Why input fields don't have form-class included when using Bootstrap about ignited-datatables HOT 2 CLOSED

// adapt input/select to bootstrap
function adaptInputBootstrap(oTable) {
    oTable.each(function() {
        var dt = $(this);

        var dtWrapper = dt.closest('.dataTables_wrapper');
        // SEARCH - Add the placeholder for Search and Turn this into in-line formcontrol
        var search_input = dtWrapper.find('div[id$=_filter] input');
            search_input
                .attr('placeholder', 'Buscar')
                .addClass('form-control');
        // LENGTH - Inline-Form control
        var length_sel = dtWrapper.find('div[id$=_length] select');
            length_sel.addClass('form-control');
        // LENGTH - Info adjust location
        var length_sel = dtWrapper.find('div[id$=_info]');
            length_sel.css('margin-top', '18px');
    });
}




$(document).ready(function() {

    oTable = $('#unidades').dataTable( {
        "bProcessing": true,
        "bServerSide": true,
        "sAjaxSource": "file.php",

        "fnServerData": function(sSource, aoData, fnCallback) {
            $.ajax({
                'dataType': 'json',
                'type'    : 'POST',
                'url'     : sSource,
                'data'    : aoData,
                'success' : fnCallback                
            });
        },

    // adapt input/select to bootstrap
    adaptInputBootstrap(oTable);

});