51 lines
988 B
JavaScript
51 lines
988 B
JavaScript
// jshint asi:true
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var cacheName = "v2";
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var content = [
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"index.html",
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"app.js",
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"app.png",
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]
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self.addEventListener("install", preCache)
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self.addEventListener("fetch", cachingFetch)
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self.addEventListener("activate", handleActivate)
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function handleActivate(event){
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event.waitUntil(
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cleanup()
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)
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}
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async function cleanup(event) {
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let cacheNames = await caches.keys()
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for (let name of cacheNames) {
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if (name != cacheName) {
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console.log("Deleting old cache", name)
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caches.delete(name)
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}
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}
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}
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function preCache(event) {
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event.waitUntil(
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caches.open(cacheName)
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.then(cache => cache.addAll(content))
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)
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}
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// Go try to pull a newer version from the network,
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// but return what's in the cache for this request
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function cachingFetch(event) {
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fetch(event.request)
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.then(resp => {
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caches.open(cacheName)
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.then(cache => {
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cache.put(event.request, resp.clone())
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})
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})
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event.respondWith(caches.match(event.request))
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}
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