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"状态/位置"操作。不过，我有一个小问题，我使用的格式是省->市->郊区。现在，据我所知，我的代码很好，但当执行到达我在"City"选择中添加侦听器的部分时，它会抛出一个错误，显示如下：
The child with the name "physicalCity" does not exist.
当我尝试将事件侦听器添加到新创建的字段中，从而将事件侦听程序添加到由事件侦听器创建的元素中时，显然会发生这种情况？
下面是代码的一部分。。。我做错了什么？任何帮助都将不胜感激！
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);
}
);
}
如果其他人也有类似的问题，我最终在这个网站的帮助下，与每个字段的活动订阅者一起解决了这个问题（为我们当中那些不讲西班牙语的人翻译）。
基本上，我所做的是为每个字段（包括province）创建一个新的Subscriber类，然后在每个字段中创建一个查询生成器，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);
}
}
最后添加SuburbFieldSubscriber.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);
}
}
我不得不在里面添加一些额外的东西，但你明白了。
在我的表单类型中，我简单地添加了以下内容：
$builder
->addEventSubscriber(new AddProvinceFieldSubscriber($factory, 'postal'))
->addEventSubscriber(new AddCityFieldSubscriber($factory, 'postal'))
->addEventSubscriber(new AddSuburbFieldSubscriber($factory, 'postal'))
//...
还有快乐的日子！希望这能帮助到别人。
此外，我添加了data-show属性来简化AJAX过程，以防有人想知道。
对于那些喜欢简单性的人，您可以通过将逻辑放入控制器来将您想要的任何字段与另一个字段关联起来。
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一个方法，该方法将返回从数据库中获取的结果。
然后，您的从属选择框将包含与父选择相关的特定选项。