Coding style:
```
$(document).ready(function () {
    var aTable = $('#dataTable').DataTable();
    $("#Anwesend").click(function() {
        if ($("#Anwesend").is(":checked")) {
            aTable.fnFilter( 'anwesend', 0, true, false );
            console.log("click")
        } else {
            aTable.fnFilter('.*', 0, true, false);
        }
    });
});
```
Please add a newline at the end of the file.