I'm trying to implement a basic service worker to assure that users of my simple web app have the latest code. So when I update html, js, or css files I can increment the cachename in the service worker file and prompt users to refresh, clear their cache, and get the latest code.
Until now I've relied on hacky ways to update javascript files (including a parameter in the referring URL: /javascript-file.js?v=1).
The with the service worker code below seem unpredictable: sometimes small changes to JS or CSS are reflected after I increment the cachename (code below). Sometimes the changes are reflected without incrementing the cachename, which suggests the code is ALWAYS pulling from the network (wasting resources).
How can you troubleshoot which version of files the code is using and whether the service worker is using cached or network versions? Am I not understanding the basic model for using service workers to achieve this goal?
Any help appreciated.
serv-worker.js (in root):
console.log('Start serv-worker.js');
const cacheName = '3.2121';
var urlsToCache = [
'home.html',
'home-js.js',
'web-bg.js',
'css/main.css',
'css/edit-menus.css'
];
self.addEventListener('install', event => {
console.log('Install event...', urlsToCache);
event.waitUntil(
caches.open(cacheName)
.then(function(cache) {
console.log('Opened cache', cacheName);
return cache.addAll(urlsToCache);
})
);
});
// Network first.
self.addEventListener('fetch', (event) => {
// Check the cache first
// If it's not found, send the request to the network
// event.respondWith(
// caches.match(event.request).then(function (response) {
// return response || fetch(event.request).then(function (response) {
// return response;
// });
// })
// );
event.respondWith(async function() {
try {
console.log('aPull from network...', event.request);
return await fetch(event.request);
} catch (err) {
console.log('aPull from cache...', event.request);
return caches.match(event.request);
}
}());
});
self.addEventListener('message', function (event) {
console.log('ServiceWorker cache version: ', cacheName, event);
console.log('Received msg1: ', event.data);
if (event.data.action === 'skipWaiting') {
console.log('ccClearing cache: ', cacheName);
// caches.delete('1.9rt1'); // hardcode old one
// caches.delete(cacheName); // actually removes cached versions
caches.keys().then(function(names) {
for (let name of names)
caches.delete(name);
});
self.skipWaiting();
}
});
Code in web-bg.js, which home.html references:
function servWorker(){
let newWorker;
function showUpdateBar() {
console.log('Show the update mssgg...ddddd');
$('#flexModalHeader').html('AP just got better!');
$('#flexModalMsg').html("<p>AP just got better. Learn about <a href='https://11trees.com/support/release-notes-annotate-pro-web-editor/'>what changed</a>.<br><br>Hit Continue to refresh.</p>");
$('#flexModalBtn').html("<span id='updateAPbtn'>Continue</span>");
$('#flexModal').modal('show');
}
// The click event on the pop up notification
$(document).on('click', '#updateAPbtn', function (e) {
console.log('Clicked btn to refresh...');
newWorker.postMessage({ action: 'skipWaiting' });
});
if ('serviceWorker' in navigator) {
console.log('ServiceWORKER 1234');
navigator.serviceWorker.register(baseDomain + 'serv-worker.js').then(reg => {
console.log('In serviceWorker check...', reg);
reg.addEventListener('updatefound', () => {
console.log('A wild service worker has appeared in reg.installing!');
newWorker = reg.installing;
newWorker.addEventListener('statechange', () => {
// Has network.state changed?
console.log('SSState is now: ', newWorker.state);
switch (newWorker.state) {
case 'installed':
if (navigator.serviceWorker.controller) {
// new update available
console.log('Detected service worker update...show update...');
showUpdateBar();
}
// No update available
break;
}
});
});
});
let refreshing;
navigator.serviceWorker.addEventListener('controllerchange', function (e) {
console.log('a1111xxxListen for controllerchange...', e);''
if (refreshing) return;
console.log('Refresh the page...');
window.location.reload();
refreshing = true;
});
} // End serviceworker registration logic
return;
} // END serv-worker
You've commented out the section for /// Check the cache first and then below that the try/catch statement again pulls from the network and falls back to the cache.
