//https://datatables.net/release-datatables/examples/plug-ins/dom_sort.html
/* Create an array with the values of all the input boxes in a column */
$.fn.dataTable.ext.order['dom-text'] = function  ( settings, col )
{
    return this.api().column( col, {order:'index'} ).nodes().map( function ( td, i ) {
        return $('input', td).val();
    } );
}
 
/* Create an array with the values of all the input boxes in a column, parsed as numbers */
$.fn.dataTable.ext.order['dom-text-numeric'] = function  ( settings, col )
{
    return this.api().column( col, {order:'index'} ).nodes().map( function ( td, i ) {
        return $('input', td).val() * 1;
    } );
}
 
/* Create an array with the values of all the select options in a column */
$.fn.dataTable.ext.order['dom-select'] = function  ( settings, col )
{
    return this.api().column( col, {order:'index'} ).nodes().map( function ( td, i ) {
        return $('select', td).val();
    } );
}
 
/* Create an array with the values of all the checkboxes in a column */
$.fn.dataTable.ext.order['dom-checkbox'] = function  ( settings, col )
{
    return this.api().column( col, {order:'index'} ).nodes().map( function ( td, i ) {
        return $('input', td).prop('checked') ? '1' : '0';
    } );
}