How to set combobox selected value in laravel 5?

I am using laravel 5 and I have an update/edit form which include a combobox on it. But I can't set my combobox value depends on what in the database. Do you know how to do it?
Here is my controller:

public function ubahsurat(Request $request)
{
    Surat::where('nomor_surat', '=', $request['nomor_surat'])->update(
                            ['id_jenis_surat' => $request['id_jenis_surat']],

    return redirect('/');
}

This is the view:

<div class="col-sm-9">
                        <select name="id_jenis_surat" class="form-control">
                            <option></option>
                            @foreach($jenis_surat as $js) 
                                <option value="" >  </option> 
                            @endforeach
                        </select>
                    </div>

via Chebli Mohamed