next
Version:
The React Framework
80 lines (78 loc) • 3.35 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "AppRouterAnnouncer", {
enumerable: true,
get: function() {
return AppRouterAnnouncer;
}
});
const _react = require("react");
const _reactdom = require("react-dom");
const ANNOUNCER_TYPE = 'next-route-announcer';
const ANNOUNCER_ID = '__next-route-announcer__';
function getAnnouncerNode() {
var _existingAnnouncer_shadowRoot;
const existingAnnouncer = document.getElementsByName(ANNOUNCER_TYPE)[0];
if (existingAnnouncer == null ? void 0 : (_existingAnnouncer_shadowRoot = existingAnnouncer.shadowRoot) == null ? void 0 : _existingAnnouncer_shadowRoot.childNodes[0]) {
return existingAnnouncer.shadowRoot.childNodes[0];
} else {
const container = document.createElement(ANNOUNCER_TYPE);
container.style.cssText = 'position:absolute';
const announcer = document.createElement('div');
announcer.ariaLive = 'assertive';
announcer.id = ANNOUNCER_ID;
announcer.role = 'alert';
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';
// Use shadow DOM here to avoid any potential CSS bleed
const shadow = container.attachShadow({
mode: 'open'
});
shadow.appendChild(announcer);
document.body.appendChild(container);
return announcer;
}
}
function AppRouterAnnouncer(param) {
let { tree } = param;
const [portalNode, setPortalNode] = (0, _react.useState)(null);
(0, _react.useEffect)(()=>{
const announcer = getAnnouncerNode();
setPortalNode(announcer);
return ()=>{
const container = document.getElementsByTagName(ANNOUNCER_TYPE)[0];
if (container == null ? void 0 : container.isConnected) {
document.body.removeChild(container);
}
};
}, []);
const [routeAnnouncement, setRouteAnnouncement] = (0, _react.useState)('');
const previousTitle = (0, _react.useRef)(undefined);
(0, _react.useEffect)(()=>{
let currentTitle = '';
if (document.title) {
currentTitle = document.title;
} else {
const pageHeader = document.querySelector('h1');
if (pageHeader) {
currentTitle = pageHeader.innerText || pageHeader.textContent || '';
}
}
// Only announce the title change, but not for the first load because screen
// readers do that automatically.
if (previousTitle.current !== undefined && previousTitle.current !== currentTitle) {
setRouteAnnouncement(currentTitle);
}
previousTitle.current = currentTitle;
}, [
tree
]);
return portalNode ? /*#__PURE__*/ (0, _reactdom.createPortal)(routeAnnouncement, portalNode) : null;
}
if ((typeof exports.default === 'function' || (typeof exports.default === 'object' && exports.default !== null)) && typeof exports.default.__esModule === 'undefined') {
Object.defineProperty(exports.default, '__esModule', { value: true });
Object.assign(exports.default, exports);
module.exports = exports.default;
}
//# sourceMappingURL=app-router-announcer.js.map