javascript - Passing data in ajax post issue

Question

Scenario :

Need to pass an object which contains a list of sub objects to the controller.

Issue :

I'm able to get the object's value but not the value of list of sub objects inside the object.

Code :

index.cshtml

function sendData() {
    var student = {
        Id: 1,
        Name: "xxx",
        Marks: [{
            Subject: "Maths",
            Mark:80
        },
        {
            Subject: "Science",
            Mark: 75
        }]
    }
    $.ajax({
        url: '@Url.Action("Receive", "Home")',
        data: student,
        success: function (data) {
            alert("done");
        },
        error: function (error) {
            alert('error For details refer console log');
            console.log(error);
        }
    });
}

HomeController.cs

public ActionResult Receive(Student student)
    {
        ViewBag.Message = "Your contact page.";
        return View();
    }

Student.cs

public class Student
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<Marks> Marks { get; set; }
}
public class Marks
{
    public string Subject { get; set; }
    public decimal Mark { get; set; }
}

Screenshot:

Chrome debugger shows all the data were set.

but in controller i'm not getting the value of Marks

Any help would be appreciated. Thank you.

Answer 1

You need to stringify the data, and set the contentType and type ajax options (note that it needs to be a POST, otherwise you need to generate your data in a different way using fully qualified property names with dot notation - for example { Id: 1, .... , 'Marks[0].Subject': 'Maths', 'Marks[0].Mark': 80, ... }, in which case its your existing ajax code will work without modification)

var student = {
    ....
};

$.ajax({
    url: '@Url.Action("Receive", "Home")',
    data: JSON.stringify({ student: student }, // stringify
    type: 'POST', // add
    contentType: "application/json; charset=utf-8", //add
    success: function (data) {
        alert("done");
    },
    ....
});

Note that you method is returning a view, but you not doing anything with that view. If your intention is to update the DOM with that view, then the method should be return PartialView( ... ); and in the ajax success callback,

success: function (data) {
    $(someElement).html(data);
},