feat(menu): highlight active items

client/src/plus/utils.ts

@@ -16,7 +16,7 @@ export function usePlusUrl(): string {
   let target = `/${locale}/plus`;
 
   if (normalizedUrl(target) === normalizedUrl(pathname)) {
-    target = "#subscribe";
+    target += "#subscribe";
   }
 
   return target;

client/src/ui/_vars.scss

@@ -154,6 +154,7 @@ $mdn-color-ads: #00d0aa;
 
 $mdn-theme-light-text-primary: $mdn-color-neutral-90;
 $mdn-theme-light-text-secondary: $mdn-color-neutral-70;
+$mdn-theme-light-text-active: #{$mdn-color-neutral-50};
 $mdn-theme-light-text-inactive: #{$mdn-color-neutral-40}a6;
 $mdn-theme-light-text-link: $mdn-color-light-theme-blue-60;
 $mdn-theme-light-text-invert: $mdn-color-white;
@@ -200,6 +201,7 @@ $mdn-theme-light-code-background-block: $mdn-color-neutral-light-80;
 
 $mdn-theme-dark-text-primary: $mdn-color-white;
 $mdn-theme-dark-text-secondary: $mdn-color-neutral-20;
+$mdn-theme-dark-text-active: #{$mdn-color-neutral-50};
 $mdn-theme-dark-text-inactive: #{$mdn-color-neutral-20}a6;
 $mdn-theme-dark-text-link: $mdn-color-dark-theme-blue-30;
 $mdn-theme-dark-text-invert: $mdn-color-neutral-90;

client/src/ui/base/_themes.scss

@@ -5,6 +5,7 @@
 @mixin light-theme {
   --text-primary: #{$mdn-theme-light-text-primary};
   --text-secondary: #{$mdn-theme-light-text-secondary};
+  --text-active: #{$mdn-theme-light-text-active};
   --text-inactive: #{$mdn-theme-light-text-inactive};
   --text-link: #{$mdn-theme-light-text-link};
   --text-visited: #551a8b; // Source: https://searchfox.org/mozilla-central/rev/02841791400cf7cf5760c0cfaf31f5d772624253/modules/libpref/init/StaticPrefList.yaml#1787-1790
@@ -204,6 +205,7 @@
 @mixin dark-theme {
   --text-primary: #{$mdn-theme-dark-text-primary};
   --text-secondary: #{$mdn-theme-dark-text-secondary};
+  --text-active: #{$mdn-theme-dark-text-active};
   --text-inactive: #{$mdn-theme-dark-text-inactive};
   --text-link: #{$mdn-theme-dark-text-link};
   --text-visited: #ffadff; // Source: https://searchfox.org/mozilla-central/rev/02841791400cf7cf5760c0cfaf31f5d772624253/modules/libpref/init/StaticPrefList.yaml#1794-1797

client/src/ui/molecules/main-menu/index.tsx

@@ -9,6 +9,7 @@ import { PLUS_IS_ENABLED } from "../../../env";
 import { useLocale } from "../../../hooks";
 import { useGleanClick } from "../../../telemetry/glean-context";
 import { MENU } from "../../../telemetry/constants";
+import { useLocation } from "react-router";
 
 export default function MainMenu({ isOpenOnMobile }) {
   const locale = useLocale();
@@ -83,7 +84,7 @@ export default function MainMenu({ isOpenOnMobile }) {
         )}
         <TopLevelMenuLink to="/en-US/blog/">Blog</TopLevelMenuLink>
         <TopLevelMenuLink to={`/${locale}/play`}>Play</TopLevelMenuLink>
-        <TopLevelMenuLink to="/en-US/plus/ai-help/">
+        <TopLevelMenuLink to="/en-US/plus/ai-help">
           AI Help <sup className="new beta">Beta</sup>
         </TopLevelMenuLink>
       </ul>
@@ -98,9 +99,13 @@ function TopLevelMenuLink({
   to: string;
   children: React.ReactNode;
 }) {
+  const { pathname } = useLocation();
   const gleanClick = useGleanClick();
+
+  const isActive = pathname.startsWith(to.split("#", 2)[0]);
+
   return (
-    <li className="top-level-entry-container">
+    <li className={`top-level-entry-container ${isActive ? "active" : ""}`}>
       <a
         className="top-level-entry menu-link"
         href={to}

