$http post from angularjs to C# MVC view model, have correct List count but the values are null

Question

I have the following post request using $http

var registration = {
   userId: 23,
   groupings: [ 
           { Id: 1, Name: 'Test Group 1', Description: 'Yo' }, 
           { Id: 4, Name: 'Test Group 4', Description: 'Er' } 
]
}
$http({
            method: 'POST',
            url: url,
            headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
            data: $.param({
                code: eventCode,
                UserId: registration.userId
                Groupings: registration.groupings
            })
        })

And then on my action

    [HttpPost]
            public ActionResult New(string code, RegistrationVM model)
            {
    :
    :
    :
    }


    public class RegistrationVM  
        {
             public int UserId {get;set;}
             public IEnumerable<GroupingVM> Groupings { get; set; }
    }

public class GroupingVM{
   public int Id {get;set;}
   public string Name {get;set;}
   public string Description {get;set;}

   public int AnotherPropertyId {get;set;}
   public ANewClass ANewClass {get;set;}
}

Whenever the post happens, I would have the model properties reflect what I posted except the IEnumerable (Groupings) property. Let's say I post with 2 objects on the Groupings property, when I go to the Action, the Groupings property will have a count of 2 but every instance would have either NULL or 0 values on each object. I'm trying to figure out how I'm messing the post.

Shouldn't the params be: $.param({ code: eventCode, model: registration }) — Marcus Höglund
– Marcus Höglund, Commented Sep 22, 2016 at 13:11
Yeah I tried that, it didn't work.With that, everything is empty now except code. — gdubs
– gdubs, Commented Sep 22, 2016 at 13:21
Try and add the string code to the RegistrationVM class and use one parameter in the controller method. Also add the code to the registration object in the client and pass $.param({ model: registration }) — Marcus Höglund
– Marcus Höglund, Commented Sep 22, 2016 at 13:37
Tried it, moved the properties to the VM, had the same effect, the groupings would have the right count but it's still empty properties. Should I be filling up all properties with values? — gdubs
– gdubs, Commented Sep 22, 2016 at 13:52
data: JSON.stringify(registration).. Another option is to use a DTO just for this method that only includes the properties you need — Marcus Höglund
– Marcus Höglund, Commented Sep 22, 2016 at 14:01

Marcus Höglund · Accepted Answer · 2016-09-22 14:36:54Z

1

First, make the controller take one object as a parameter. Add the "string code" to the RegistrationVM and remove the string code as a parameter.

Then do the same when you create the client object.

Secondly, instead of using the content type "x-www-form-urlencoded" use the "application/json" which is better suited to pass objects.

Before posting the data you need to stringify the obj with data: JSON.stringify(registration)

For more details, read the comments on the question.

answered Sep 22, 2016 at 14:36

Marcus Höglund

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