Question: I am using [Datatables](http://datatables.net) to display tabular data in my Web application, and have configured it to make use of [server-side processing](http://datatables.net/usage/server-side), i.e. query the server via AJAX for filtered data. I want to filter according to additional parameters that are specific to my application, i.e. corresponding to some user options (f.ex. via a checkbox in the UI). How do I make DataTables pass these additional filter parameters to the server?

Answer: 
The solution is to employ DataTables' [fnServerParams](http://datatables.net/usage/server-side) option, which allows you to add custom parameters to be sent in the XMLHttpRequest sent to the server. For example:

```
$(document).ready(function() {
  $('#example').dataTable({
    "bProcessing": true,
    "bServerSide": true,
    "sAjaxSource": "/IndexXhr",
    "fnServerParams": function (aoData) {
        var includeUsuallyIgnored = $("#include-checkbox").is(":checked");
        aoData.push({name: "includeUsuallyIgnored", value: includeUsuallyIgnored});
    }
  });
});

```
**This answer is updated for version 1.10.6** 

This is now can be done using the [ajax](http://datatables.net/reference/option/ajax) option. 

Sample code

```
 $table.dataTable({
            "ajax":  {
                "url": "example.com/GetData",
                "type": "POST",
                "data": function(d) {
                    d.Foo = "bar";
                    d.Bar = "foo";
                    d.FooBar = "foobarz";
                }
            },
            "serverSide":true,
        });

```

Foo, Bar and FooBar will be posted as Form Data as additional parameters along with other existing ones like *draw, start, length,* etc so depending on your server side language you can read them accordingly.

In a real life scenerio, you would probably have a Search button and some input, you can trigger the filtering process by calling 

```
        var table = $table.DataTable();
        table.ajax.reload(); 

```

when the button is clicked.