Created
April 8, 2018 10:03
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serviceWorker update
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/** | |
* Copyright 2015 Google Inc. All rights reserved. | |
* | |
* 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. | |
*/ | |
/* eslint-env browser */ | |
'use strict'; | |
if ('serviceWorker' in navigator) { | |
// Delay registration until after the page has loaded, to ensure that our | |
// precaching requests don't degrade the first visit experience. | |
// See https://developers.google.com/web/fundamentals/instant-and-offline/service-worker/registration | |
window.addEventListener('load', function() { | |
// Your service-worker.js *must* be located at the top-level directory relative to your site. | |
// It won't be able to control pages unless it's located at the same level or higher than them. | |
// *Don't* register service worker file in, e.g., a scripts/ sub-directory! | |
// See https://github.com/slightlyoff/ServiceWorker/issues/468 | |
navigator.serviceWorker.register('service-worker.js').then(function(reg) { | |
// updatefound is fired if service-worker.js changes. | |
reg.onupdatefound = function() { | |
// The updatefound event implies that reg.installing is set; see | |
// https://w3c.github.io/ServiceWorker/#service-worker-registration-updatefound-event | |
var installingWorker = reg.installing; | |
installingWorker.onstatechange = function() { | |
switch (installingWorker.state) { | |
case 'installed': | |
if (navigator.serviceWorker.controller) { | |
// At this point, the old content will have been purged and the fresh content will | |
// have been added to the cache. | |
// It's the perfect time to display a "New content is available; please refresh." | |
// message in the page's interface. | |
console.log('New or updated content is available.'); | |
} else { | |
// At this point, everything has been precached. | |
// It's the perfect time to display a "Content is cached for offline use." message. | |
console.log('Content is now available offline!'); | |
} | |
break; | |
case 'redundant': | |
console.error('The installing service worker became redundant.'); | |
break; | |
} | |
}; | |
}; | |
}).catch(function(e) { | |
console.error('Error during service worker registration:', e); | |
}); | |
}); | |
} |
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