How to generate a link depending on the current page?

Question

JavaScript

Task: let's say there is a site with a list of certain objects. The initial login to site.com takes me to site.com/object-1/ . It doesn't matter how it will happen, for example, depending on my location. So, a sidebar with all objects objects-1, objects-2, objects-3, objects-4, etc. is on all pages. Also on the site there is a main menu with the items "Address", "Contacts", "Promotions" and they are different for all objects.
The question is how to make links on the page in such a way that being, suppose, on the "Contacts" page at site.com/object-1/contacts/ , clicking on the object-3 sidebar would take me to the site.com/object-3 page /contacts/. In general, you need to somehow remember which object the user is currently on and generate links depending on it.
The server part on Django and there it will be implemented, as I understand it, using regular expressions in urls.py, but how can such links be generated in the html itself?

Answer 1

javascript.ru/window-location