Question

我正在构建一个Symfony应用程序，并使用带有一些jquery / ajax的表单事件来完成整个“州/地区”的事情。我有一个小问题，我使用的格式省 - ＆gt;城市 - ＆gt;市郊。现在我可以告诉我的代码很好，但是当执行到达我向“City”选择添加监听器的部分时，它会抛出一个错误，说明以下内容：

The child with the name "physicalCity" does not exist.

当我尝试向新创建的字段添加事件监听器时，这显然会发生这种情况，从而为事件监听器创建的元素添加事件监听器？

以下代码的一部分......我做错了什么？非常感谢任何帮助！

public function buildForm(FormBuilderInterface $builder, array $options) {
        $builder
            ->add('schoolName')
            ->add('physicalProvince', 'entity', array(
                'mapped' => false,
                'class' => 'MY\MainBundle\Entity\Province',
                'empty_value' => 'Select a province',
                'attr' => array(
                    'class' => 'province',
                    'data-show' => 'physical-city',
                )
            ));

        /*
         * For the physical cities
         */
        $physicalCityModifier = function(FormInterface $form, Province $province = null) {
            if (null !== $province)
                $cities = $province->getCities();
            else
                $cities = array();

            $form->add('physicalCity', 'entity', array(
                'mapped' => false,
                'class' => 'MY\MainBundle\Entity\City',
                'empty_value' => 'Select a province first',
                'choices' => $cities,
                'attr' => array(
                    'class' => 'city physical-city',
                    'data-show' => 'physical-suburb'
                )
            ));
        };

        $builder->addEventListener(
            FormEvents::PRE_SET_DATA,
            function(FormEvent $event) use ($physicalCityModifier) {
                $data = $event->getData();
                if (is_object($data->getPhysicalSuburb()))
                    $province = $data->getPhysicalSuburb()->getCity()->getProvince();
                else
                    $province = null;

                $physicalCityModifier($event->getForm(), $province);
            }
        );

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

        /*
         * For the physical suburbs
         */
        $physicalSuburbModifier = function(FormInterface $form, City $city = null) {
            if (null !== $city)
                $suburbs = $city->getSuburbs();
            else
                $suburbs = array();

            $form->add('physicalSuburb', null, array(
                'choices' => $suburbs,
                'empty_value' => 'Select a city first',
                'attr' => array(
                    'class' => 'physical-suburb'
                ),
            ));
        };

        $builder->addEventListener(
            FormEvents::PRE_SET_DATA,
            function(FormEvent $event) use ($physicalSuburbModifier) {
                $data = $event->getData();
                if (is_object($data->getCity()))
                    $city = $data->getCity();
                else
                    $city = null;

                $physicalSuburbModifier($event->getForm(), $city);
            }
        );

        $builder->get('physicalCity')->addEventListener(
            FormEvents::POST_SUBMIT,
            function(FormEvent $event) use ($physicalSuburbModifier) {
                $city = $event->getForm()->getData();

                $physicalSuburbModifier($event->getForm()->getParent(), $city);
            }
        );
}

Answer 1

如果其他人有类似问题，我最终会在this site的帮助下为每个领域的活动订阅者做好准备（将其翻译为我们中间非西班牙语的人）。

基本上，我所做的是为每个字段（包括省）创建一个新的Subscriber类，然后在每个字段中创建一个查询构建器，以使用前面字段中的值填充它们的值。代码如下所示。

AddProvinceFieldSubscriber.php

class AddProvinceFieldSubscriber implements EventSubscriberInterface {
    private $factory;
    private $fieldName;
    private $type;

    public function __construct(FormFactoryInterface $factory, $fieldName) {
        $this->factory = $factory;
        $this->fieldName = $fieldName . 'Province';
        $this->type = $fieldName;
    }

    public static function getSubscribedEvents() {
        return array(
            FormEvents::PRE_SET_DATA => 'preSetData',
            FormEvents::PRE_SUBMIT => 'preSubmit',
        );
    }

    private function addProvinceForm(FormInterface $form, $province) {
        $form->add($this->factory->createNamed($this->fieldName, 'entity', $province, array(
            'class' => 'MyThing\MainBundle\Entity\Province',
            'mapped' => false,
            'empty_value' => 'Select a province',
            'query_builder' => function (EntityRepository $repository) {
                $qb = $repository->createQueryBuilder('p');
                return $qb;
            },
            'auto_initialize' => false,
            'attr' => array(
                'class' => 'province ' . $this->type .'-province',
                'data-show' => $this->type . '-city',
            )
        )));
    }

    public function preSetData(FormEvent $event) {
        $form = $event->getForm();
        $data = $event->getData();

        if (null === $data)
            return;

        $fieldName = 'get' . ucwords($this->type) . 'Suburb';
        $province = ($data->$fieldName()) ? $data->$fieldName()->getCity()->getProvince() : null;
        $this->addProvinceForm($form, $province);
    }

    public function preSubmit(FormEvent $event) {
        $form = $event->getForm();
        $data = $event->getData();

        if (null === $data)
            return;

        $province = array_key_exists($this->fieldName, $data) ? $data[$this->fieldName] : null;
        $this->addProvinceForm($form, $province);
    }
}

