Data table footer is not included in DataTable print export option - datatables

Question

I am using a Codeigniter and ajax request with DataTable to fetch data and trying to print the data using DataTable print export option. But footer is not appearing in the print.
How can i include the footer in printing with DataTable?
Here is my code:
function data_table_report(dateselected){
$("#dataTables-report").dataTable().fnDestroy();
table = $('#dataTables-report').DataTable({
"ajax": {
"url": "<?php echo site_url('patients_report/dataTable_report/')?>"+dateselected,
"type": "POST",
},
responsive: true,
bInfo: false,
dom: 'Bfrtip',
buttons: [{ extend: 'print',
exportOptions: {
columns: ':visible'
}
},
'colvis'],
columnDefs: [ {
targets: -1,
visible: false}
]
});
}

Answer 1

Add this:
buttons: [{ extend: 'print', footer: true }]

Answer 2

Add footer property as shown below
buttons: [{ extend: 'print',
footer: true,
exportOptions: {
columns: ':visible'
}
}]

Answer 3

Try this:
"fnInitComplete": function (oSettings, json) {
myfooter = this.find('tfoot')[0].innerHTML;
new $.fn.dataTable.Buttons( this, {
buttons: [
{
extend: 'print',
exportOptions : {
columns: ':not(.notForPrint)'
},
customize: function ( win ) {
$(win.document.body)
.css( 'font-size','10pt')
.css( 'font-family','arial');
$(win.document.body).find( 'table' )
.addClass( 'compact' )
.css( 'font-size', 'inherit' );
$(win.document.body).find('tfoot')[0].innerHTML = myfooter ;
win.print();
setTimeout(win.close(),500);
}
}
]
});
this.DataTable().buttons().container().insertBefore( '#example_filter');
},