Question

我解释了我的问题：

我必须创建一个表单，根据我们之前的选择填充下拉列表。

我有两个实体：

一个地区可能有多个城市（ManyToOne）关系。

我按照此处的文档How to Dynamically Modify Forms Using Form Events (Dynamic Generation for Submitted Forms)。

以下是实体的代码：

地区实体：

class Region
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="nom", type="string", length=255)
     */
    private $nom;

    /**
     * @var int
     *
     * @ORM\Column(name="numero", type="smallint")
     */
    private $numero;
}

Ville实体：

class Ville
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="nom", type="string", length=255)
     */
    private $nom;

    /**
     * @var int
     *
     * @ORM\Column(name="numero", type="smallint")
     */
    private $numero;

    /**
     * @var int
     *
     * @ORM\Column(name="codePostal", type="smallint")
     */
    private $codePostal;

    /**
     * @var Region
     *
     * @ORM\ManyToOne(targetEntity="GE\CandidatBundle\Entity\Region")
     */
    protected $region;
}

我的问题：

我使用query_builder选项检索区域列表，但如何根据区域选择检索城市列表。

AnnonceType：

 $builder
->add('region', EntityType::class, [
                'label' => 'Region *',
                'label_attr' => [
                    "class" => "smaller lighter blue",
                    "style" => "font-size: 21px;",
                ],
                'class'         => 'GECandidatBundle:Region',
                'choice_label'  => 'nom',
                'multiple'      => false,
                'query_builder' => function(RegionRepository $repository) {
                    return $repository->getListeRegion();
                }
            ])
            ->add('ville', TextType::class, [
                'label' => 'Ville *',
                'label_attr' => [
                    "class" => "smaller lighter blue",
                    "style" => "font-size: 21px;",
                ],
            ]);
$formModifier = function (FormInterface $form, Region $region = null) {
            $ville = null === $region ? array() : $region->getNom();

            $form->add('ville', EntityType::class, array(
                'class' => 'GECandidatBundle:Ville',
                'placeholder' => '',
                'choices' => $ville,

                'label' => 'Ville *',
                'label_attr' => [
                    "class" => "smaller lighter blue",
                    "style" => "font-size: 21px;",
                ],
                'choice_label'  => 'nom',
                'multiple'      => false,
                /*'query_builder' => function(VilleRepository $repository) {
                    return $repository->getVilleByRegion();
                }*/
            ));
        };

        $builder->addEventListener(
            FormEvents::PRE_SET_DATA,
            function (FormEvent $event) use ($formModifier) {
                $data = $event->getData();
                $formModifier($event->getForm(), $data->getVille());
            }
        );

        $builder->get('region')->addEventListener(
            FormEvents::POST_SUBMIT,
            function (FormEvent $event) use ($formModifier) {
                $region = $event->getForm()->getData();
                $formModifier($event->getForm()->getParent(), $region);
            }
        );

new.html.twig：

    {{ form_start(form) }}
        {{ form_row(form.region) }}    {# <select id="ge_candidatbundle_annonce_region" ... #}
        {{ form_row(form.ville) }} {# <select id="ge_candidatbundle_annonce_ville" ... #}
        {# ... #}
    {{ form_end(form) }}
<script>
        var $region = $('#ge_candidatbundle_annonce_region');
        $region.change(function() {
            var $form = $(this).closest('form');
            var data = {};
            data[$region.attr('nom')] = $region.val();
            $.ajax({
                url : $form.attr('action'),
                type: $form.attr('method'),
                data : data,
                success: function(html) {
                    $('#ge_candidatbundle_annonce_ville').replaceWith(
                        $(html).find('#ge_candidatbundle_annonce_ville')
                    );
                }
            });
        });
    </script>

Answer 1

许多解决方案：

更简单的方法是将Region添加到class Region { /** * @var int * * @ORM\Column(name="id", type="integer") * @ORM\Id * @ORM\GeneratedValue(strategy="AUTO") */ private $id; /** * @var string * * @ORM\Column(name="nom", type="string", length=255) */ private $nom; /** * @var int * * @ORM\Column(name="numero", type="smallint") */ private $numero; /** @ORM\OneToMany(targetEntity="Ville", inversedBy="region") **/ protected $villes; public function getVilles() { return $this->villes; } public function setVilles($villes) { $this->villes = $villes; return $this; } // [... + get/setVilles functions ...] }实体并执行类似的操作：

$formModifier = function (FormInterface $form, Region $region = null) {
            $villes = null === $region ? array() : $region->getVilles();

            $form->add('ville', EntityType::class, array(
                'class' => 'GECandidatBundle:Ville',
                'placeholder' => '',
                'choices' => $villes,

                'label' => 'Ville *',
                'label_attr' => [
                    "class" => "smaller lighter blue",
                    "style" => "font-size: 21px;",
                ],
                'choice_label'  => 'nom',
                'multiple'      => false,
                /*'query_builder' => function(VilleRepository $repository) {
                    return $repository->getVilleByRegion();
                }*/
            ));
        };

        $builder->addEventListener(
            FormEvents::PRE_SET_DATA,
            function (FormEvent $event) use ($formModifier) {
                $data = $event->getData();
                $formModifier($event->getForm(), $data->getVille());
            }
        );

        $builder->get('region')->addEventListener(
            FormEvents::POST_SUBMIT,
            function (FormEvent $event) use ($formModifier) {
                $region = $event->getForm()->getData();
                $formModifier($event->getForm()->getParent(), $region);
            }
        );

在你的类型中：

VilleRepository

第二个选项：

取消注释您的查询构建器，并通过传递getVilleByRegion实体

参数，在您的region nom中实施

<强>更新

您使用非现有属性设置ajax数据<script> var $region = $('#ge_candidatbundle_annonce_region'); $region.change(function() { var $form = $(this).closest('form'); var data = {}; data[$region.attr('name')] = $region.val(); $.ajax({ url : $form.attr('action'), type: $form.attr('method'), data : data, success: function(html) { $('#ge_candidatbundle_annonce_ville').replaceWith( $(html).find('#ge_candidatbundle_annonce_ville') ); } }); }); </script>将您的javascript代码替换为：

{{1}}

Answer 2