{!! Form::open(array('action' => 'ProductController@search', 'method'=>'get')) !!}
    <div class="input-group">
        <input name="keyword" type="text" class="form-control" placeholder="{{ trans('site.Search') }}...">
        <span class="input-group-btn">
            <button class="btn btn-default" type="submit">{{ trans('site.Search') }}</button>
        </span>
    </div>
{!! Form::close(); !!}