fix: (CXSPA-1128) - NgSelect double stop on mobile alternative fix

projects/storefrontlib/shared/components/ng-select-a11y/ng-select-a11y.directive.spec.ts

@@ -6,22 +6,23 @@ import { FeatureConfigService, TranslationService } from '@spartacus/core';
 import { of } from 'rxjs';
 import { NgSelectA11yDirective } from './ng-select-a11y.directive';
 import { NgSelectA11yModule } from './ng-select-a11y.module';
+import { BreakpointService } from '@spartacus/storefront';
 
 @Component({
   template: `
     <ng-select
       [searchable]="isSearchable"
       [cxNgSelectA11y]="{ ariaLabel: 'Size', ariaControls: 'size-results' }"
+      [items]="[1, 2, 3]"
+      [(ngModel)]="selected"
     >
-      <ng-option *ngFor="let val of [1, 2, 3]" [value]="val">{{
-        val
-      }}</ng-option>
     </ng-select>
     <div id="size-results"></div>
   `,
 })
 class MockComponent {
   isSearchable: boolean = false;
+  selected = 1;
 }
 
 class MockFeatureConfigService {
@@ -39,6 +40,7 @@ class MockTranslationService {
 describe('NgSelectA11yDirective', () => {
   let component: MockComponent;
   let fixture: ComponentFixture<MockComponent>;
+  let breakpointService: BreakpointService;
 
   beforeEach(() => {
     TestBed.configureTestingModule({
@@ -51,8 +53,8 @@ describe('NgSelectA11yDirective', () => {
     }).compileComponents();
 
     fixture = TestBed.createComponent(MockComponent);
-
     component = fixture.componentInstance;
+    breakpointService = TestBed.inject(BreakpointService);
   });
 
   function getNgSelect(): DebugElement {
@@ -65,12 +67,10 @@ describe('NgSelectA11yDirective', () => {
 
     const select = getNgSelect().nativeElement;
     const innerDiv = select.querySelector("[role='combobox']");
-    const inputElement = select.querySelector('input');
 
     expect(innerDiv).toBeTruthy();
     expect(innerDiv.getAttribute('aria-controls')).toEqual('size-results');
     expect(innerDiv.getAttribute('aria-label')).toEqual('Size');
-    expect(inputElement.getAttribute('aria-hidden')).toEqual('true');
   });
 
   it('should append aria-label to options', (done) => {
@@ -91,4 +91,28 @@ describe('NgSelectA11yDirective', () => {
       done();
     });
   });
+
+  it('should append value to aria-label and hide the value element from screen reader on mobile', (done) => {
+    const isDownSpy = spyOn(breakpointService, 'isDown').and.returnValue(
+      of(true)
+    );
+    fixture.detectChanges();
+    const ngSelectInstance = getNgSelect().componentInstance;
+    ngSelectInstance.writeValue(component.selected);
+    ngSelectInstance.detectChanges();
+
+    // Wait for the mutation observer to update the aria-label
+    setTimeout(() => {
+      const select = getNgSelect().nativeElement;
+      const valueElement = select.querySelector('.ng-value');
+      const divCombobox = select.querySelector("[role='combobox']");
+
+      expect(valueElement.getAttribute('aria-hidden')).toEqual('true');
+      expect(divCombobox.getAttribute('aria-label')).toContain(
+        `, ${component.selected}`
+      );
+      isDownSpy.and.callThrough();
+      done();
+    });
+  });
 });

projects/storefrontlib/shared/components/ng-select-a11y/ng-select-a11y.directive.ts

@@ -11,10 +11,14 @@ import {
   HostListener,
   inject,
   Input,
+  Optional,
   Renderer2,
 } from '@angular/core';
 import { FeatureConfigService, TranslationService } from '@spartacus/core';
-import { take } from 'rxjs';
+import { filter, take } from 'rxjs';
+import { BREAKPOINT, BreakpointService } from '../../../layout';
+
+const ARIA_LABEL = 'aria-label';
 
 @Directive({
   selector: '[cxNgSelectA11y]',
@@ -41,6 +45,8 @@ export class NgSelectA11yDirective implements AfterViewInit {
     observer.observe(this.elementRef.nativeElement, { childList: true });
   }
 
+  @Optional() breakpointService = inject(BreakpointService, { optional: true });
+
   constructor(
     private renderer: Renderer2,
     private elementRef: ElementRef
@@ -56,7 +62,7 @@ export class NgSelectA11yDirective implements AfterViewInit {
     const ariaControls = this.cxNgSelectA11y.ariaControls ?? elementId;
 
     if (ariaLabel) {
-      this.renderer.setAttribute(divCombobox, 'aria-label', ariaLabel);
+      this.renderer.setAttribute(divCombobox, ARIA_LABEL, ariaLabel);
     }
 
     if (ariaControls) {
@@ -67,7 +73,18 @@ export class NgSelectA11yDirective implements AfterViewInit {
       this.featureConfigService.isEnabled('a11yNgSelectMobileReadout') &&
       inputElement.readOnly
     ) {
-      this.renderer.setAttribute(inputElement, 'aria-hidden', 'true');
+      this.breakpointService
+        ?.isDown(BREAKPOINT.md)
+        .pipe(filter(Boolean), take(1))
+        .subscribe(() => {
+          const selectObserver = new MutationObserver((changes, observer) => {
+            this.appendValueToAriaLabel(changes, observer, divCombobox);
+          });
+          selectObserver.observe(this.elementRef.nativeElement, {
+            subtree: true,
+            characterData: true,
+          });
+        });
     }
   }
 
@@ -85,11 +102,36 @@ export class NgSelectA11yDirective implements AfterViewInit {
           options.forEach(
             (option: HTMLOptionElement, index: string | number) => {
               const ariaLabel = `${option.innerText}, ${+index + 1} ${translation} ${options.length}`;
-              this.renderer.setAttribute(option, 'aria-label', ariaLabel);
+              this.renderer.setAttribute(option, ARIA_LABEL, ariaLabel);
             }
           );
         });
     }
     observerInstance.disconnect();
   }
+
+  /**
+   * Hides the input value from the screen reader and provides it as part of the aria-label instead.
+   * This improves the screen reader output on mobile devices.
+   */
+  appendValueToAriaLabel(
+    _changes: any,
+    observer: MutationObserver,
+    divCombobox: HTMLElement
+  ) {
+    const valueLabel =
+      this.elementRef.nativeElement.querySelector('.ng-value-label')?.innerText;
+    if (valueLabel) {
+      const comboboxAriaLabel = divCombobox?.getAttribute(ARIA_LABEL) || '';
+      const valueElement =
+        this.elementRef.nativeElement.querySelector('.ng-value');
+      this.renderer.setAttribute(valueElement, 'aria-hidden', 'true');
+      this.renderer.setAttribute(
+        divCombobox,
+        ARIA_LABEL,
+        comboboxAriaLabel + ', ' + valueLabel
+      );
+    }
+    observer.disconnect();
+  }
 }