feat: skippable discussion list pane

framework/core/js/src/common/Application.tsx

@@ -39,6 +39,7 @@ import IExtender from './extenders/IExtender';
 import AccessToken from './models/AccessToken';
 import SearchManager from './SearchManager';
 import { ColorScheme } from './components/ThemeMode';
+import { prepareSkipLinks } from './utils/a11y';
 
 export type FlarumScreens = 'phone' | 'tablet' | 'desktop' | 'desktop-hd';
 
@@ -394,6 +395,8 @@ export default class Application {
     this.initColorScheme();
 
     liveHumanTimes();
+
+    prepareSkipLinks();
   }
 
   private initColorScheme(forumDefault: string | null = null): void {

framework/core/js/src/common/components/Dropdown.tsx

@@ -124,12 +124,13 @@ export default class Dropdown<CustomAttrs extends IDropdownAttrs = IDropdownAttr
       m.redraw();
     });
 
-    // Focusing out of the dropdown should close it.
+    this.$().on('focusout', (e: JQuery.FocusOutEvent) => {
-    this.$().on('focusout', (e) => {
+      // Check if the new focused element is outside of this dropdown
-      if (e.relatedTarget && !this.$().has(e.relatedTarget).length) {
+      if (!this.$().has(e.relatedTarget as Element).length) {
         this.$().trigger('hidden.bs.dropdown');
       }
     });
+    // Focusing out of the dropdown should close it.
   }
 
   /**

framework/core/js/src/common/utils/a11y.ts

@@ -0,0 +1,22 @@
+/**
+ * Fix a11y skip links by manually focusing on the href target element.
+ * This prevents unwanted/unexpected reloads of the page.
+ */
+export function prepareSkipLinks() {
+  document.querySelectorAll('.sr-only-focusable-custom:not([data-prepared])').forEach((el) => {
+    el.addEventListener('click', function (e) {
+      e.preventDefault();
+      console.log('intercepted');
+      const target = el.getAttribute('href')!;
+      const $target = document.querySelector(target) as HTMLElement;
+
+      if ($target) {
+        $target.setAttribute('tabindex', '-1');
+        $target.focus();
+        $target.removeAttribute('tabindex');
+
+        $target.dataset.prepared = 'true';
+      }
+    });
+  });
+}

framework/core/js/src/forum/components/DiscussionListPane.js

@@ -2,6 +2,7 @@ import app from '../../forum/app';
 import DiscussionList from './DiscussionList';
 import Component from '../../common/Component';
 import DiscussionPage from './DiscussionPage';
+import { prepareSkipLinks } from '../../common/utils/a11y';
 
 const hotEdge = (e) => {
   if (e.pageX < 10) app.pane.show();
@@ -22,7 +23,14 @@ export default class DiscussionListPane extends Component {
       return;
     }
 
-    return <aside className="DiscussionListPane">{this.enoughSpace() && <DiscussionList state={this.attrs.state} />}</aside>;
+    return (
+      <aside className="DiscussionListPane">
+        <a href="#page-main" class="sr-only sr-only-focusable-custom" oncreate={() => prepareSkipLinks()}>
+          {app.translator.trans('core.forum.discussion_list.skip_discussion_list_pane')}
+        </a>
+        {this.enoughSpace() && <DiscussionList state={this.attrs.state} />}
+      </aside>
+    );
   }
 
   oncreate(vnode) {
@@ -34,7 +42,12 @@ export default class DiscussionListPane extends Component {
     // and hide the pane respectively. We also create a 10px 'hot edge' on the
     // left of the screen to activate the pane.
     const pane = app.pane;
-    $list.hover(pane.show.bind(pane), pane.onmouseleave.bind(pane));
+    $list.on('mouseenter', pane.show.bind(pane));
+    $list.on('mouseleave', pane.onmouseleave.bind(pane));
+    // a11y: when tabbing into the pane (focus) we should also show the pane.
+    // and when tabbing out, we should hide the pane.
+    $list.on('focus', 'a, .Button', pane.show.bind(pane));
+    $list.on('blur', 'a, .Button', pane.onmouseleave.bind(pane));
 
     $(document).on('mousemove', hotEdge);
 

framework/core/js/src/forum/components/PageStructure.tsx

@@ -5,6 +5,7 @@ import type Mithril from 'mithril';
 import classList from '../../common/utils/classList';
 import ItemList from '../../common/utils/ItemList';
 import LoadingIndicator from '../../common/components/LoadingIndicator';
+import { prepareSkipLinks } from '../../common/utils/a11y';
 
 export interface PageStructureAttrs extends ComponentAttrs {
   hero?: () => Mithril.Children;
@@ -52,7 +53,11 @@ export default class PageStructure<CustomAttrs extends PageStructureAttrs = Page
   }
 
   main(): Mithril.Children {
-    return <div className="Page-main">{this.attrs.loading ? this.loadingItems().toArray() : this.mainItems().toArray()}</div>;
+    return (
+      <div className="Page-main" id="page-main">
+        {this.attrs.loading ? this.loadingItems().toArray() : this.mainItems().toArray()}
+      </div>
+    );
   }
 
   containerItems(): ItemList<Mithril.Children> {
@@ -73,7 +78,7 @@ export default class PageStructure<CustomAttrs extends PageStructureAttrs = Page
 
     items.add(
       'skipToMainContent',
-      <a href="#main-content" className="sr-only sr-only-focusable-custom">
+      <a href="#main-content" className="sr-only sr-only-focusable-custom" oncreate={() => prepareSkipLinks()}>
         {app.translator.trans('core.forum.index.skip_to_main_content')}
       </a>,
       200

framework/core/locale/core.yml

@@ -459,6 +459,7 @@ core:
       empty_text: It looks as though there are no discussions here.
       load_more_button: => core.ref.load_more
       replied_text: "{username} replied {ago}"
+      skip_discussion_list_pane: Skip the discussion list pane
       started_text: "{username} started {ago}"
       total_replies_a11y_label: "{count, plural, one {# reply} other {# replies}}"
       unread_replies_a11y_label: "{count, plural, one {# unread reply} other {# unread replies}}. Mark unread {count, plural, one {reply} other {replies}} as read."