I am attempting to create a click event for an button that is not part of the Kendo UI Grid controls.
This was fairly easily accomplished with this code: https://stackoverflow.com/a/20973015/60629
Working DataSourceRequest Code:
JavaScript
$("#excel").kendoButton({
  click: function (event) {
    var grid = $('#grid_patients').data('kendoGrid');
        var parameterMap = grid.dataSource.transport.parameterMap;
        var sortData = grid.dataSource.sort();
        var filterData = grid.dataSource.filter();
        var groupData = grid.dataSource.group();
        var prepared = parameterMap({ sort: sortData, filter: filterData, group: groupData });
    $.post("/Root/Getresults", prepared, 
       function (data, status, xhr) {
         console.log("Ok!");
       }
    );
  }
});
Controller Code
public ActionResult Getresults([DataSourceRequest]DataSourceRequest request)
{
    ...
Additional Data
However, I need to also pass additional parameters. JavaScript Changes
 var extraParams = { /* appended data object */
     request: prepared,
     additionaldata: "test"
 };
 $.post("/Root/Getresults", extraParams, 
  ...
Controller
public ActionResult Getresults([DataSourceRequest]DataSourceRequest request, string additionaldata)
{
    ...
The original returns the DataSourceRequest with data and the secondary one will return the additionaldata, but has an empty request object.
I'm unsure how to proceed from here.