From 2b917603c6f22a807a20bb003d04e6ec24434b98 Mon Sep 17 00:00:00 2001
From: Dev Ashish Saradhana <41122199+Deva309@users.noreply.github.com>
Date: Mon, 9 Dec 2024 14:24:48 +0530
Subject: [PATCH] [MWPW-163735] - Added Local Nav keyboard navigation for
 mobile GNAV redesign (#3321)

* Added localnav keyboard navigation for mobile gnav redesign

* Added fixes for Local nav along with keyboard navigation

* lint fix
---
 .../global-navigation/global-navigation.css   | 34 ++++++--
 .../global-navigation/global-navigation.js    | 87 ++++++++++++-------
 .../utilities/keyboard/index.js               | 16 +++-
 .../utilities/keyboard/localNav.js            | 38 ++++++++
 .../utilities/keyboard/utils.js               |  3 +
 .../global-navigation/utilities/utilities.js  |  4 +-
 libs/styles/styles.css                        | 22 ++++-
 7 files changed, 158 insertions(+), 46 deletions(-)
 create mode 100644 libs/blocks/global-navigation/utilities/keyboard/localNav.js

diff --git a/libs/blocks/global-navigation/global-navigation.css b/libs/blocks/global-navigation/global-navigation.css
index 8948fa0fbb6..60f45a172a4 100644
--- a/libs/blocks/global-navigation/global-navigation.css
+++ b/libs/blocks/global-navigation/global-navigation.css
@@ -699,10 +699,6 @@ header.global-navigation {
   .feds-breadcrumbs a:hover {
     text-decoration: underline;
   }
-
-  header + div.feds-localnav {
-    display: none;
-  }
 }
 
 /* Small desktop styles */
@@ -1051,9 +1047,8 @@ header.new-nav .feds-breadcrumbs li:first-child:not(:nth-last-child(-n+3)):after
 
 /* local-nav */
 
-header + .feds-localnav {
+.feds-localnav {
   position: sticky;
-  display: block;
   top: 0;
   width: 100%;
   left: 0;
@@ -1099,6 +1094,7 @@ header + .feds-localnav {
   display: block;
   width: 100%;
   position: absolute;
+  overflow: auto;
 }
 
 .feds-localnav.active .feds-localnav-items .feds-menu-items {
@@ -1127,6 +1123,8 @@ header + .feds-localnav {
   font-size: 14px;
   padding: 12px 20px;
   background: var(--feds-background-popup);
+  outline-offset: -1px;
+  cursor: pointer;
 }
 
 .feds-localnav .feds-localnav-items .feds-menu-headline {
@@ -1134,28 +1132,50 @@ header + .feds-localnav {
   font-weight: 400;
   border-bottom: 0;
   padding: 12px 38px;
+  outline-offset: -1px;
 }
 
 .feds-localnav .feds-localnav-items .feds-navItem--centered {
   padding: 10px 20px;
 }
 
+.feds-localnav.active .feds-localnav-items {
+  box-sizing: border-box;
+  max-height: calc(100vh - (var(--global-height-nav) + var(--feds-localnav-height)));
+}
+
+.feds-localnav.active.is-sticky .feds-localnav-items {
+  max-height: calc(100vh - var(--feds-localnav-height));
+}
+
 .feds-localnav .feds-dropdown--active::before {
   display: none;
 }
 
+.feds-localnav .feds-localnav-exit {
+  display: none;
+}
+
 .feds-localnav.active .feds-localnav-title::after {
   transform: rotateZ(-135deg);
 }
 
 .feds-localnav.active .feds-localnav-curtain {
   width: 100%;
-  height: 100vh;
+  height: calc(100vh - (var(--feds-height-nav) + var(--feds-localnav-height)));
   position: absolute;
   background: var(--feds-color-black-v2);
   opacity: 0.7;
 }
 