Uncomment this section of code and see if you're loading from the cache first.
// event.respondWith(
// caches.match(event.request).then(function (response) {
// return response || fetch(event.request).then(function (response) {
// return response;
// });
// })
// );
Don't forget that even if you request from the network from the service worker the browser will still use it's own internal cache to serve data. How long the data stays in the browser's cache depends on the expiration headers being sent by the server.
When using expires, it's still a fairly common solution to do something like:
index.html - expires after an hour. Has script/css tags that call out file names with ?v=x.y.z
/resources - folder that holds js and css. This folder has a very long expiration time. But that long expiration is short circuited by changing the ?v=x.y.z in index.html
I've used the above successfully in Progressive Web Apps (PWAs). But it is a little painful when debugging. The best option here is to manually clear out the cache and service worker from Dev Tools \ Application, if you're in Chrome.
Related
I'm writing my first react app with create-react-app but encountered a problem when setting up pwa.
I was trying to show a snackbar on new service-worker registration, but i won't get it working even with the template code.
Below is my service-worker.js under ./src/ (the same as the one in cra template)
/* eslint-disable no-restricted-globals */
// This service worker can be customized!
// See https://developers.google.com/web/tools/workbox/modules
// for the list of available Workbox modules, or add any other
// code you'd like.
// You can also remove this file if you'd prefer not to use a
// service worker, and the Workbox build step will be skipped.
import { clientsClaim } from 'workbox-core';
import { ExpirationPlugin } from 'workbox-expiration';
import { precacheAndRoute, createHandlerBoundToURL } from 'workbox-precaching';
import { registerRoute } from 'workbox-routing';
import { StaleWhileRevalidate } from 'workbox-strategies';
clientsClaim();
// Precache all of the assets generated by your build process.
// Their URLs are injected into the manifest variable below.
// This variable must be present somewhere in your service worker file,
// even if you decide not to use precaching. See https://cra.link/PWA
precacheAndRoute(self.__WB_MANIFEST);
// Set up App Shell-style routing, so that all navigation requests
// are fulfilled with your index.html shell. Learn more at
// https://developers.google.com/web/fundamentals/architecture/app-shell
const fileExtensionRegexp = new RegExp('/[^/?]+\\.[^/]+$');
registerRoute(
// Return false to exempt requests from being fulfilled by index.html.
({ request, url }) => {
// If this isn't a navigation, skip.
if (request.mode !== 'navigate') {
return false;
} // If this is a URL that starts with /_, skip.
if (url.pathname.startsWith('/_')) {
return false;
} // If this looks like a URL for a resource, because it contains // a file extension, skip.
if (url.pathname.match(fileExtensionRegexp)) {
return false;
} // Return true to signal that we want to use the handler.
return true;
},
createHandlerBoundToURL(process.env.PUBLIC_URL + '/index.html')
);
// An example runtime caching route for requests that aren't handled by the
// precache, in this case same-origin .png requests like those from in public/
registerRoute(
// Add in any other file extensions or routing criteria as needed.
({ url }) => url.origin === self.location.origin && url.pathname.endsWith('.png'), // Customize this strategy as needed, e.g., by changing to CacheFirst.
new StaleWhileRevalidate({
cacheName: 'images',
plugins: [
// Ensure that once this runtime cache reaches a maximum size the
// least-recently used images are removed.
new ExpirationPlugin({ maxEntries: 50 }),
],
})
);
// This allows the web app to trigger skipWaiting via
// registration.waiting.postMessage({type: 'SKIP_WAITING'})
self.addEventListener('message', (event) => {
if (event.data && event.data.type === 'SKIP_WAITING') {
self.skipWaiting();
}
});
// Any other custom service worker logic can go here.
And here is my serviceWorkerRegistration.js under ./src/utils. Also nearly the same as the originally shipped one w/ location change and one console.log msg modification (I'm sure ive correctly imported it as the onSuccess callback was functional)
// This optional code is used to register a service worker.
// register() is not called by default.
