将事件侦听器添加到由事件侦听器添加的表单元素

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 - >城市 - >郊区.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？

代码的一部分如下......我做错了什么？任何帮助将非常感谢!

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

如果其他人有类似的问题,我最终在每个领域的活动订阅者的帮助下,在这个网站的帮助下(将其翻译为我们中间的那些非西班牙语的人).

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);
    }
}

我不得不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'))
//...

和快乐的日子!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.