please help me guys Hi I am trying this function and it works good in general but in my case I added some other filter for my datatable and my filter it works pretty good and I get the needed data but when I came to export (print, excel,..) my data showing in my datatable i get all of data I have in database but my objective is to export only filtred data displayed .

"dom": 'Blfrtip',
                    "buttons": [
                        {
                            "extend": 'excel',
                            "text": '<button class="btn"><i class="fa fa-file-excel-o" style="color: green;"></i>  Excel</button>',
                            "titleAttr": 'Excel',
                            "action": exportData
                        },

                    ],
my function :
function exportData(e, dt, button, config) {
    var self = this;
    dt.one('preXhr', function (e, s, data) {
        data.start = 0;
        data.length = 2147483647;
        dt.one('preDraw.dt', function (e, settings ) {
            if (button[0].className.indexOf('buttons-excel') >= 0) {
                $.fn.dataTable.ext.buttons.excelHtml5.available(dt, config) ?
                    $.fn.dataTable.ext.buttons.excelHtml5.action.call(self, e, dt, button, config) :
                    $.fn.dataTable.ext.buttons.excelFlash.action.call(self, e, dt, button, config);
            } else if (button[0].className.indexOf('buttons-pdf') >= 0) {
                $.fn.dataTable.ext.buttons.pdfHtml5.available(dt, config) ?
                    $.fn.dataTable.ext.buttons.pdfHtml5.action.call(self, e, dt, button, config) :
                    $.fn.dataTable.ext.buttons.pdfFlash.action.call(self, e, dt, button, config);
            } else if (button[0].className.indexOf('buttons-print') >= 0) {
                $.fn.dataTable.ext.buttons.print.action(e, dt, button, config);
            }
            return false;
        });
    });
    dt.ajax.reload(false);
}

What should I do ?