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chore: add polyfill for Firefox ElementInternals aria
PiperOrigin-RevId: 563194223
This commit is contained in:
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01a99a5cc3
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@ -4,6 +4,8 @@
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* SPDX-License-Identifier: Apache-2.0
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*/
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import {isServer, ReactiveElement} from 'lit';
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/**
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* Accessibility Object Model reflective aria property name types.
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*/
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@ -178,3 +180,185 @@ export type ARIARole =
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'doc-glossary'|'doc-glossref'|'doc-index'|'doc-introduction'|'doc-noteref'|
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'doc-notice'|'doc-pagebreak'|'doc-pagelist'|'doc-part'|'doc-preface'|
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'doc-prologue'|'doc-pullquote'|'doc-qna'|'doc-subtitle'|'doc-tip'|'doc-toc';
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/**
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* Enables a host custom element to be the target for aria roles and attributes.
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* Components should set the `elementInternals.role` property.
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*
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* By default, aria components are tab focusable. Provide a `focusable: false`
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* option for components that should not be tab focusable, such as
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* `role="listbox"`.
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*
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* This function will also polyfill aria `ElementInternals` properties for
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* Firefox.
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*
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* @param ctor The `ReactiveElement` constructor to set up.
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* @param options Options to configure the element's host aria.
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*/
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export function setupHostAria(
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ctor: typeof ReactiveElement, {focusable}: SetupHostAriaOptions = {}) {
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if (focusable !== false) {
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ctor.addInitializer(host => {
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host.addController({
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hostConnected() {
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if (host.hasAttribute('tabindex')) {
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return;
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}
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host.tabIndex = 0;
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}
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});
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});
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}
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if (isServer || 'role' in Element.prototype) {
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return;
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}
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// Polyfill reflective aria properties for Firefox
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for (const ariaProperty of ARIA_PROPERTIES) {
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ctor.createProperty(ariaProperty, {
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attribute: ariaPropertyToAttribute(ariaProperty),
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reflect: true,
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});
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}
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ctor.createProperty('role', {reflect: true});
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}
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/**
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* Options for setting up a host element as an aria target.
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*/
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export interface SetupHostAriaOptions {
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/**
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* Whether or not the element can be focused with the tab key. Defaults to
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* true.
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*
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* Set this to false for aria roles that should not be tab focusable, such as
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* `role="listbox"`.
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*/
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focusable?: boolean;
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}
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/**
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* Polyfills an element and its `ElementInternals` to support `ARIAMixin`
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* properties on internals. This is needed for Firefox.
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*
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* `setupHostAria()` must be called for the element class.
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*
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* @example
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* class XButton extends LitElement {
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* static {
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* setupHostAria(XButton);
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* }
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*
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* private internals =
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* polyfillElementInternalsAria(this, this.attachInternals());
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*
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* constructor() {
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* super();
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* this.internals.role = 'button';
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* }
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* }
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*/
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export function polyfillElementInternalsAria(
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host: ReactiveElement, internals: ElementInternals) {
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if (checkIfElementInternalsSupportsAria(internals)) {
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return internals;
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}
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if (!('role' in host)) {
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throw new Error('Missing setupHostAria()');
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}
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let firstConnectedCallbacks: Array<() => void> = [];
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let hasBeenConnected = false;
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// Add support for Firefox, which has not yet implement ElementInternals aria
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for (const ariaProperty of ARIA_PROPERTIES) {
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let ariaValueBeforeConnected: string|null = null;
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Object.defineProperty(internals, ariaProperty, {
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enumerable: true,
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configurable: true,
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get() {
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if (!hasBeenConnected) {
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return ariaValueBeforeConnected;
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}
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// Dynamic lookup rather than hardcoding all properties.
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// tslint:disable-next-line:no-dict-access-on-struct-type
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return host[ariaProperty];
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},
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set(value: string|null) {
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const setValue = () => {
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// Dynamic lookup rather than hardcoding all properties.
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// tslint:disable-next-line:no-dict-access-on-struct-type
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host[ariaProperty] = value;
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};
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if (!hasBeenConnected) {
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ariaValueBeforeConnected = value;
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firstConnectedCallbacks.push(setValue);
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return;
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}
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setValue();
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},
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});
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}
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let roleValueBeforeConnected: string|null = null;
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Object.defineProperty(internals, 'role', {
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enumerable: true,
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configurable: true,
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get() {
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if (!hasBeenConnected) {
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return roleValueBeforeConnected;
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}
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return host.getAttribute('role');
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},
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set(value: string|null) {
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const setRole = () => {
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if (value === null) {
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host.removeAttribute('role');
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} else {
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host.setAttribute('role', value);
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}
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};
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if (!hasBeenConnected) {
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roleValueBeforeConnected = value;
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firstConnectedCallbacks.push(setRole);
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return;
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}
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setRole();
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},
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});
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host.addController({
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hostConnected() {
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if (hasBeenConnected) {
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return;
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}
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hasBeenConnected = true;
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for (const callback of firstConnectedCallbacks) {
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callback();
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}
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// Remove strong callback references
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firstConnectedCallbacks = [];
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}
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});
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return internals;
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}
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// Separate function so that typescript doesn't complain about internals being
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// "never".
