53 lines
1.9 KiB
JavaScript
53 lines
1.9 KiB
JavaScript
/* Business Trip Day Tracker — offline shell.
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Cache-first on purpose: this app is a static document whose whole point is
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working in airplane mode, so a stale-by-a-day shell beats a failed load.
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Bump CACHE when index.html changes; activate() drops every older cache. */
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var CACHE = "trip-tracker-v3";
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var ASSETS = ["./", "./index.html", "./manifest.webmanifest", "./icon-512.png"];
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self.addEventListener("install", function(e){
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e.waitUntil(
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caches.open(CACHE).then(function(c){
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/* addAll is all-or-nothing; one 404 would leave us with no offline copy
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at all, so fetch them individually and keep whatever succeeds. */
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return Promise.all(ASSETS.map(function(u){
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return fetch(u, {cache:"reload"})
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.then(function(r){ if(r && r.ok) return c.put(u, r); })
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.catch(function(){});
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}));
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}).then(function(){ return self.skipWaiting(); })
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);
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});
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self.addEventListener("activate", function(e){
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e.waitUntil(
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caches.keys().then(function(keys){
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return Promise.all(keys.map(function(k){
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return k === CACHE ? null : caches.delete(k);
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}));
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}).then(function(){ return self.clients.claim(); })
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);
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});
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self.addEventListener("fetch", function(e){
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var req = e.request;
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if(req.method !== "GET") return;
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if(new URL(req.url).origin !== self.location.origin) return;
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e.respondWith(
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caches.match(req, {ignoreSearch:true}).then(function(hit){
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if(hit) return hit;
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return fetch(req).then(function(res){
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if(res && res.ok){
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var copy = res.clone();
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caches.open(CACHE).then(function(c){ c.put(req, copy); });
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}
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return res;
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}).catch(function(){
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/* Offline and not cached — a navigation still gets the app shell. */
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if(req.mode === "navigate") return caches.match("./index.html");
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throw new Error("offline");
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});
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})
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);
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});
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