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) {
      setTimeout(function () {
        document.getElementById(sidebarId).scrollTop = parseInt(scrollPosition);
      }, 0);
    }
  }

  window.addEventListener('beforeunload', saveSidebarScrollPosition);

  document.addEventListener('DOMContentLoaded', function () {
    restoreSidebarScrollPosition();

    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();
      });
    });
  });
})();