The submenu closes after selection, how to make it not close?

Question

PHP

vh130226.eurodir.ru
On this site, the side menu closes after selection. Please tell me how to make it so that after reloading the page - side. the menu opened by the user and remained open?
Bootstrap and jasny-bootstrap

Answer 1

Alternatively, cookies. When opening a specific block, fill in the value - when opening the page, check the value in the cookies and add the block selection class to the specific block.
(JS)

Answer 2

you can do it in js - before loading, check which page we are on and open the menu (you open it by adding the "open" class to the li element. )