Fixed #15830 - Accessibility: Tree inside an Accordion (arrow navigat…

…ion)

src/app/components/accordion/accordion.ts

@@ -230,11 +230,7 @@ export class AccordionTab implements AfterContentInit, OnDestroy {
 
     accordion: Accordion;
 
-    constructor(
-        @Inject(forwardRef(() => Accordion)) accordion: Accordion,
-        public el: ElementRef,
-        public changeDetector: ChangeDetectorRef
-    ) {
+    constructor(@Inject(forwardRef(() => Accordion)) accordion: Accordion, public el: ElementRef, public changeDetector: ChangeDetectorRef) {
         this.accordion = accordion as Accordion;
         this.id = UniqueComponentId();
     }
@@ -441,10 +437,7 @@ export class Accordion implements BlockableUI, AfterContentInit, OnDestroy {
 
     public tabs: AccordionTab[] = [];
 
-    constructor(
-        public el: ElementRef,
-        public changeDetector: ChangeDetectorRef
-    ) {}
+    constructor(public el: ElementRef, public changeDetector: ChangeDetectorRef) {}
 
     @HostListener('keydown', ['$event'])
     onKeydown(event) {
@@ -481,8 +474,12 @@ export class Accordion implements BlockableUI, AfterContentInit, OnDestroy {
         return tagName?.toLowerCase() === 'textarea';
     }
 
+    focusedElementIsAccordionHeader() {
+        return document.activeElement.tagName.toLowerCase() === 'a' && document.activeElement.classList.contains('p-accordion-header-link');
+    }
+
     onTabArrowDownKey(event) {
-        if (!this.isInput(event) && !this.isTextArea(event)) {
+        if (!this.isInput(event) && !this.isTextArea(event) && this.focusedElementIsAccordionHeader()) {
             const nextHeaderAction = this.findNextHeaderAction(event.target.parentElement.parentElement.parentElement);
             nextHeaderAction ? this.changeFocusedTab(nextHeaderAction) : this.onTabHomeKey(event);
 
@@ -491,7 +488,7 @@ export class Accordion implements BlockableUI, AfterContentInit, OnDestroy {
     }
 
     onTabArrowUpKey(event) {
-        if (!this.isInput(event) && !this.isTextArea(event)) {
+        if (!this.isInput(event) && !this.isTextArea(event) && this.focusedElementIsAccordionHeader()) {
             const prevHeaderAction = this.findPrevHeaderAction(event.target.parentElement.parentElement.parentElement);
             prevHeaderAction ? this.changeFocusedTab(prevHeaderAction) : this.onTabEndKey(event);