Background sync doesn't refresh page when back online - service-worker

Question

recently I started learning about service workers, background syncs... I implemented service worker and in install step I cached some files I want to show when offline.
self.addEventListener('install', (event) => {
event.waitUntil(
caches.open(CACHE)
.then((cache) => {
return cache.addAll([navigationIcon, offlineImage, offlineFallbackPage]);
})
);
});
I am listening to fetch event to catch when there is no internet connection so I can show offline page when then.
self.addEventListener('fetch', (event) => {
if (event.request.mode === 'navigate' || (event.request.method === 'GET'
&& event.request.headers.get('accept')
.includes('text/html'))) {
event.respondWith(
fetch(event.request.url)
.catch(() => {
// Return the offline page
return caches.match(offlineFallbackPage);
})
);
} else {
event.respondWith(caches.match(event.request)
.then((response) => {
return response || fetch(event.request);
}));
}
});
I also added background sync, so I can go back online when there is internet connection.
After registering service worker I added:
.then(swRegistration => swRegistration.sync.register('backOnline'))
And I listen to sync event in my service worker.
When I'm offline and go back online nothing happens. BUT when I delete my fetch event (don't show previously cached offline page) then page goes back online by itself (which I want to do when I have fetch event)
Does anyone know what should I add so my page can go back online by itself?

Answer 1

You can use navigator, Include it in your main js file that is cached or in your service-worker js file, just ensure it's cached
let onlineStatus = locate => {
if(navigator.onLine){
location.replace(locate)
}
}
let isOfflinePage = window.location.pathname == offlineFallbackPage ? true : false;
// kindly edit isOfflinePage to return true if it's offline page
if(isOfflinePage){
onlineStatus('index.html')
}
You can simply use location.reload() instead