How to update forms dynamically with Flask?

Question

JavaScript

Good afternoon. There is a form with set select. The first select should affect the second, and so on. How, when choosing a value in the first select, automatically change the available values ​​in the second? On pure Flask.

Answer 1

It is necessary to write on the front in javascript handlers for changing the values ​​of selects that make ajax requests to the backend and fill the selects with the results of the responses, and on the backend write ajax request handlers that return the necessary data.