Field with multiple dependencies

[alcohol]

I can't seem to get the following to work:

Form Foo with fields:

• A / a checkbox type input
• B / a choice type input
  • depends on A, if A is checked, B is not added

    ->addDependent('B', ['A'], function (DependentField $field, ?bool $checkbox): void {
      if ($checkbox) {
        return;
      }
      $field->add(ChoiceType::class, /* [...] */);
    }

• C / a text type input
  • depends on A, if A is checked, C is not added, depends on B, options change based on the value of B

    ->addDependent('C', ['A', 'B'], function (DependentField $field, ?bool $checkbox, ?string $choice): void {
      if ($checkbox) {
        return;
      }
      $field->add(TextType::class, /* [...] */);
    }

The above doesn't work though; if I check A, B disappears, but C is still added (or not removed 🤷).

[alcohol]

I guess this relates to #4 (comment) -- specifically, option B mentioned in this comment.

[toby-griffiths]

I have had a similar issue with a form for dietary requirements. I have the folllowing fields…

a. Do you have any dietrary requirements (yes/no)?
b. [only if a. = yes] Select your dietary requirement from a list of options;
c. [only if b. is not empty] Collection of fields asking…

• What is the reason (choice/intolerance/allergy)?

The problem I had… if I go from a form with…
a. yes;
b. something slected (so c. contains some reason fields for the selection);
c completed reason field(s);
… to…
a. no;
… then field b. disappears, but c. does not… BUT… only when I save the data. If I don't perform a save, field c. also, correctly, disapears. Done a whole load of step debugging, but still cannot fathom why this might be!?

My workaround was to add the following event listener to the form builder that adds the dynamic fields…

        ->addEventListener(FormEvents::PRE_SUBMIT, function (PreSubmitEvent $event) {
            $data = $event->getData();
            if (!($data['hasRequirements'] ?? false)) { // <= if a. is 'no'
                // First I tried this, to remove the collection of reasons, however the previously selected
                // reasons form still appears, just with empty values…
                $data['requirements'] = [];
                // So I also removed the child form all together…
                $event->getForm()->remove('requirements');
            }
            $event->setData($data);
        });