Datatable Tricks

=> In datatable redirect baseurl when session is expired:
  
- In datable.js file write following code: 
"data": function (d) {
                $.getJSON('contacts/ajaxData',myData, function (json) {
                    if (json.expired == '1') {
                        window.location = BASE_URL;
                    }
                });
                return  $.extend(d, myData);
            },
   In, $.getJSON you have to pass controller name/method name (ex. contacts/ajaxData)

- In controller write following code:
if ($this->input->is_ajax_request()){
                echo json_encode(array("expired" => "1"));exit;
            }

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