// This lets the app load faster on subsequent visits in production, and gives
// it offline capabilities. However, it also means that developers (and users)
// will only see deployed updates on subsequent visits to a page, after all the
// existing tabs open on the page have been closed, since previously cached
// resources are updated in the background.
// To learn more about the benefits of this model and instructions on how to
// opt-in, read https://cra.link/PWA
const isLocalhost = Boolean(
window.location.hostname === 'localhost' ||
// [::1] is the IPv6 localhost address.
window.location.hostname === '[::1]' ||
// 127.0.0.0/8 are considered localhost for IPv4.
window.location.hostname.match(/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/)
);
export function register(config) {
if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
// The URL constructor is available in all browsers that support SW.
const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
if (publicUrl.origin !== window.location.origin) {
// Our service worker won't work if PUBLIC_URL is on a different origin
// from what our page is served on. This might happen if a CDN is used to
// serve assets; see https://github.com/facebook/create-react-app/issues/2374
return;
}
window.addEventListener('load', () => {
const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
if (isLocalhost) {
// This is running on localhost. Let's check if a service worker still exists or not.
checkValidServiceWorker(swUrl, config);
// Add some additional logging to localhost, pointing developers to the
// service worker/PWA documentation.
navigator.serviceWorker.ready.then(() => {
console.log(
'This web app is being served cache-first by a service ' +
'worker. To learn more, visit https://cra.link/PWA'
);
});
} else {
// Is not localhost. Just register service worker
registerValidSW(swUrl, config);
}
});
}
}
function registerValidSW(swUrl, config) {
navigator.serviceWorker
.register(swUrl)
.then((registration) => {
registration.onupdatefound = () => {
const installingWorker = registration.installing;
if (installingWorker == null) {
return;
}
installingWorker.onstatechange = () => {
if (installingWorker.state === 'installed') {
if (navigator.serviceWorker.controller) {
// At this point, the updated precached content has been fetched,
// but the previous service worker will still serve the older
// content until all client tabs are closed.
console.log(
'New content is available! Click the pop-up notification to update it!'
);
// Execute callback
if (config && config.onUpdate) {
config.onUpdate(registration);
}
} else {
// At this point, everything has been precached.
// It's the perfect time to display a
// "Content is cached for offline use." message.
console.log('Content is cached for offline use.');
// Execute callback
if (config && config.onSuccess) {
config.onSuccess(registration);
}
}
}
};
};
})
.catch((error) => {
console.error('Error during service worker registration:', error);
});
}
function checkValidServiceWorker(swUrl, config) {
// Check if the service worker can be found. If it can't reload the page.
fetch(swUrl, {
headers: { 'Service-Worker': 'script' },
})
.then((response) => {
// Ensure service worker exists, and that we really are getting a JS file.
const contentType = response.headers.get('content-type');
if (
response.status === 404 ||
(contentType != null && contentType.indexOf('javascript') === -1)
) {
// No service worker found. Probably a different app. Reload the page.
navigator.serviceWorker.ready.then((registration) => {
registration.unregister().then(() => {
window.location.reload();
});
});
} else {
// Service worker found. Proceed as normal.
registerValidSW(swUrl, config);
}
})
.catch(() => {
console.log('No internet connection found. App is running in offline mode.');
});
}
export function unregister() {
if ('serviceWorker' in navigator) {
navigator.serviceWorker.ready
.then((registration) => {
registration.unregister();
})
.catch((error) => {
console.error(error.message);
});
}
}
I'm registering sw with a useEffect hook:
useEffect(() => {
registerSW({
onSuccess: () => setShowSuccess(true),
onUpdate: sw => {
console.log('onUpdate triggered')
setShowReload(true)
setSW(sw)
},
});
}, []);
The onSuccess callback was working perfectly but the problem was, the onUpdate callback simply wont be triggered. Also the console.log msg in serviceWorkerRegistration itself('New content is available! Click the pop-up notification to update it!') won't appear.