AddCityFieldSubscriber.php

class AddCityFieldSubscriber implements EventSubscriberInterface {
    private $factory;
    private $fieldName;
    private $provinceName;
    private $suburbName;
    private $type;

    public function __construct(FormFactoryInterface $factory, $fieldName) {
        $this->factory = $factory;
        $this->fieldName = $fieldName . 'City';
        $this->provinceName = $fieldName . 'Province';
        $this->suburbName = $fieldName . 'Suburb';
        $this->type = $fieldName;
    }

    public static function getSubscribedEvents() {
        return array(
            FormEvents::PRE_SET_DATA => 'preSetData',
            FormEvents::PRE_SUBMIT => 'preSubmit',
        );
    }

    private function addCityForm(FormInterface $form, $city, $province) {
        $form->add($this->factory->createNamed($this->fieldName, 'entity', $city, array(
            'class' => 'MyThing\MainBundle\Entity\City',
            'empty_value' => 'Select a city',
            'mapped' => false,
            'query_builder' => function (EntityRepository $repository) use ($province) {
                $qb = $repository->createQueryBuilder('c')
                                ->innerJoin('c.province', 'province');
                if ($province instanceof Province) {
                    $qb->where('c.province = :province')
                       ->setParameter('province', $province);
                } elseif (is_numeric($province)) {
                    $qb->where('province.id = :province')
                       ->setParameter('province', $province);
                } else {
                    $qb->where('province.provinceName = :province')
                       ->setParameter('province', null);
                }

                return $qb;
            },
            'auto_initialize' => false,
            'attr' => array(
                'class' => 'city ' . $this->type . '-city',
                'data-show' => $this->type . '-suburb',
            )
        )));
    }

    public function preSetData(FormEvent $event) {
        $data = $event->getData();
        $form = $event->getForm();

        if (null === $data) {
            return;
        }

        $fieldName = 'get' . ucwords($this->suburbName);
        $city = ($data->$fieldName()) ? $data->$fieldName()->getCity() : null;
        $province = ($city) ? $city->getProvince() : null;
        $this->addCityForm($form, $city, $province);
    }

    public function preSubmit(FormEvent $event) {
        $data = $event->getData();
        $form = $event->getForm();

        if (null === $data)
            return;

        $city = array_key_exists($this->fieldName, $data) ? $data[$this->fieldName] : null;
        $province = array_key_exists($this->provinceName, $data) ? $data[$this->provinceName] : null;
        $this->addCityForm($form, $city, $province);
    }
}

最后是AddSuburbFieldSubscriber.php

class AddSuburbFieldSubscriber implements EventSubscriberInterface {
    private $factory;
    private $fieldName;
    private $type;

    public function __construct(FormFactoryInterface $factory, $fieldName) {
        $this->factory = $factory;
        $this->fieldName = $fieldName . 'Suburb';
        $this->type = $fieldName;
    }

    public static function getSubscribedEvents() {
        return array(
            FormEvents::PRE_SET_DATA => 'preSetData',
            FormEvents::PRE_SUBMIT => 'preSubmit',
        );
    }

    private function addSuburbForm(FormInterface $form, $city) {
        $form->add($this->factory->createNamed($this->fieldName, 'entity', null, array(
            'class' => 'MyThing\MainBundle\Entity\Suburb',
            'empty_value' => 'Select a suburb',
            'query_builder' => function (EntityRepository $repository) use ($city) {
                $qb = $repository->createQueryBuilder('s')
                                ->innerJoin('s.city', 'city');

                if ($city instanceof City) {
                    $qb->where('s.city = :city')
                       ->setParameter('city', $city);
                } elseif (is_numeric($city)) {
                    $qb->where('city.id = :city')
                       ->setParameter('city', $city);
                } else {
                    $qb->where('city.cityName = :city')
                       ->setParameter('city', null);
                }
                    $sql = $qb->getQuery()->getSQL();

                return $qb;
            },
            'auto_initialize' => false,
            'attr' => array(
                'class' => 'suburb ' . $this->type . '-suburb',
            ),
        )));
    }

    public function preSetData(FormEvent $event) {
        $data = $event->getData();
        $form = $event->getForm();

        if (null === $data)
            return;

        $fieldName = 'get' . ucwords($this->fieldName);
        $city = ($data->$fieldName()) ? $data->$fieldName()->getCity() : null;
        $this->addSuburbForm($form, $city);
    }

    public function preSubmit(FormEvent $event) {
        $data = $event->getData();
        $form = $event->getForm();

        if (null === $data)
            return;

        $city = array_key_exists($this->type . 'City', $data) ? $data[$this->type . 'City'] : null;
        $this->addSuburbForm($form, $city);
    }
}

我必须在那里添加一些额外的东西，但你得到了它的要点。

在我的表单类型中，我只需添加以下内容：

$builder
    ->addEventSubscriber(new AddProvinceFieldSubscriber($factory, 'postal'))
    ->addEventSubscriber(new AddCityFieldSubscriber($factory, 'postal'))
    ->addEventSubscriber(new AddSuburbFieldSubscriber($factory, 'postal'))
//...

快乐的日子！希望这有助于某人。

另外，我添加了data-show属性来简化我的AJAX过程，以防万一有人在想。

Answer 2

对于那些喜欢简单性的人，可以通过将逻辑放入控制器中来将所需的任何字段与另一个字段相关联。

因此，您可以使用ajax检查特定选择的任何更改，并将结果发送到控制器中的方法，该方法将返回从数据库中获取的结果。

您的依存选择框将包含与父选择有关的特定选项。

将事件侦听器添加到由事件侦听器添加的表单元素

2 个答案: