupon/{code}")]
public async Task<IActionResult> AddCouponAsync(string code, CheckoutModel model)
{
// Countries and CheckoutData are null here
}
There were several similar questions posted on here, but they all either had simple models, or had solutions that didn't work for me when I tried them.
Thanks!

You should try changing it to this (otherwise it isn't valid javascript):
(Notice that it needs to be encapsulated in '')
var model = '#Html.Raw(Json.Serialize(Model))';

how to pass variable to property of model in mvc

I have a Model as below:
public class Class1
{
public int Id { get; set; }
public DateTime Start { get; set; }
}
and I have an ActionResult which is like this:
public ActionResult Create(Class1 model)
{
...
}
now, I want to fill Start property from another external javascript file using ajax like this:
$.ajax({
url: "/Admin/Create",
dataType: "Json",
type: "Post",
data: Start:"..."
});
How can I access to another View TextBox and fill that using ajax? What should I do in data on ajax?

Please try below code:-
var model = { Name :"Shyju",
Location:"Detroit",
Interests : ["Code","Coffee","Stackoverflow"]
};
$.ajax({
type: "POST",
data: JSON.stringify(model),
url: url,
contentType: "application/json"
}).done(function (res) {
$("#SomeDivToShowTheResult").html(res);
});
public class DashboardViewModel
{
public string Name {set;get;}
public string Location {set;get;}
public List<string> Interests {set;get;}
}
[HttpPost]
public PartialViewResult IndexPartial([FromBody] DashboardViewModel m)
{
return PartialView("_IndexPartial",m);
}

Passing JSON to a Controller with Multiple Models and/or Parameters via AJAX POST

I wrote this Controller:
[HttpPost]
public JsonResult CheckOut(List<POS_model> pos, double totalPayment)
{
try
{
var json = JsonConvert.SerializeObject(pos);
DataTable posTable = (DataTable)JsonConvert.DeserializeObject(json, (typeof(DataTable)));
posTable.Columns["discount_percent"].ColumnName = #"Discount %";
POS m_pos = new POS();
m_pos.Data = posTable;
m_pos.totalPayment = totalPayment;
m_pos.CheckOut();
return Json(new
{
Status = "Success"
});
}
catch
{
return Json(new
{
Status = "Fail"
});
}
}
And i attempted wrote this AJAX script to call and submit the parameters to the Controller:(but it didn't work)
var totalPay = 1000;
var GatherPosItems = $('#tblPOS').tableToJSON();
$.ajax({
type: 'POST',
data: JSON.stringify(GatherPosItems)+"&totalPayment="+totalPay,
url: '#Url.Action("CheckOut", "POS")',
dataType: "json",
contentType: 'application/json; charset=utf-8',
success: function (data) {
alert('Success');
},
error: function (req, status, errorObj) {
alert(errorObj.toString());
}
});
The GatherPosItems is a JSON with multiple "Rows" or Objects, so it's an array.
I added a parameter totalPayment.
How can i pass Both GatherPosItems and totalPayment to the Controller?
my Model:
public class POS_model
{
public string Qty { get; set; }
public string description { get; set; }
public string price { get; set; }
public string discount_percent { get; set; }
public string Discount_amount { get; set; }
public string Discounted_price { get; set; }
public string Line_total { get; set; }
public string is_vat { get; set; }
public string track_type { get; set; }
public string item_line_id { get; set; }
public string id { get; set; }
public string sale_code { get; set; }
public string reference { get; set; }
public string unit_of_measure { get; set; }
public string location { get; set; }
public string item_code { get; set; }
}
My GatherPosItems's RESULT:

You concatenate a non-JSON string (&totalPayment="+totalPay) to the JSON returned from JSON.stringify function, which corrupts the format of data being sent to the server and makes the model binder unable to parse it.
The following should work:
$.ajax({
type: 'POST',
data: JSON.stringify({pos: GatherPosItems, totalPayment: totalPay}),
url: '#Url.Action("CheckOut", "POS")',
dataType: "json",
contentType: 'application/json; charset=utf-8',
success: function(data) {
alert('Success');
},
error: function(req, status, errorObj) {
alert(errorObj.toString());
}
});