+.feds-localnav.active.is-sticky .feds-localnav-curtain {
+  height: calc(100vh - var(--feds-localnav-height));
+}
+
+.feds-localnav.active .feds-localnav-exit {
+  display: block;
+}
+
 @keyframes slideright {
   from {
     translate: 0 0;
diff --git a/libs/blocks/global-navigation/global-navigation.js b/libs/blocks/global-navigation/global-navigation.js
index db9daed8ea9..0bf32070ff5 100644
--- a/libs/blocks/global-navigation/global-navigation.js
+++ b/libs/blocks/global-navigation/global-navigation.js
@@ -223,10 +223,10 @@ const decorateProfileTrigger = async ({ avatar }) => {
 };
 
 let keyboardNav;
-const setupKeyboardNav = async () => {
+const setupKeyboardNav = async (newMobileWithLnav) => {
   keyboardNav = keyboardNav || new Promise(async (resolve) => {
     const KeyboardNavigation = await loadBlock('./keyboard/index.js');
-    const instance = new KeyboardNavigation();
+    const instance = new KeyboardNavigation(newMobileWithLnav);
     resolve(instance);
   });
 };
@@ -331,10 +331,13 @@ class Gnav {
       this.ims,
       this.addChangeEventListeners,
     ];
+    const fetchKeyboardNav = () => {
+      setupKeyboardNav(this.newMobileNav && this.isLocalNav());
+    };
     this.block.addEventListener('click', this.loadDelayed);
-    this.block.addEventListener('keydown', setupKeyboardNav);
+    this.block.addEventListener('keydown', fetchKeyboardNav);
     setTimeout(this.loadDelayed, CONFIG.delays.loadDelayed);
-    setTimeout(setupKeyboardNav, CONFIG.delays.keyboardNav);
+    setTimeout(fetchKeyboardNav, CONFIG.delays.keyboardNav);
     for await (const task of tasks) {
       await yieldToMain();
       await task();
@@ -375,38 +378,50 @@ class Gnav {
     if (!this.isLocalNav()) return;
     const localNavItems = this.elements.navWrapper.querySelector('.feds-nav').querySelectorAll('.feds-navItem:not(.feds-navItem--section)');
     const [title, navTitle = ''] = this.getOriginalTitle(localNavItems);
+    let localNav = document.querySelector('.feds-localnav');
+    if (!localNav) {
+      lanaLog({ message: 'GNAV: Localnav does not include \'localnav\' in its name.', tags: 'errorType=info,module=gnav' });
+      localNav = toFragment`<div class="feds-localnav"/>`;
+      this.block.after(localNav);
+    }
+    localNav.append(toFragment`<button class="feds-navLink--hoverCaret feds-localnav-title" aria-haspopup="true" aria-expanded="false"></button>`, toFragment` <div class="feds-localnav-curtain"></div>`, toFragment` <div class="feds-localnav-items"></div>`, toFragment`<a href="#" class="feds-sr-only feds-localnav-exit">.</a>`);
 
-    if (this.elements.localNav || !this.newMobileNav || isDesktop.matches) {
-      localNavItems[0].querySelector('a').textContent = title.trim();
-    } else {
-      let localNav = document.querySelector('.feds-localnav');
-      if (!localNav) {
-        lanaLog({ message: 'GNAV: Localnav does not include \'localnav\' in its name.', tags: 'errorType=info,module=gnav' });
-        localNav = toFragment`<div class="feds-localnav"/>`;
-        this.block.after(localNav);
-      }
-      localNav.append(toFragment`<button class="feds-navLink--hoverCaret feds-localnav-title"></button>`, toFragment` <div class="feds-localnav-curtain"></div>`, toFragment` <div class="feds-localnav-items"></div>`);
-
-      const itemWrapper = localNav.querySelector('.feds-localnav-items');
-      const titleLabel = await replaceKey('overview', getFedsPlaceholderConfig());
+    const itemWrapper = localNav.querySelector('.feds-localnav-items');
+    const titleLabel = await replaceKey('overview', getFedsPlaceholderConfig());
 
-      localNavItems.forEach((elem, idx) => {
-        const clonedItem = elem.cloneNode(true);
-        const link = clonedItem.querySelector('a');
+    localNavItems.forEach((elem, idx) => {
+      const clonedItem = elem.cloneNode(true);
+      const link = clonedItem.querySelector('a');
 
-        if (idx === 0) {
-          localNav.querySelector('.feds-localnav-title').innerText = title.trim();
-          link.textContent = navTitle.trim() || titleLabel;
-        }
+      if (idx === 0) {
+        localNav.querySelector('.feds-localnav-title').innerText = title.trim();
+        link.textContent = navTitle.trim() || titleLabel;
+      }
 
-        itemWrapper.appendChild(clonedItem);
-      });
+      itemWrapper.appendChild(clonedItem);
+    });
 