My guess was that some browser apis have changed and the onupdatefound api will no longer work. But I'm not sure if it was because my app call sw to register on every page load, and at that time, the service worker registered is already the new sw.js so that there will not be an update.
I've checked my previous project and found that i was listening on navigator.serviceWorker's controllerchange. I'm not sure which method is correct and how can i implement this feature in react. And im curious about when the onUpdate callback is called and if i was using it correctly.
Thanks in advance!
After some console.log based debugging, i found that this bug was caused by sw registration module loaded after window.onload, causing the template code no longer useful as the registerValidSW function will only be triggered when window.onload target is reached.
I've modified the window.onload part to this to resolve this issue:
const callRegisterValidSW = () => {
const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
if (isLocalhost) {
// This is running on localhost. Let's check if a service worker still exists or not.
checkValidServiceWorker(swUrl, config);
// Add some additional logging to localhost, pointing developers to the
// service worker/PWA documentation.
navigator.serviceWorker.ready.then(() => {
console.log(
'This web app is being served cache-first by a service worker.'
);
});
} else {
// Is not localhost. Just register service worker
registerValidSW(swUrl, config);
}
};
if (document.readyState === "complete") {
callRegisterValidSW();
} else {
window.addEventListener('load', callRegisterValidSW);
}
If someone here sees the maintainer of https://github.com/cra-template/pwa/, we may add some comment around this part in the shipped swRegistration function.
I have implemented Workbox to generate my service worker using webpack.
This works pretty well - I can confirm that revision is updated in the generated service worker when running yarn run generate-sw (package.json: "generate-sw": "workbox inject:manifest").
The problem is - I have noticed my clients are not updating the cache after a new release.
Even days after updating the service worker my clients are still caching the old code and new code will only cache after several refreshes and/or unregister the service worker.
For each release the const CACHE_DYNAMIC_NAME = 'dynamic-v1.1.0' is updated.
How can I ensure that clients updates the cache immediately after a new release?
serviceWorker-base.js
importScripts('workbox-sw.prod.v2.1.3.js')
const CACHE_DYNAMIC_NAME = 'dynamic-v1.1.0'
const workboxSW = new self.WorkboxSW()
// Cache then network for fonts
workboxSW.router.registerRoute(
/.*(?:googleapis)\.com.*$/,
workboxSW.strategies.staleWhileRevalidate({
cacheName: 'google-font',
cacheExpiration: {
maxEntries: 1,
maxAgeSeconds: 60 * 60 * 24 * 28
}
})
)
// Cache then network for css
workboxSW.router.registerRoute(
'/dist/main.css',
workboxSW.strategies.staleWhileRevalidate({
cacheName: 'css'
})
)
// Cache then network for avatars
workboxSW.router.registerRoute(
'/img/avatars/:avatar-image',
workboxSW.strategies.staleWhileRevalidate({
cacheName: 'images-avatars'
})
)
// Cache then network for images
workboxSW.router.registerRoute(
'/img/:image',
workboxSW.strategies.staleWhileRevalidate({
cacheName: 'images'
})
)
// Cache then network for icons
workboxSW.router.registerRoute(
'/img/icons/:image',
workboxSW.strategies.staleWhileRevalidate({
cacheName: 'images-icons'
})
)
// Fallback page for html files
workboxSW.router.registerRoute(
(routeData)=>{
// routeData.url
return (routeData.event.request.headers.get('accept').includes('text/html'))
},
(args) => {
return caches.match(args.event.request)
.then((response) => {
if (response) {
return response
}else{
return fetch(args.event.request)
.then((res) => {
return caches.open(CACHE_DYNAMIC_NAME)
.then((cache) => {
cache.put(args.event.request.url, res.clone())
return res
})
})
.catch((err) => {
return caches.match('/offline.html')
.then((res) => { return res })
})
}
})
}
)
workboxSW.precache([])
// Own vanilla service worker code
self.addEventListener('notificationclick', function (event){
let notification = event.notification
let action = event.action
console.log(notification)
if (action === 'confirm') {
console.log('Confirm was chosen')
notification.close()
