laravel5.1 ค่าจาก value ไม่ส่งเข้า drop downlist อันที่ 2 ช่วยแนะนำหน่อยครับ //dynamic drop down list

<?php
namespace App\Http\Controllers;
use App\Model\Province;
use App\Model\Bras;
use Illuminate\Http\Request;
use View;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use DB;
use Illuminate\Support\Facades\Input;

class ProvinceController extends Controller
{

    public function province(){
      $dataProvince = Province::all();
       $rowsProvince = array();
       $rowsProvince[''] = 'select province';
       foreach ($dataProvince as $rowProvince) {
           $rowsProvince[$rowProvince->provinceid] = $rowProvince->nameprovince;
       }
       return View::make('index')->with('rowsProvince', $rowsProvince);
    }
}

<div class="container">
    <h2>test</h2>
    <div>
      {{Form::open(array('url'=> '' , 'file'=>true))}}
          <div class="form-group">
              {{ Form::label('provinceid', 'Province') }}
              {{ Form::select('provinceid', $rowsProvince, null,array('class' => 'form-control')) }}
         </div>
         <div class="form-group">
            {{ Form::label('brasid', 'Bras') }}
            {{ Form::select('brasid', array('--'),null,array('class' => 'form-control')) }}
         </div>
      {{Form::close()}}
    </div>
</div>

<script>
$('#provinceid').on('change', function(e){
  console.log(e);
    var provinceid = e.target.value;
       //ajax
       $.getJSON('/Province/bras?provinceid=' + provinceid , function(data){
           //success data
           console.log(data);
           var bras = $('#brasid');
           bras.empty();
           $.each(data, function(index, brasObj){
             //console.log('brasid');
              //alert(data);
               bras.append("option value='" +brasObj.id+ "'>"+brasObj.name+"</option>");
           });
       });
   });
</script>