64 lines
2.7 KiB
JavaScript
64 lines
2.7 KiB
JavaScript
import { useEffect, useRef, useState } from 'react';
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import { createPortal } from 'react-dom';
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const ANNOUNCER_TYPE = 'next-route-announcer';
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const ANNOUNCER_ID = '__next-route-announcer__';
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function getAnnouncerNode() {
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var _existingAnnouncer_shadowRoot;
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const existingAnnouncer = document.getElementsByName(ANNOUNCER_TYPE)[0];
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if (existingAnnouncer == null ? void 0 : (_existingAnnouncer_shadowRoot = existingAnnouncer.shadowRoot) == null ? void 0 : _existingAnnouncer_shadowRoot.childNodes[0]) {
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return existingAnnouncer.shadowRoot.childNodes[0];
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} else {
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const container = document.createElement(ANNOUNCER_TYPE);
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container.style.cssText = 'position:absolute';
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const announcer = document.createElement('div');
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announcer.ariaLive = 'assertive';
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announcer.id = ANNOUNCER_ID;
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announcer.role = 'alert';
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announcer.style.cssText = 'position:absolute;border:0;height:1px;margin:-1px;padding:0;width:1px;clip:rect(0 0 0 0);overflow:hidden;white-space:nowrap;word-wrap:normal';
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// Use shadow DOM here to avoid any potential CSS bleed
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const shadow = container.attachShadow({
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mode: 'open'
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});
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shadow.appendChild(announcer);
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document.body.appendChild(container);
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return announcer;
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}
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}
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export function AppRouterAnnouncer(param) {
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let { tree } = param;
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const [portalNode, setPortalNode] = useState(null);
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useEffect(()=>{
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const announcer = getAnnouncerNode();
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setPortalNode(announcer);
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return ()=>{
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const container = document.getElementsByTagName(ANNOUNCER_TYPE)[0];
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if (container == null ? void 0 : container.isConnected) {
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document.body.removeChild(container);
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}
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};
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}, []);
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const [routeAnnouncement, setRouteAnnouncement] = useState('');
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const previousTitle = useRef(undefined);
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useEffect(()=>{
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let currentTitle = '';
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if (document.title) {
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currentTitle = document.title;
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} else {
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const pageHeader = document.querySelector('h1');
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if (pageHeader) {
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currentTitle = pageHeader.innerText || pageHeader.textContent || '';
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}
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}
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// Only announce the title change, but not for the first load because screen
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// readers do that automatically.
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if (previousTitle.current !== undefined && previousTitle.current !== currentTitle) {
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setRouteAnnouncement(currentTitle);
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}
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previousTitle.current = currentTitle;
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}, [
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tree
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]);
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return portalNode ? /*#__PURE__*/ createPortal(routeAnnouncement, portalNode) : null;
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}
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//# sourceMappingURL=app-router-announcer.js.map
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