How to create selects with ajax loading in symfony?

Question

JavaScript

Good afternoon.
There are 3 drop-down lists:
- country
- region
- city

There is a controller, there is a form. When choosing a country in the drop-down list, we send an ajax request, get a list of regions belonging to the country, update the drop-down list with a choice of regions, after choosing a region, load the list of cities.

The main problem is that in symphony, in the formtype for the drop-down list, you must specify choices, otherwise the form will not be valid when submitting. How to do it right? Please share an example.

Answer 1

This can be done via form events, here is an example from Cookbook symfony.com/doc/current/cookbook/form/dynamic_form...

Answer 2

You have the opportunity to create your own form type (ala ajax-select), make your own form view for it, data transformers, whatever. What's the problem then?