MediaWiki:Common.js

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

  function saveSidebarScrollPosition() {
    try {
      var scrollPosition = document.getElementById(sidebarId).scrollTop;
      var currentPage = window.location.href;
      sessionStorage.setItem(currentPage, scrollPosition);
    } catch (error) {
      console.error('Error saving scroll position:', error);
    }
  }

  function restoreSidebarScrollPosition() {
    try {
      var currentPage = window.location.href;
      var scrollPosition = sessionStorage.getItem(currentPage);
      if (scrollPosition !== null) {
        var sidebar = document.getElementById(sidebarId);
        if (sidebar) {
          sidebar.scrollTop = parseInt(scrollPosition);
        }
      }
    } catch (error) {
      console.error('Error restoring scroll position:', error);
    }
  }

  // Save scroll position when the page is hidden (user navigates away)
  document.addEventListener('visibilitychange', function () {
    if (document.visibilityState === 'hidden') {
      saveSidebarScrollPosition();
    }
  });

  // Restore scroll position when the page is visible (user comes back)
  document.addEventListener('visibilitychange', function () {
    if (document.visibilityState === 'visible') {
      restoreSidebarScrollPosition();
    }
  });

  // Save scroll position when the sidebar is scrolled
  var sidebar = document.getElementById(sidebarId);
  if (sidebar) {
    sidebar.addEventListener('scroll', saveSidebarScrollPosition);
  }

  // Restore scroll position when the initial HTML document has been completely loaded and parsed
  document.addEventListener('DOMContentLoaded', restoreSidebarScrollPosition);
})();