I have a question about caching in PWA.
I would like to let user choose a list to cache. For example:
User creating few lists, and then he choose one, to save for offline.
When he is offline he can only open 2 views:
- smth like "u are offline, do you want to open saved list?" (if it exist)
- View with saved list.
At this moment, I am caching all views that user visited, but can't cache views with dynamic data.
I'm using PWA.essentials to do PWA.
services.AddProgressiveWebApp(new PwaOptions
{
RegisterServiceWorker = true,
RegisterWebmanifest = false,
Strategy = ServiceWorkerStrategy.NetworkFirst,
RoutesToPreCache = "/, /Home/Offline, /Home/Saved_list",
OfflineRoute="Offline.html"
});
I have created manifest.json. When im using dev mode in chrome, I can see that at this moment, I'm caching all views execpt views with more complicated path (like /Controller/View/something).
I'm saving list, that user choose in a "Offline.json" file, that is cached too,but when user changes list to save, file "offline.json" is still no updated. I mean my PWA doesn't replace it with new one.
So I have a question about how can I save dynamic list to browser cache, and then set offline route to it.
Service Worker Created by pwa.essentials:
(function () {
'use strict';
// Update 'version' if you need to refresh the cache
var version = 'v1.0::NetworkFirst';
var offlineUrl = "Offline.html";
// Store core files in a cache (including a page to display when offline)
function updateStaticCache() {
return caches.open(version)
.then(function (cache) {
return cache.addAll([
offlineUrl,
'/','/Home','/Generate/Select_mode'
]);
});
}
function addToCache(request, response) {
if (!response.ok)
return;
var copy = response.clone();
caches.open(version)
.then(function (cache) {
cache.put(request, copy);
});
}
self.addEventListener('install', function (event) {
event.waitUntil(updateStaticCache());
});
self.addEventListener('activate', function (event) {
event.waitUntil(
caches.keys()
.then(function (keys) {
// Remove caches whose name is no longer valid
return Promise.all(keys
.filter(function (key) {
return key.indexOf(version) !== 0;
})
.map(function (key) {
return caches.delete(key);
})
);
})
);
});
self.addEventListener('fetch', function (event) {
var request = event.request;
// Always fetch non-GET requests from the network
if (request.method !== 'GET') {
event.respondWith(
fetch(request)
.catch(function () {
return caches.match(offlineUrl);
})
);
return;
}
event.respondWith(
fetch(request)
.then(function (response) {
// Stash a copy of this page in the cache
addToCache(request, response);
return response;
})
.catch(function () {
return caches.match(request)
.then(function (response) {
return response || caches.match(offlineUrl);
})
.catch(function () {
if (request.headers.get('Accept').indexOf('image') !== -1) {
return new Response('<svg role="img" aria-labelledby="offline-title" viewBox="0 0 400 300" xmlns="http://www.w3.org/2000/svg"><title id="offline-title">Offline</title><g fill="none" fill-rule="evenodd"><path fill="#D8D8D8" d="M0 0h400v300H0z"/><text fill="#9B9B9B" font-family="Helvetica Neue,Arial,Helvetica,sans-serif" font-size="72" font-weight="bold"><tspan x="93" y="172">offline</tspan></text></g></svg>', { headers: { 'Content-Type': 'image/svg+xml' } });
}
});
})
);
});
})();
