php - Symfony2- Twig : HTML Tag

Question

我需要创建一个带标签的选择。

这是我用来填充选择的代码

        ->add('city', 'entity', array(
            'empty_value' => 'Choisissez une option',
            'class' => 'FrontBundle:City',
            'query_builder' => function(EntityRepository $er) {
                return $er->createQueryBuilder('c')
                    ->orderBy('c.city', 'ASC');
            },
        ))

这是我在 html.twig 中的代码

                    <div class="form-group">
                        {{ form_label(form.city, 'Ville') }}
                        <div class="col-sm-8">
                            {{ form_widget(form.city) }}
                        </div>
                    </div>

这是我想要得到的结果:

<select>
  <optgroup label="Région 1">
     <option value="ville 1">Ville 1</option>
     <option value="ville 2">Ville 2</option>
  </optgroup>
  <optgroup label="Région 2">
     <option value="ville 3">Ville 3</option>
     <option value="ville 4">Ville 4</option>
   </optgroup>
</select>

有什么想法吗？谢谢。

Answer 1

作为gp_sflover说in comments , 您可以使用 group_by option entity 字段类型:

This is a property path (e.g. author.name) used to organize the available choices in groups. It only works when rendered as a select tag and does so by adding optgroup elements around options. Choices that do not return a value for this property path are rendered directly under the select tag, without a surrounding optgroup.

因此，假设 region 是 city 的属性，您的代码应该如下所示:

    ->add('city', 'entity', array(
        'empty_value' => 'Choisissez une option',
        'class' => 'FrontBundle:City',
        'query_builder' => function(EntityRepository $er) {
            return $er->createQueryBuilder('c')
                ->orderBy('c.city', 'ASC');
        },
        'group_by' => 'region',
    ))