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function checkIfElementInternalsSupportsAria(internals: ElementInternals) {
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return 'role' in internals;
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}
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@ -6,7 +6,10 @@
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// import 'jasmine'; (google3-only)
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import {ARIAProperty, ariaPropertyToAttribute, isAriaAttribute} from './aria.js';
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import {html, LitElement} from 'lit';
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import {customElement} from 'lit/decorators.js';
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import {ARIAProperty, ariaPropertyToAttribute, isAriaAttribute, polyfillElementInternalsAria, setupHostAria} from './aria.js';
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describe('aria', () => {
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describe('isAriaAttribute()', () => {
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@ -41,4 +44,216 @@ describe('aria', () => {
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.toBe('aria-labelledby');
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});
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});
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describe('setupHostAria()', () => {
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@customElement('test-setup-aria-host')
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class TestElement extends LitElement {
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static {
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setupHostAria(TestElement);
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}
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override render() {
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return html`<slot></slot>`;
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}
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}
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it('should not hydrate tabindex attribute on creation', () => {
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const element = new TestElement();
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expect(element.hasAttribute('tabindex'))
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.withContext('has tabindex attribute')
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.toBeFalse();
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});
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it('should set tabindex="0" on element once connected', () => {
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const element = new TestElement();
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document.body.appendChild(element);
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expect(element.getAttribute('tabindex'))
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.withContext('tabindex attribute value')
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.toEqual('0');
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element.remove();
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});
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it('should not set tabindex on connected if one already exists', () => {
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const element = new TestElement();
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element.tabIndex = -1;
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document.body.appendChild(element);
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expect(element.getAttribute('tabindex'))
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.withContext('tabindex attribute value')
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.toEqual('-1');
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element.remove();
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});
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it('should not change tabindex if disconnected and reconnected', () => {
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const element = new TestElement();
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document.body.appendChild(element);
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element.tabIndex = -1;
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element.remove();
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document.body.appendChild(element);
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expect(element.getAttribute('tabindex'))
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.withContext('tabindex attribute value')
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.toEqual('-1');
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});
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if (!('role' in Element.prototype)) {
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describe('polyfill', () => {
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it('should hydrate aria attributes when ARIAMixin is not supported',
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async () => {
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const element = new TestElement();
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document.body.appendChild(element);
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element.role = 'button';
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await element.updateComplete;
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expect(element.getAttribute('role'))
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.withContext('role attribute value')
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.toEqual('button');
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element.remove();
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});
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});
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}
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});
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describe('polyfillElementInternalsAria()', () => {
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@customElement('test-polyfill-element-internals-aria')
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class TestElement extends LitElement {
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static {
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setupHostAria(TestElement);
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}
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internals = polyfillElementInternalsAria(this, this.attachInternals());
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constructor() {
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super();
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this.internals.role = 'button';
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}
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override render() {
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return html`<slot></slot>`;
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}
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}
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if ('role' in ElementInternals.prototype) {
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it('should not hydrate attributes when role set', () => {
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const element = new TestElement();
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document.body.appendChild(element);
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expect(element.hasAttribute('role'))
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.withContext('has role attribute')
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.toBeFalse();
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element.remove();
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});
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} else {
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it('should preserve role values when set before connected', () => {
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const element = new TestElement();
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// TestElement() sets role in constructor
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expect(element.internals.role)
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.withContext('ElementInternals.role')
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.toEqual('button');
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});
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it('should preserve aria values when set before connected', () => {
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const element = new TestElement();
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element.internals.ariaLabel = 'Foo';
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expect(element.internals.ariaLabel)
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.withContext('ElementInternals.ariaLabel')
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.toEqual('Foo');
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});
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it('should hydrate role attributes when set before connection',
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async () => {
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const element = new TestElement();
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// TestElement() sets role in constructor
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document.body.appendChild(element);
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await element.updateComplete;
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expect(element.getAttribute('role'))
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.withContext('role attribute value')
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.toEqual('button');
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element.remove();
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});
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it('should hydrate aria attributes when set before connection',
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async () => {
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const element = new TestElement();
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element.internals.ariaLabel = 'Foo';
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document.body.appendChild(element);
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await element.updateComplete;
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expect(element.getAttribute('aria-label'))
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.withContext('aria-label attribute value')
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.toEqual('Foo');
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element.remove();
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});
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it('should set aria attributes when set after connection', async () => {
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const element = new TestElement();
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document.body.appendChild(element);
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element.internals.ariaLabel = 'Value after construction';
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await element.updateComplete;
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expect(element.getAttribute('aria-label'))
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.withContext('aria-label attribute value')
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.toEqual('Value after construction');
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element.remove();
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});
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it('should handle setting role multiple times before connection',
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async () => {
