dynamic - Symfony dependent dropdown with 3 entities -


so i'm create form 3 dropdowns interdependent. when 1 or several channel1s selected, choices channel 3 should change, according selected channel1. , dependent on that, last dropdown "agencies" should change choices. i've tried different solutions none of them has worked far. right i'm stuck on solution provided symfony's documentation, provides code 2 entities one, second dropdown doesn't have values, it's not working. here form type:

class selectiontype extends abstracttype {    protected $tokenstorage;   // private $manager;   public function __construct(tokenstorageinterface $tokenstorage)   {       $this->tokenstorage = $tokenstorage;     }   public function buildform(formbuilderinterface $builder, array $options)     {        //solution symfony documentation      $channel1s = new channel1();       $currentuser = $this->tokenstorage->gettoken()->getuser();       $builder       ->add('channel1s', entitytype::class, array(         'class' => 'appbundle:channel1',         'property' => 'name',         'label' => 'label.channel1s',         'empty_value' => 'label.select_channel1s',         'mapped' => false,         'expanded' => false,         'translation_domain' => 'uploadprofile',         'multiple' => true,         'required' => false,        ));       $formmodifier = function (forminterface $form, channel1 $channel1s = null) {         $channel3s = null === $channel1s ? array() : $channel1s->getchannel3();         $form->add('channel3s', entitytype::class, array(           'class' => 'appbundle:channel3',           'property' => 'name',           'label' => 'label.channel3s',           'empty_value' => 'label.select_channel3s',           'mapped' => false,           'expanded' => false,           'translation_domain' => 'uploadprofile',           'choices' => $channel3s,           'multiple' => true,           'choices_as_values' => true,         ));       };        $builder->addeventlistener(         formevents::pre_set_data,         function (formevent $event) use ($formmodifier) {           $data = $event->getdata();            $formmodifier($event->getform(), $data->getchannel1s());         }       );         $builder->get('channel1s')->addeventlistener(           formevents::post_submit,           function (formevent $event) use ($formmodifier) {             $channel1s = $event->getform()->getdata();             $formmodifier($event->getform()->getparent(), $channel1s);           }         );       }    public function setdefaultoptions(optionsresolverinterface $resolver)   {         $resolver->setdefaults(array(             'data_class' => 'documentbundle\entity\uploadprofile'         ));   }     public function getname()   {       return 'uploadprofile';   }   }

i've tried solution subscribers page: http://showmethecode.es/php/symfony/symfony2-4-dependent-forms/ didn't work out either.. think problem somewhere around line:

$channel3s = null === $channel1s ? array() : $channel1s->getchannel3();

but that's guess.. added ajax function: 

var $channel1s = $('#uploadprofile_channel1s'); $channel1s.change(function() {   var $form = $(this).closest('form');   var data = {};   data[$channel1s.attr('name')] = $channel1s.val();   // data[channel3s.attr('name')] = channel3s.val();   $.ajax({     url : $form.attr('action'),     type: $form.attr('method'),     data : data,     success: function(html) {       $('#uploadprofile_channel3s').replacewith(         $(html).find('#uploadprofile_channel3s')       );     }   }); });

my 3 entities have manytomany or onetomany relationships , should have right getters , setters, if needs them varify, let me know , upload them!

i've been stuck on quite while now, happy kind of or advise!

note: there's still third entity (agency) added since not first one's working, decided upload first two..

added: or maybe can explain line: 

$channel3s = null === $channel1s ? array() : $channel1s->getchannel3s(); might be, problem?


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