client/src/ui/molecules/menu/index.scss

@@ -1,4 +1,16 @@
 .top-level-entry-container {
+  &.active > a {
+    &:link,
+    &:visited {
+      color: var(--text-active);
+    }
+
+    &:hover,
+    &:active {
+      color: var(--category-color);
+    }
+  }
+
   .top-level-entry-dot ~ .top-level-entry::after {
     background: var(--text-primary-blue);
     border: 1px solid var(--background-primary);

client/src/ui/molecules/menu/index.tsx

@@ -1,24 +1,39 @@
+import { useLocation } from "react-router";
 import { MENU } from "../../../telemetry/constants";
 import { useGleanClick } from "../../../telemetry/glean-context";
 import { MenuEntry, Submenu } from "../submenu";
 import "./index.scss";
 
 interface MenuProps {
   menu: MenuEntry;
+  isActive?: boolean;
   isOpen: boolean;
   toggle: (id: string) => void;
 }
 
-export const Menu = ({ menu, isOpen, toggle }: MenuProps) => {
+export const Menu = ({
+  menu,
+  isActive = undefined,
+  isOpen,
+  toggle,
+}: MenuProps) => {
+  const { pathname } = useLocation();
   const gleanClick = useGleanClick();
 
   const buttonId = `${menu.id}-button`;
   const submenuId = `${menu.id}-menu`;
 
+  isActive =
+    isActive ??
+    (typeof menu.to === "string" &&
+      pathname.startsWith(menu.to.split("#", 2)[0]));
   const hasAnyDot = menu.items.some((item) => item.dot);
 
   return (
-    <li key={menu.id} className="top-level-entry-container">
+    <li
+      key={menu.id}
+      className={`top-level-entry-container ${isActive ? "active" : ""}`}
+    >
       {hasAnyDot && (
         <span className="visually-hidden top-level-entry-dot"></span>
       )}

client/src/ui/molecules/plus-menu/index.tsx

@@ -5,6 +5,7 @@ import { useIsServer, useLocale, useViewedState } from "../../../hooks";
 import { useUserData } from "../../../user-context";
 import { MenuEntry } from "../submenu";
 import { FeatureId } from "../../../constants";
+import { useLocation } from "react-router";
 
 export const PlusMenu = ({ visibleSubMenuId, toggleMenu }) => {
   const plusUrl = usePlusUrl();
@@ -15,6 +16,13 @@ export const PlusMenu = ({ visibleSubMenuId, toggleMenu }) => {
 
   const { isViewed } = useViewedState();
 
+  // Avoid that "Plus" and "AI Help" are both active.
+  const { pathname } = useLocation();
+  const aiHelpUrl = `/${locale}/plus/ai-help`;
+  const isActive =
+    pathname.startsWith(plusUrl.split("#", 2)[0]) &&
+    !pathname.startsWith(aiHelpUrl);
+
   const plusMenu: MenuEntry = {
     label: "Plus",
     id: "mdn-plus",
@@ -32,7 +40,7 @@ export const PlusMenu = ({ visibleSubMenuId, toggleMenu }) => {
         hasIcon: true,
         iconClasses: "submenu-icon",
         label: "AI Help (beta)",
-        url: `/${locale}/plus/ai-help`,
+        url: aiHelpUrl,
       },
       ...(!isServer && isAuthenticated
         ? [
@@ -75,5 +83,12 @@ export const PlusMenu = ({ visibleSubMenuId, toggleMenu }) => {
   };
   const isOpen = visibleSubMenuId === plusMenu.id;
 
-  return <Menu menu={plusMenu} isOpen={isOpen} toggle={toggleMenu} />;
+  return (
+    <Menu
+      menu={plusMenu}
+      isActive={isActive}
+      isOpen={isOpen}
+      toggle={toggleMenu}
+    />
+  );
 };