fix(NcSidebarTab): Ensure there is an aria-label if the `aria-label…

…ledby` element does not exist

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

src/components/NcAppSidebar/NcAppSidebarTabs.vue

@@ -36,8 +36,8 @@
 			@keydown.tab.exact.prevent.stop="focusActiveTabContent"
 			@keydown.home.exact.prevent.stop="focusFirstTab"
 			@keydown.end.exact.prevent.stop="focusLastTab"
-			@keydown.33.exact.prevent.stop="focusFirstTab"
-			@keydown.34.exact.prevent.stop="focusLastTab">
+			@keydown.page-up.exact.prevent.stop="focusFirstTab"
+			@keydown.page-down.exact.prevent.stop="focusLastTab">
 			<NcCheckboxRadioSwitch v-for="tab in tabs"
 				:key="tab.id"
 				:aria-controls="`tab-${tab.id}`"
@@ -90,6 +90,8 @@ export default {
 			unregisterTab: this.unregisterTab,
 			// Getter as an alternative to Vue 2.7 computed(() => this.activeTab)
 			getActiveTab: () => this.activeTab,
+			// Used to check whether the tab header is shown so the tabs can reference the tab header for `aria-labelledby` or not
+			tablistShown: () => this.hasMultipleTabs,
 		}
 	},
 

src/components/NcAppSidebarTab/NcAppSidebarTab.vue

@@ -27,7 +27,8 @@
 	<section :id="`tab-${id}`"
 		:class="{'app-sidebar__tab--active': isActive}"
 		:aria-hidden="!isActive"
-		:aria-labelledby="`tab-button-${id}`"
+		:aria-label="tablistShown() ? undefined : name"
+		:aria-labelledby="tablistShown() ? `tab-button-${id}` : undefined"
 		class="app-sidebar__tab"
 		tabindex="0"
 		role="tabpanel"
@@ -44,7 +45,7 @@
 export default {
 	name: 'NcAppSidebarTab',
 
-	inject: ['registerTab', 'unregisterTab', 'getActiveTab'],
+	inject: ['registerTab', 'unregisterTab', 'getActiveTab', 'tablistShown'],
 
 	props: {
 		id: {