MediaWiki:Common.js

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(function () {
  var sidebarId = 'mw-navigation';

  function saveSidebarScrollPosition() {
    var scrollPosition = document.getElementById(sidebarId).scrollTop;
    localStorage.setItem('sidebarScrollPosition', scrollPosition);
  }

  function restoreSidebarScrollPosition() {
    var scrollPosition = localStorage.getItem('sidebarScrollPosition');
    if (scrollPosition !== null) {
      document.getElementById(sidebarId).scrollTop = parseInt(scrollPosition);
    }
  }

  window.addEventListener('beforeunload', saveSidebarScrollPosition);
  window.addEventListener('load', function () {
    setTimeout(restoreSidebarScrollPosition, 1);
  });

  var sidebarLinks = document.querySelectorAll('#' + sidebarId + ' a');
  sidebarLinks.forEach(function (link) {
    link.addEventListener('click', function (event) {
      saveSidebarScrollPosition();
    });
  });

  var sidebarHeadings = document.querySelectorAll('#' + sidebarId + ' .sidebar-heading');
  sidebarHeadings.forEach(function (heading) {
    heading.addEventListener('click', function (event) {
      saveSidebarScrollPosition();
    });
  });
})();