dataTable doesn't view as it should be

I'm a beginner with programming and started to use dataTable, but is doesn't view as it should be. I used CodeIgniter with the AdminLTE template and dataTable in default. The columns are not sortable and the search box and pagination aren't showing to the right. How can I fix this?

<script type="text/javascript" charset="utf-8">
    $(document).ready(function() { $('#onderhoud').dataTable() } );
</script>