将列表和字符串数据从Ajax传递到MVC 4中的控制器，列表是否为NULL？

Question

Hi I'm new to JavaScript and MVC, and I'm trying to pass List and string to my controller.

JavaScript looks like:

 var parms = {
                  globalList: globalList,
                  fieldName: fieldName
              };
              $.ajax({
                  //contentType: 'application/json; charset=utf-8',
                  type: "POST",
                  traditional: true,
                  url: "/Home/SaveField",
                  async: false,
                  data: parms,
                  dataType: "json",
                  success: function (data) {
                      console.log("uspjeh");
                  },
                  error: function (errorData) {
                      console.log("errors");
                  }

              });
          });

and controller looks like:

public void SaveField(List<Point> globalList, String fieldName)
{
  // filedName is correctly passed
  // list is null
}

can somebody help me please?

Point class:

public class Point
{
  [Key]
  public int PointId { get; set; }
  public float GeoDuzina { get; set; }
  public float GeoSirina { get; set; }
  [ForeignKey("Data")]
  public int DataId { get; set; }
  public virtual Data Data { get; set; }
}

Answer 1

It wont work. If you debug a little then you will see that you post to server something like this:

globalList:[object Object]
globalList:[object Object]
globalList:[object Object]

It is just array of strings. But there is a way to do what you want. You can serialize your array to json and then deserialize it in your controller. Just change your param to:

var parms = {
    globalList: JSON.stringify(globalList),
    fieldName: fieldName
};

And action:

[HttpPost]
public void SaveField(string globalList, string fieldName)
{
    var serializer = new JavaScriptSerializer(); //use any serializer you want
    var list = serializer.Deserialize<List<Point>>(globalList);
}

Or you can make param object looks like from HTML form:

var parms = {
     "globalList[0].GeoDuzina": 51.506760996586294, 
     "globalList[0].GeoSirina": -0.06106463202740998,
     "globalList[1].GeoDuzina": 51.516269286402846, 
     "globalList[1].GeoSirina": -0.056258113472722464,
     "globalList[2].GeoDuzina": 51.50419662363912, 
     "globalList[2].GeoSirina": -0.044413478462956846,
     fieldName: fieldName
 };

It works with your action.

There are many other ways to do that. I just show two of them. Is any good for you?

btw. This numbers are too long for floats.;)