Dependent SELECT fields feature

[Webkadabra]

It'd be nice to have a way to create dependent SELECTs and AUTOCOMPLETE.

For example, there are 3 SELECT elements: SELECT country_ID, SELECT region_id, SELECT city_id.
When user chooses COUNTRY_ID - I'd like to update list of options in REGION SELECT, and when region is selected - update options in CITY select.

It would be really great not to load all city options on page load, as it may have somewhere from 20k records up to many thousands for huge app.

ALSO, I'd like to add autocomplete field for street_id, and this autocomplete must become available/active only when all three above selects are filed in, and make this AUTOCOMPLETE search at endpoit like /admin/api-street-id/?city_id=123, where 123 is city_id from city_id SELECt value.

I mean it's easy to do it in yii2/jQuery UI, but I'm so new to the angularJS I'm not as capable 🥇

[nadar]

We have an issue with a concrete implementation plan => #298