MediaWiki:Common.css

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/* MediaWiki:Common.js
   Lightweight fallback mobile menu
   Activates only when Minerva/native mobile menu is not present
*/

mw.hook('wikipage.content').add(function () {
  // Only run on narrow screens
  if (window.innerWidth > 800) return;

  // If native Minerva menu exists, do nothing
  if (document.querySelector('.minerva-menu-button, .minerva-hamburger, .mw-mobile-menu')) return;

  // Avoid injecting twice
  if (document.querySelector('.fallback-mobile-hamburger')) return;

  // Create hamburger button
  var btn = document.createElement('button');
  btn.className = 'fallback-mobile-hamburger';
  btn.type = 'button';
  btn.setAttribute('aria-label', 'Open menu');
  btn.setAttribute('aria-expanded', 'false');
  btn.innerHTML = '☰';

  // Insert into header area (best-effort)
  var header = document.querySelector('.minerva-header') || document.querySelector('#mw-head') || document.body;
  try {
    header.insertBefore(btn, header.firstChild);
  } catch (e) {
    document.body.appendChild(btn);
  }

  // Create overlay and panel
  var overlay = document.createElement('div');
  overlay.className = 'fallback-mobile-overlay';
  overlay.setAttribute('role', 'dialog');
  overlay.setAttribute('aria-modal', 'true');
  overlay.style.display = 'none';

  var panel = document.createElement('nav');
  panel.className = 'fallback-mobile-panel';
  panel.setAttribute('aria-label', 'Mobile menu');
  panel.setAttribute('role', 'menu');

  overlay.appendChild(panel);

  // Close control
  var close = document.createElement('div');
  close.className = 'fallback-mobile-close';
  close.innerHTML = '<a href="#" aria-label="Close menu">✕</a>';
  panel.appendChild(close);

  // Menu links — mirror typical Mobile-menu entries
  var links = [
    { href: mw.util.getUrl('Main_Page'), label: 'Home' },
    { href: mw.util.getUrl('Special:Search'), label: 'Search' },
    { href: mw.util.getUrl('Recentchanges'), label: 'Recent changes' },
    { href: mw.util.getUrl('Special:Random'), label: 'Random page' },
    { href: mw.util.getUrl('Special:AllPages'), label: 'All pages' },
    { href: mw.util.getUrl('Special:Categories'), label: 'Categories' },
    { href: mw.util.getUrl('Special:Upload'), label: 'Upload file' }
  ];

  links.forEach(function (lnk) {
    var a = document.createElement('a');
    a.href = lnk.href;
    a.textContent = lnk.label;
    a.setAttribute('role', 'menuitem');
    a.tabIndex = 0;
    panel.appendChild(a);
  });

  document.body.appendChild(overlay);

  // Focus management helpers
  function trapFocus(container) {
    var focusable = container.querySelectorAll('a, button, [tabindex]:not([tabindex="-1"])');
    if (!focusable.length) return null;
    var first = focusable[0];
    var last = focusable[focusable.length - 1];

    function handleTab(e) {
      if (e.key !== 'Tab') return;
      if (e.shiftKey && document.activeElement === first) {
        e.preventDefault();
        last.focus();
      } else if (!e.shiftKey && document.activeElement === last) {
        e.preventDefault();
        first.focus();
      }
    }
    document.addEventListener('keydown', handleTab);
    return function remove() { document.removeEventListener('keydown', handleTab); };
  }

  var removeTrap = null;

  function openMenu() {
    overlay.style.display = 'flex';
    document.body.style.overflow = 'hidden';
    btn.setAttribute('aria-expanded', 'true');
    // focus first link
    var firstLink = panel.querySelector('a');
    if (firstLink) firstLink.focus();
    removeTrap = trapFocus(panel);
  }

  function closeMenu() {
    overlay.style.display = 'none';
    document.body.style.overflow = '';
    btn.setAttribute('aria-expanded', 'false');
    if (removeTrap) { removeTrap(); removeTrap = null; }
    btn.focus();
  }

  // Event listeners
  btn.addEventListener('click', function (e) {
    e.preventDefault();
    openMenu();
  });

  overlay.addEventListener('click', function (e) {
    if (e.target === overlay) closeMenu();
  });

  close.addEventListener('click', function (e) {
    e.preventDefault();
    closeMenu();
  });

  // Close on Escape
  document.addEventListener('keydown', function (e) {
    if (e.key === 'Escape' && overlay.style.display === 'flex') {
      closeMenu();
    }
  });

  // If viewport is resized to desktop, remove fallback elements
  window.addEventListener('resize', function () {
    if (window.innerWidth > 800) {
      if (overlay.parentNode) overlay.parentNode.removeChild(overlay);
      if (btn.parentNode) btn.parentNode.removeChild(btn);
      document.body.style.overflow = '';
    }
  });
});