DataTable can not pass parameters from Ajax to ASP.NET MVC controller - ajax

Question

I have this problem when trying to pass a string parameter from DataTable with Ajax to an ASP.NET MVC controller: the parameter is not being sent.
I tried many forms of "data:" options. Please help me, I think I'm missing something important.
When (as a test) I initialize the parameter at the beginning of the controller with ttt="CO" everything goes fine!
$('#tblVacation').DataTable({
"ajax": {
"url": '/Vacation/LoadData2',
"contentType": "application/json;charset=utf-8",
"type": 'GET',
"dataType": 'JSON',
"data" : ' { ttt: "CO" }'
"dataSrc": "",
},
"columns": [
{ "data": "vacationId", width: "5%" },
{ "data": "operatorId", width: "3%" },
{ "data": "operator", width: "10%" },
{ "data": "type", width: "3%" },
]
});
And the controller is:
[HttpGet]
public ActionResult LoadData2(string ttt)
// ttt="CO";
{
List<Vacation> data = null;
try
{
data = DB.Vacations.Include(x => x.Operator).ToList();
var result = data.Select(x => new Vacation_VM
{
VacationId = x.VacationId,
OperatorId = x.OperatorId,
Vacation_doc = x.Vacation_doc,
Operator = x.Operator.Name,
Type = x.Type,
}).Where(m => m.Type == ttt);
return new JsonResult(result);
}
catch (Exception ex)
{
ViewBag.Message = ex.Message;
}
return new JsonResult(null);
}
I also tried with
var entity = {
ttt: "CO"
}
var dataToSend = JSON.stringify(entity);
and
"data": function () {
return dataToSend;
},
but it's still not working. I will need in the future to pass multiple parameters.
Thanks a lot, I will appreciate any advice.

Answer 1

Replace the ajax call part with the followings:
"ajax": {
type: 'GET',
url: '/Vacation/LoadData2',
data: { ttt: "CO" },
dataType: 'JSON',
async: true,
cache: false,
},