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fix(ListKeyManager): Unset activeItem if it is removed from items #20281

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fix(ListKeyManager): Unset activeItem if it is removed from items #20281

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12 changes: 12 additions & 0 deletions src/cdk/a11y/key-manager/list-key-manager.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -114,6 +114,18 @@ describe('Key managers', () => {
expect(keyManager.activeItem).toBeNull();
});

it('should reset the activeItem to null if it is removed from the QueryList', () => {
expect(keyManager.activeItemIndex).toBe(0);
expect(keyManager.activeItem!.getLabel()).toBe('one');

itemList.items.splice(0);
itemList.notifyOnChanges();

expect(keyManager.activeItemIndex).toBe(-1);
expect(keyManager.activeItem).toBeNull();

});

describe('Key events', () => {

it('should emit tabOut when the tab key is pressed', () => {
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3 changes: 3 additions & 0 deletions src/cdk/a11y/key-manager/list-key-manager.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,9 @@ export class ListKeyManager<T extends ListKeyManagerOption> {

if (newIndex > -1 && newIndex !== this._activeItemIndex) {
this._activeItemIndex = newIndex;
} else {
this._activeItemIndex = -1;
this._activeItem = null;
}
}
});
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