-      localNav.querySelector('.feds-localnav-title').addEventListener('click', () => {
-        localNav.classList.toggle('active');
-      });
-      this.elements.localNav = localNav;
-    }
+    localNav.querySelector('.feds-localnav-title').addEventListener('click', () => {
+      localNav.classList.toggle('active');
+      const isActive = localNav.classList.contains('active');
+      localNav.querySelector('.feds-localnav-title').setAttribute('aria-expanded', isActive);
+    });
+    this.elements.localNav = localNav;
+    localNavItems[0].querySelector('a').textContent = title.trim();
+    const isAtTop = () => {
+      const rect = this.elements.localNav.getBoundingClientRect();
+      return rect.top === 0;
+    };
+    window.addEventListener('scroll', () => {
+      const classList = this.elements.localNav?.classList;
+      if (isAtTop()) {
+        if (!classList?.contains('is-sticky')) {
+          classList?.add('is-sticky');
+        }
+      } else {
+        classList?.remove('is-sticky');
+      }
+    });
   };
 
   decorateTopnavWrapper = async () => {
@@ -423,7 +438,9 @@ class Gnav {
       this.elements.topnavWrapper,
     );
 
-    this.decorateLocalNav();
+    if (this.newMobileNav) {
+      await this.decorateLocalNav();
+    }
   };
 
   addChangeEventListeners = () => {
@@ -454,7 +471,6 @@ class Gnav {
           this.elements.navWrapper.prepend(this.elements.breadcrumbsWrapper);
         }
       }
-      this.decorateLocalNav();
     });
 
     // Add a modifier when the nav is tangent to the viewport and content is partly hidden
@@ -1003,6 +1019,11 @@ class Gnav {
 
         elements.querySelectorAll('.feds-menu-headline').forEach((elem) => {
           // Reattach click event listener to headlines
+          elem?.setAttribute('role', 'button');
+          elem?.setAttribute('tabindex', 0);
+          elem?.removeAttribute('aria-level');
+          elem?.setAttribute('aria-haspopup', true);
+          elem?.setAttribute('aria-expanded', false);
           elem?.addEventListener('click', (e) => {
             trigger({ element: e.currentTarget, event: e, type: 'headline' });
             setActiveDropdown(e.currentTarget);
diff --git a/libs/blocks/global-navigation/utilities/keyboard/index.js b/libs/blocks/global-navigation/utilities/keyboard/index.js
index 204bac3f598..174095108d8 100644
--- a/libs/blocks/global-navigation/utilities/keyboard/index.js
+++ b/libs/blocks/global-navigation/utilities/keyboard/index.js
@@ -1,7 +1,7 @@
 /* eslint-disable class-methods-use-this */
 import { getNextVisibleItemPosition, getPreviousVisibleItemPosition, selectors } from './utils.js';
 import MainNav from './mainNav.js';
-import { closeAllDropdowns, lanaLog, logErrorFor } from '../utilities.js';
+import { closeAllDropdowns, lanaLog, logErrorFor, loadBlock } from '../utilities.js';
 
 const cycleOnOpenSearch = ({ e, isDesktop }) => {
   const withoutBreadcrumbs = [
@@ -73,16 +73,28 @@ const focusPrevProfileItem = ({ e }) => {
 };
 
 class KeyboardNavigation {
-  constructor() {
+  constructor(newNavWithLnav) {
     try {
       this.addEventListeners();
       this.mainNav = new MainNav();
+      if (newNavWithLnav) {
+        this.loadLnavNavigation();
+      }
       this.desktop = window.matchMedia('(min-width: 900px)');
     } catch (e) {
       lanaLog({ message: 'Keyboard Navigation failed to load', e, tags: 'errorType=error,module=gnav-keyboard' });
     }
   }
 
