MediaWiki:Common.js

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

  function saveSidebarScrollPosition() {
    var scrollPosition = document.getElementById(sidebarId).scrollTop;
    var currentPage = window.location.href;
    sessionStorage.setItem(currentPage, scrollPosition);
  }

  function restoreSidebarScrollPosition() {
    var currentPage = window.location.href;
    var scrollPosition = sessionStorage.getItem(currentPage);
    if (scrollPosition !== null) {
      document.getElementById(sidebarId).scrollTop = parseInt(scrollPosition);
    }
  }

  // Create a MutationObserver to detect changes in the sidebar
  var observer = new MutationObserver(function (mutations) {
    mutations.forEach(function (mutation) {
      if (mutation.type === 'attributes' && mutation.attributeName === 'class') {
        saveSidebarScrollPosition();
      }
    });
  });

  // Configure the observer to watch for class attribute changes in the sidebar
  var observerConfig = {
    attributes: true,
    attributeFilter: ['class'],
    subtree: true
  };

  // Start observing the sidebar element
  var sidebarElement = document.getElementById(sidebarId);
  if (sidebarElement) {
    observer.observe(sidebarElement, observerConfig);
  }

  // Restore scroll position when the page is loaded
  window.addEventListener('load', restoreSidebarScrollPosition);
})();