Using jQuery-cookie we can implement a collapsable side-nav that remember the last status of the toggle (collapse/expand) even when we refresh the page!

See the demo below and check the code using my Codepen tabs.

See the Pen AEIpe by Farbod (@carmijoon) on CodePen.

Tip: To remember the trigger class for all URLs of the website and not just one page, You need to create expiring cookie, valid across entire site:
$.cookie('the_cookie', 'the_value', { expires: 7, path: '/' });