56 lines
1.7 KiB
JavaScript
Executable File
56 lines
1.7 KiB
JavaScript
Executable File
//This is the service worker with the combined offline experience (Offline page + Offline copy of pages)
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//Install stage sets up the offline page in the cache and opens a new cache
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self.addEventListener('install', function(event) {
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event.waitUntil(preLoad());
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});
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var preLoad = function(){
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console.log('[PWA Builder] Install Event processing');
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return caches.open('pwabuilder-offline').then(function(cache) {
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console.log('[PWA Builder] Cached index and offline page during Install');
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return cache.addAll(['/offline.html', '/index.html']);
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});
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}
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self.addEventListener('fetch', function(event) {
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console.log('[PWA Builder] The service worker is serving the asset.');
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event.respondWith(checkResponse(event.request).catch(function() {
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return returnFromCache(event.request)}
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));
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event.waitUntil(addToCache(event.request));
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});
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var checkResponse = function(request){
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return new Promise(function(fulfill, reject) {
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fetch(request).then(function(response){
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if(response.status !== 404) {
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fulfill(response)
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} else {
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reject()
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}
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}, reject)
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});
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};
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var addToCache = function(request){
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return caches.open('pwabuilder-offline').then(function (cache) {
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return fetch(request).then(function (response) {
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console.log('[PWA Builder] add page to offline'+response.url)
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return cache.put(request, response);
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});
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});
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};
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var returnFromCache = function(request){
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return caches.open('pwabuilder-offline').then(function (cache) {
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return cache.match(request).then(function (matching) {
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if(!matching || matching.status == 404) {
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return cache.match('offline.html')
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} else {
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return matching
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}
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});
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});
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};
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