[Symfony dynamic forms (select change)]

Hello all,

 

I have been developing with Symfony and ran into the problem of creating dynamic forms. My intention is to change part of a form by a select. Basically making a part of a form dependent on a select value. I have followed the docs from Symfony, but can't seem to understand it: http://symfony.com/doc/current/form/dynamic_form_modification.html#dynamic-generation-for-submitted-forms

 

This is an example I am working on: http://stackoverflow.com/questions/41281486/symfony-alter-form-on-entity-select-with-nested-collectiontypes/41283649#41283649

 

So far no one could really help. Based on that stackoverflow post, this is desired:

 

1. Select a company

2. Generate the forms for the departments of the selected company

 

Some how when I try to work in PRE_SUBMIT or the form modifier function I can't get any posted values. How could I achieve the example from the stackoverflow post?

 

Thanks!