DataTables - Server-side ajax.params()

HTML

<script src="//cdn.datatables.net/1.10.6/js/jquery.dataTables.js"></script>
<link rel="stylesheet" href="//cdn.datatables.net/1.10.6/css/jquery.dataTables.css">
<link rel="stylesheet" href="https://cdn.datatables.net/scroller/1.2.2/css/dataTables.scroller.min.css">
<script src="https://cdn.datatables.net/scroller/1.2.2/js/dataTables.scroller.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-mockjax/1.6.2/jquery.mockjax.min.js"></script>
<h3>jQuery DataTables: Additional parameter</h3>
<a href="https://www.gyrocode.com/articles/tag/jquery-datatables/">See more articles about jQuery DataTables</a> on <a href="https://www.gyrocode.com/articles/">Gyrocode.com</a><hr>

<table id="example" class="display" cellspacing="0" width="100%">
    <thead>
        <tr>
            <th>ID</th>
            <th>Name</th>
        </tr>
    </thead>
</table>

<hr><a href="https://www.gyrocode.com/articles/tag/jquery-datatables/">See more articles about jQuery DataTables</a> on <a href="https://www.gyrocode.com/articles/">Gyrocode.com</a>

JavaScript

// FOR TESTING ONLY: AJAX emulation 
$.mockjax({
    url: '/test/0',
    responseTime: 200,
    response: function(settings){
        console.log("Request data: ", settings.data);
        
        var val = settings.data.start;
        this.responseText = {
            data: [],
            draw: settings.data.draw,
            recordsTotal: 1000,
            recordsFiltered: 1000,
            queryStatus:"This is a server extra field!!!"
        };
            
        for(var i = 0; i < settings.data.length; i++){
            this.responseText.data.push(["A" + (i + settings.data.start + 1), "data"]);
        }
    }
});

var table = $("#example").DataTable({
     "serverSide": true,
     "ajax": "/test/0"
 });

$("#example").on('xhr.dt', function (e, settings, json, xhr) {
   var return_data = json.queryStatus;
   alert(" return_data = " + return_data.toString());
});