Sending LIst<t> via ajax to complex model

I know I've done this before but I can't seem to get this to work.
I have the following JavaScript;
$("#btnTestVouchers").click(function () {
var postData = {
"workplaceGiverId": $(".wpgDropdownList").val(),
"fromMemberId": $(".wpgFromMemberDropdownList").val(),
"toMemberId": $(".wpgToMemberDropdownList").val(),
"voucherExpiryDate": $("#expiryDatePicker").val(),
"recipients": JSON.stringify("[{'firstname':'a','lastname':'b','email':'c','voucheramount':'d'}]")
};
console.log(postData);
$.ajax({
type: "POST",
url: "/Admin/TestVoucherCreationEmails",
contentType: 'application/json; charset=utf-8',
dataType: "json",
data: JSON.stringify(postData),
success: function (d) {
alert("OK");
},
error: function (xhr, textStatus, errorThrown) {
alert("Error:" + errorThrown);
}
});
});
In my model I have;
public class postDataObject
{
public int workplaceGiverId { get; set; }
public int fromMemberId { get; set; }
public int toMemberId { get; set; }
public string voucherExpiryDate { get; set; }
public IEnumerable<BulkVoucherRecipient> recipients { get; set; }
}
public class BulkVoucherRecipient
{
public string firstname { get; set; }
public string lastname { get; set; }
public string email { get; set; }
public string voucheramount { get; set; }
}
In my controller I have;
[HttpPost]
public void TestVoucherCreationEmails(postDataObject postedData)
{
string g = "";
}
However when I post, the list of recipients is always empty.
If I don't Stringify the list of recipients I get the same result.
Anyone know what I'm doing wrong?
edit
The other values all come through ok, just the List is empty.

You don't need to JSON.stringify the recipients.
"recipients": JSON.stringify("[{'firstname':'a','lastname':'b','email':'c','voucheramount':'d'}]")
Remove JSON.stringify form here and it should work.
var postData = {
"workplaceGiverId": $(".wpgDropdownList").val(),
"fromMemberId": $(".wpgFromMemberDropdownList").val(),
"toMemberId": $(".wpgToMemberDropdownList").val(),
"voucherExpiryDate": $("#expiryDatePicker").val(),
"recipients": [{'firstname':'a','lastname':'b','email':'c','voucheramount':'d'}]
};

Try this, It should work
[HttpPost]
public void TestVoucherCreationEmails([FromBody]postDataObject postedData)
{
string g = "";
}

Ajax not receiving complete JsonResult

Background:
In the view, we ask (via jquery and ajax) the controller for data from the database. The data is returned as Json, but for reasons unknown one part of the Json object is returned as null, even though it is properly set in the controller's JsonResult.
The Code:
The class to be returned as JsonResult
public class InData
{
public InData() { }
public AppsWithActions[] apps { get; set; }
public User[] users { get; set; }
public string timePeriod { get; set; }
public string startDate { get; set; }
public string endDate { get; set; }
public string dataType { get; set; }
}
The Problem is the string arrays actionIds and actionNames in the following class are null in the javascript, even though they have the correct values in the JsonResult:
public class AppsWithActions
{
public AppsWithActions() { }
public string id { get; set; }
public string name { get; set; }
public string[] actionIds { get; set; }
public string[] actionNames { get; set; }
}
The controller function that sets the InData and returns it to the javascript:
//Takes a goal setting, turns it to indata and returns a JsonResult
public JsonResult GetIndataFromGoalSettingId(SettingId settingId)
{
var id = ToGuid(settingId.idString);
GoalSetting setting = Session.Query<GoalSetting>()
.Where(x => x.Id == id)
.FirstOrDefault();
var indata = TransformGoalSettingToInData(setting);
return Json(new { returnvalue = indata }, JsonRequestBehavior.AllowGet);
}
The ajax call that returns everything correct, except the apps.actionIds and apps.actionNames
function getIndataFromGoalSettingId(settingId) {
if (settingId != null) {
settingIdIn = { "idString": settingId};
$.ajax({
type: "POST",
async: false,
traditional: true,
url: 'GetIndataFromGoalSettingId',
data: JSON.stringify(settingIdIn),
dataType: "json",
contentType: "application/json; charset=utf-8",
success: function (result) {
//...
}
});
}
}
It should be said that we have successfully used the same kind of infrastructure for getting data and returning it as Json to the javascript before, but if anyone has a better suggestion feel free to spell it out!