I had the same question, and could only find this which says the object isn't public:
https://datatables.net/forums/discussion/25470
However, you can mimic the functionality, the below was written for DataTables 1.10.18:
//This function returns the ajax post object datatables generates automatically on refresh
function GetDataTablePost(dt) {
//Originally Sourced from: https://datatables.net/forums/discussion/21940/how-to-pass-new-post-parameters-on-ajax-reload
//Modified heavily to make something postable.
var settings = $(dt).dataTable().fnSettings();
var obj = {
//default params
"draw": settings.iDraw,
"start": settings._iDisplayStart,
"length": settings._iDisplayLength
};
//columns
for (var index in settings.aoColumns) {
obj['columns[' + index + '][data]'] = settings.aoColumns[index].data;
//Strictly speaking, this should be settings.aoColumns[index].name, however, using the th value because it's more relevant on a server post.
obj['columns[' + index + '][name]'] = settings.aoColumns[index].sTitle.trim();
obj['columns[' + index + '][searchable]'] = settings.aoColumns[index].bSearchable;
obj['columns[' + index + '][orderable]'] = settings.aoColumns[index].bSortable;
obj['columns[' + index + '][search]'] = null; //TODO: Populate this correctly.
}
//sort
for (var index in settings.aLastSort) {
obj['order[' + index + '][column]'] = settings.aLastSort[index].col;
obj['order[' + index + '][dir]'] = settings.aLastSort[index].dir;
};
obj['search[value]'] = settings.oPreviousSearch[settings.oPreviousSearch._hungarianMap['search']];
obj['search[regex]'] = settings.oPreviousSearch[settings.oPreviousSearch._hungarianMap['regex']];
settings.ajax.data(obj);
//Not part of the normal object, add the ajax url for convenience.
obj['url'] = settings.ajax.url;
return obj;
}
//This function performs a post containing the parameters in obj.
function doPost(postUrl, obj) {
//Inspired by: https://stackoverflow.com/questions/1350917/send-post-variable-with-javascript
var submitMe = document.createElement("form");
submitMe.action = postUrl;
submitMe.method = "post";
submitMe.enctype = "multipart/form-data";
for (var index in obj) {
var submitMeInput = document.createElement('INPUT');
submitMeInput.name = index;
submitMeInput.setAttribute('value', obj[index]);
submitMe.append(submitMeInput);
}
$(submitMe).hide();
document.body.append(submitMe);
submitMe.submit();
document.body.removeChild(submitMe);
}
To use, my buttons action object is:
action: function (e, dt, node, config) {
var obj = GetDataTablePost(dt.context[0].oInstance);
obj.cmd = "Do more stuff!";
doPost(obj.url, obj);
}
On the server side, I retrieve the parameters with this:
public ActionResult _PopulateDataTable(string cmd, int draw, int start, int length, Dictionary<string, Dictionary<string, string>> columns, Dictionary<string, Dictionary<string, string>> order, Dictionary<string, string> search) {
int recordsTotal, recordsFiltered;
var data = applicationData.RunQuery(start, length, columns[order["0"]["column"]]["data"], order["0"]["dir"], search["value"], out recordsTotal, out recordsFiltered);
return Json(new { draw = draw, recordsFiltered = recordsFiltered, recordsTotal = recordsTotal, data = data });
}
