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app.mjs
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app.mjs
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/**
* Copyright 2018 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
import {unescape} from 'html-escaper';
import {API_CACHE_NAME} from './lib/constants.mjs';
import {syncContentIndex} from './lib/content-indexing.mjs';
window.addEventListener('load', async () => {
if (self._title) {
document.title = unescape(self._title);
}
if ('serviceWorker' in navigator) {
const registration = await navigator.serviceWorker.register(
'/service-worker.js');
syncContentIndex(registration);
}
const apiCache = await caches.open(API_CACHE_NAME);
const cachedRequests = await apiCache.keys();
const cachedUrls = cachedRequests.map((request) => request.url);
const offlineIndicator = document.querySelector('#offline');
const cards = document.querySelectorAll('.card');
const uncachedCards = [...cards].filter((card) => {
return !cachedUrls.includes(card.dataset.cacheUrl);
});
const onlineHandler = () => {
for (const uncachedCard of uncachedCards) {
uncachedCard.style.opacity = '1.0';
}
offlineIndicator.style.display = 'none';
};
const offlineHandler = () => {
for (const uncachedCard of uncachedCards) {
uncachedCard.style.opacity = '0.3';
}
offlineIndicator.style.display = 'block';
};
if (navigator.onLine) {
onlineHandler();
} else {
offlineHandler();
}
window.addEventListener('online', onlineHandler);
window.addEventListener('offline', offlineHandler);
});