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POBest way to make a Symfony2 Form with multi select in cascade
 

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  1. POBest way to make a Symfony2 Form with multi select in cascade
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    <p>I have 3 entity (Country, Region, City)</p> <pre><code>namespace ****\****Bundle\Entity; use Doctrine\ORM\Mapping as ORM; use Symfony\Component\Validator\Constraints as Assert; class Country { private $id; private $name; /** * @var integer $regions * * @ORM\OneToMany(targetEntity="Region", mappedBy="Country") */ protected $regions; //... } class Region { private $id; private $name; /** * @var integer $country * * @Assert\Type(type="****\***Bundle\Entity\Country") * @ORM\ManyToOne(targetEntity="Country", inversedBy="regions") * @ORM\JoinColumn(name="country_id", referencedColumnName="id", nullable=false) */ private $country; /** * @ORM\OneToMany(targetEntity="City", mappedBy="Region") */ protected $cities; } class City { private $id; private $name; /** * @var integer $region * * @Assert\Type(type="****\****Bundle\Entity\Region") * @ORM\ManyToOne(targetEntity="Region", inversedBy="cities") * @ORM\JoinColumn(name="region_id", referencedColumnName="id", nullable=false) */ private $region; /** * @ORM\OneToMany(targetEntity="Company", mappedBy="City") */ protected $companys; //... } </code></pre> <p>Here is my Form Class for City:</p> <pre><code>namespace ****\****Bundle\Form; use Symfony\Component\Form\AbstractType; use Symfony\Component\Form\FormBuilderInterface; use Symfony\Component\OptionsResolver\OptionsResolverInterface; class CityType extends AbstractType { public function buildForm(FormBuilderInterface $builder, array $options) { $builder -&gt;add('name') -&gt;add('region'); } public function setDefaultOptions(OptionsResolverInterface $resolver) { $resolver-&gt;setDefaults(array( 'data_class' =&gt; '****\****Bundle\Entity\City', )); } public function getName() { return 'city'; } } </code></pre> <p>This make a basic HTML5 Form with a textBox for the name and a SelectBox where all the region is available.</p> <p>My question is what is the best way for adding a first SelectBox that will allow me to select the country in order to filter the second SelectBox and decrease the number of choice of Region?</p> <p>EventListener ? The Event Dispatcher Component ?</p>
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