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const element = new TestElement();
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element.internals.role = 'button';
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element.internals.role = 'checkbox';
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expect(element.internals.role)
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.withContext('internals.role before connection')
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.toEqual('checkbox');
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document.body.appendChild(element);
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await element.updateComplete;
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expect(element.internals.role)
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.withContext('internals.role after connection')
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.toEqual('checkbox');
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element.remove();
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});
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it('should handle setting aria properties multiple times before connection',
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async () => {
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const element = new TestElement();
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element.internals.ariaLabel = 'First';
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element.internals.ariaLabel = 'Second';
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expect(element.internals.ariaLabel)
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.withContext('internals.ariaLabel before connection')
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.toEqual('Second');
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document.body.appendChild(element);
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await element.updateComplete;
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expect(element.internals.ariaLabel)
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.withContext('internals.ariaLabel after connection')
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.toEqual('Second');
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element.remove();
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});
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it('should handle setting role after first connection while disconnected',
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async () => {
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const element = new TestElement();
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element.internals.role = 'button';
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document.body.appendChild(element);
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await element.updateComplete;
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element.remove();
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element.internals.role = 'checkbox';
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expect(element.internals.role)
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.withContext('internals.role after connected and disconnected')
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.toEqual('checkbox');
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document.body.appendChild(element);
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await element.updateComplete;
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expect(element.internals.role)
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.withContext('internals.role after reconnected')
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.toEqual('checkbox');
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element.remove();
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});
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}
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});
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});
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@ -11,6 +11,7 @@ import {html, isServer, LitElement} from 'lit';
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import {property} from 'lit/decorators.js';
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import {classMap} from 'lit/directives/class-map.js';
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import {polyfillElementInternalsAria, setupHostAria} from '../../internal/aria/aria.js';
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import {isActivationClick} from '../../internal/controller/events.js';
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import {SingleSelectionController} from './single-selection-controller.js';
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@ -22,6 +23,10 @@ let maskId = 0;
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* A radio component.
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*/
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export class Radio extends LitElement {
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static {
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setupHostAria(Radio);
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}
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/** @nocollapse */
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static readonly formAssociated = true;
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@ -86,30 +91,19 @@ export class Radio extends LitElement {
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}
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private readonly selectionController = new SingleSelectionController(this);
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private readonly internals =
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(this as HTMLElement /* needed for closure */).attachInternals();
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private readonly internals = polyfillElementInternalsAria(
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this, (this as HTMLElement /* needed for closure */).attachInternals());
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constructor() {
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super();
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this.addController(this.selectionController);
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if (!isServer) {
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this.internals.role = 'radio';
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this.addEventListener('click', this.handleClick.bind(this));
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this.addEventListener('keydown', this.handleKeydown.bind(this));
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}
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}
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override connectedCallback() {
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super.connectedCallback();
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// Firefox does not support ElementInternals aria yet, so we need to hydrate
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// an attribute.
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if (!('role' in this.internals)) {
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this.setAttribute('role', 'radio');
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return;
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}
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this.internals.role = 'radio';
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}
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protected override render() {
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const classes = {checked: this.checked};
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return html`
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@ -140,13 +134,6 @@ export class Radio extends LitElement {
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}
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protected override updated() {
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// Firefox does not support ElementInternals aria yet, so we need to hydrate
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// an attribute.
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if (!('ariaChecked' in this.internals)) {
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this.setAttribute('aria-checked', String(this.checked));
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return;
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}
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this.internals.ariaChecked = String(this.checked);
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}
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|
@ -9,6 +9,8 @@ import '../../divider/divider.js';
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import {html, isServer, LitElement, PropertyValues} from 'lit';
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import {property, queryAssignedElements, state} from 'lit/decorators.js';
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import {polyfillElementInternalsAria, setupHostAria} from '../../internal/aria/aria.js';
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import {Tab} from './tab.js';
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const NAVIGATION_KEYS = new Map([
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@ -41,6 +43,10 @@ const NAVIGATION_KEYS = new Map([
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*
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*/
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export class Tabs extends LitElement {
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static {
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setupHostAria(Tabs, {focusable: false});
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}
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/**
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* Index of the selected item.
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*/
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@ -86,30 +92,19 @@ export class Tabs extends LitElement {
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return this.items.find((el: HTMLElement) => el.matches(':focus-within'));
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}
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private readonly internals =
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(this as HTMLElement /* needed for closure */).attachInternals();
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private readonly internals = polyfillElementInternalsAria(
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this, (this as HTMLElement /* needed for closure */).attachInternals());
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constructor() {
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super();
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if (!isServer) {
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this.internals.role = 'tablist';
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this.addEventListener('keydown', this.handleKeydown);
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this.addEventListener('keyup', this.handleKeyup);
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this.addEventListener('focusout', this.handleFocusout);
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}
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||||
}
|
||||
|
||||
override connectedCallback() {
|
||||
super.connectedCallback();
|
||||
// Firefox does not support ElementInternals aria yet, so we need to hydrate
|
||||
// an attribute.
|
||||
if (!('role' in this.internals)) {
|
||||
this.setAttribute('role', 'tablist');
|
||||
return;
|
||||
}
|
||||
|
||||
this.internals.role = 'tablist';
|
||||
}
|
||||
|
||||
// focus item on keydown and optionally select it
|
||||
private readonly handleKeydown = async (event: KeyboardEvent) => {
|
||||
const {key} = event;
|
||||
|
Loading…
Reference in New Issue
Block a user