+  loadLnavNavigation = async () => {
+    this.localNav = this.localNav || new Promise((resolve) => {
+      loadBlock('./keyboard/localNav.js').then((LnavNavigation) => {
+        const instance = new LnavNavigation();
+        resolve(instance);
+      });
+    });
+  };
+
   addEventListeners = () => {
     [...document.querySelectorAll(`${selectors.globalNav}, ${selectors.globalFooter}`)]
       .forEach((el) => {
diff --git a/libs/blocks/global-navigation/utilities/keyboard/localNav.js b/libs/blocks/global-navigation/utilities/keyboard/localNav.js
new file mode 100644
index 00000000000..a161dc6323a
--- /dev/null
+++ b/libs/blocks/global-navigation/utilities/keyboard/localNav.js
@@ -0,0 +1,38 @@
+import { selectors } from './utils.js';
+import { trigger, setActiveDropdown } from '../utilities.js';
+
+class LocalNavItem {
+  constructor() {
+    this.localNav = document.querySelector(selectors.localNav);
+    this.localNavTrigger = this.localNav?.querySelector(selectors.localNavTitle);
+    this.exitLink = this.localNav?.querySelector(selectors.localNavExit);
+    this.addEventListeners();
+  }
+
+  static handleKeyDown = (e) => {
+    const isHeadline = e.target.classList.contains(selectors.headline.slice(1));
+    switch (e.code) {
+      case 'Space':
+      case 'Enter':
+        if (isHeadline) {
+          e.preventDefault(); // Prevent default scrolling behavior for Space key
+          trigger({ element: e.target, event: e, type: 'headline' });
+          setActiveDropdown(e.target);
+        }
+        break;
+      default:
+        break;
+    }
+  };
+
+  addEventListeners = () => {
+    this.localNav?.addEventListener('keydown', LocalNavItem.handleKeyDown);
+    this.exitLink?.addEventListener('focus', (e) => {
+      e.preventDefault();
+      this.localNavTrigger?.click();
+      this.localNavTrigger?.focus();
+    });
+  };
+}
+
+export default LocalNavItem;
diff --git a/libs/blocks/global-navigation/utilities/keyboard/utils.js b/libs/blocks/global-navigation/utilities/keyboard/utils.js
index 72d984f5bc2..40df16b67ed 100644
--- a/libs/blocks/global-navigation/utilities/keyboard/utils.js
+++ b/libs/blocks/global-navigation/utilities/keyboard/utils.js
@@ -38,6 +38,9 @@ const selectors = {
   activeTabpanel: '.tab-content [role="tabpanel"]',
   activeLinks: '.tab-content [role="tabpanel"]:not([hidden="true"]) a',
   stickyCta: 'header.new-nav .feds-popup .sticky-cta a',
+  localNav: '.feds-localnav',
+  localNavTitle: '.feds-localnav-title',
+  localNavExit: '.feds-localnav-exit',
 };
 
 selectors.profileDropdown = `
diff --git a/libs/blocks/global-navigation/utilities/utilities.js b/libs/blocks/global-navigation/utilities/utilities.js
index abf8881d9c8..6b961443df6 100644
--- a/libs/blocks/global-navigation/utilities/utilities.js
+++ b/libs/blocks/global-navigation/utilities/utilities.js
@@ -418,9 +418,9 @@ export const [setUserProfile, getUserProfile] = (() => {
 
 export const transformTemplateToMobile = async (popup, item, localnav = false) => {
   const notMegaMenu = popup.parentElement.tagName === 'DIV';
-  if (notMegaMenu) return null;
-
   const originalContent = popup.innerHTML;
+  if (notMegaMenu) return originalContent;
+
   const tabs = [...popup.querySelectorAll('.feds-menu-section')]
     .filter((section) => !section.querySelector('.feds-promo') && section.textContent)
     .map((section) => {
diff --git a/libs/styles/styles.css b/libs/styles/styles.css
index c90f72f9079..dfaab2db8f0 100644
--- a/libs/styles/styles.css
+++ b/libs/styles/styles.css
@@ -6,6 +6,7 @@
   /* stylelint-disable-next-line custom-property-pattern */
   --global-height-navPromo: 72px;
   --feds-totalheight-nav: calc(var(--feds-height-nav, --global-height-nav) + var(--feds-height-breadcrumbs, --global-height-breadcrumbs));
+  --feds-localnav-height: 40px;
 
   /* Colors */
   --link-color: #035fe6;
@@ -724,14 +725,31 @@ header.global-navigation a {
   text-decoration: unset;
 }
 
-.feds-localnav {
-  height: 40px;
+header.global-navigation + .feds-localnav {
+  display: block;
+  height: var(--feds-localnav-height);
+}
+
+.feds-sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
 }
 
 @media (min-width: 900px) {
   header.global-navigation.has-breadcrumbs {
     padding-bottom: var(--global-height-breadcrumbs);
   }
+
+  header.global-navigation + .feds-localnav {
+    display: none;
+  }
 }
 
 .breadcrumbs {