how to load all matching data row for selected dropdown values ajax

i have dropdown boxes for user_id and week_id and once both selected i want to load all the data as rows. please advice.

 <select class="form-control" id="combo" name="week_starting_date">
                                            <option  disabled selected>Select Week:</option>
                                            @foreach($weeks as $weeks)

                                                <option value="{{ $weeks->id }}">{{ $weeks->week_starting_date }}</option>

                                            @endforeach
                                        </select>

 <select class="form-control"   name="user_id">
                                            <option  disabled selected>Select Driver:</option>
                                            @foreach($Role_user as $Roles)

                                                @if($getUsers = $Roles->user()->get())
                                                    @foreach( $getUsers as $getUser)
                                                        <option value="{{ $getUser->id }}">{{ $getUser->username }}</option>
                                                    @endforeach
                                                @endif

                                            @endforeach
                                        </select>

below is my controller

$getShifts = Shifts::Where('user_id', '=',$user_id)->Where('week_id','=',$week)->get();

how can i proceed

via Chebli Mohamed