Symfony2 - Twig：HTML <optgroup> 标签

Question

我需要创建一个带有标签的 select。

这是我填写的代码 select

        ->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？谢谢你。

Answer 1

作为 entity 字段类型的 gp_sflover said , you can use the group_by option：

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',
    ))

Symfony2 - Twig：HTML <optgroup> 标签

Symfony2 - Twig : HTML <optgroup> Tag

html

php

symfony

twig