Dependent dropdown menus

A while ago I asked a similar question and had a couple of responses one has got me a bit closer but I'm still struggling with an issue.

routes.php

Route::get('/getStreets', function($id) {
   return Street::whereSuburb($id)->get();
});
Street.php (Model)

public static function whereSuburb($id){ return DB::table('streets') ->select('streetName', 'id') ->where('suburbsId', '=', $id) ->get(); }

view.blade.php

{{ Form::open(['route' => 'get_address_path']) }} {{ Form::label('suburb', 'Suburb:') }} {{ Form::select('suburb', $suburbs, ['class' => 'form-control']) }} {{ Form::label('street_names', 'Street:') }}

                    </div>
                    <div class="form-group">
                        {{ Form::submit('Get Addresses',['class' => 'btn btn-default btn-xs']) }}
                    </div>
                {{ Form::close() }}

```

When I change suburbs I get nothing happening, I've tested the model and whereSuburb($id) and I get what I'm after although I don't know if it is best practice but it is working.

Any ideas would be appreciated as I have for my application a few uses for dependent dropdown menus so it is really holding me up trying to figure this out.