} else {
const urlToOpen = new URL(notification.data.url, self.location.origin).href;
const promiseChain = clients.matchAll({ type: 'window', includeUncontrolled: true })
.then((windowClients) => {
let matchingClient = null;
let matchingUrl = false;
for (let i=0; i < windowClients.length; i++){
const windowClient = windowClients[i];
if (windowClient.visibilityState === 'visible'){
matchingClient = windowClient;
matchingUrl = (windowClient.url === urlToOpen);
break;
}
}
if (matchingClient){
if(!matchingUrl){ matchingClient.navigate(urlToOpen); }
matchingClient.focus();
} else {
clients.openWindow(urlToOpen);
}
notification.close();
});
event.waitUntil(promiseChain);
}
})
self.addEventListener('notificationclose', (event) => {
// Great place to send back statistical data to figure out why user did not interact
console.log('Notification was closed', event)
})
self.addEventListener('push', function (event){
console.log('Push Notification received', event)
// Default values
const defaultData = {title: 'New!', content: 'Something new happened!', openUrl: '/'}
const data = (event.data) ? JSON.parse(event.data.text()) : defaultData
var options = {
body: data.content,
icon: '/images/icons/manifest-icon-512.png',
badge: '/images/icons/badge128.png',
data: {
url: data.openUrl
}
}
console.log('options', options)
event.waitUntil(
self.registration.showNotification(data.title, options)
)
})
Should I delete the cache manually or should Workbox do that for me?
caches.keys().then(cacheNames => {
cacheNames.forEach(cacheName => {
caches.delete(cacheName);
});
});
Kind regards /K
I think your problem is related to the fact that when you make an update to the app and deploy, new service worker gets installed, but not activated. Which explains the behaviour why this is happening.
The reason for this is registerRoute function also registers fetch listeners , but those fetch listeners won't be called until new service worker kicks in as activated. Also, the answer to your question: No, you don't need to remove the cache by yourself. Workbox takes care of those.
Let me know more details. When you deploy new code, and if users close all the tabs of your website and open a new one after that, does it start working after 2 refreshes? If so , that's how it should be working. I will update my answer after you provide more details.
I'd suggest you read the following: https://redfin.engineering/how-to-fix-the-refresh-button-when-using-service-workers-a8e27af6df68 and follow the 3rd approach.
One way to get WorkBox to update when you have the files locally, not on a CDN, is the following way:
In your serviceworker.js file add an event listener so that WorkBox skips waiting when there is an update, my code looks like this:
importScripts('Scripts/workbox/workbox-sw.js');
if (workbox) {
console.log('Workbox is loaded :)');
// Add a message listener to the waiting service worker
// instructing it to skip waiting on when updates are done.
addEventListener('message', (event) => {
if (event.data && event.data.type === 'SKIP_WAITING') {
skipWaiting();
}
});
// Since I am using Local Workbox Files Instead of CDN I need to set the modulePathPrefix as follows
workbox.setConfig({ modulePathPrefix: 'Scripts/workbox/' });
// other workbox settings ...
}
In your client side page add an event listener for loads if service worker is in the navigator. As a note I am doing this in MVC so I put my code in the _Layout.cshtml so that it can update from any page on my website.
<script type="text/javascript">
if ('serviceWorker' in navigator) {
// Use the window load event to keep the page load performant
window.addEventListener('load', () => {
navigator.serviceWorker
// register WorkBox, our ServiceWorker.
.register("<PATH_TO_YOUR_SERVICE_WORKER/serviceworker.js"), { scope: '/<SOME_SCOPE>/' })
.then(function (registration) {
/**
* Whether WorkBox cached files are being updated.
* #type {boolean}
* */
let updating;
// Function handler for the ServiceWorker updates.
registration.onupdatefound = () => {
const serviceWorker = registration.installing;
if (serviceWorker == null) { // service worker is not available return.
return;
}
// Listen to the browser's service worker state changes
serviceWorker.onstatechange = () => {
// IF ServiceWorker has been installed
// AND we have a controller, meaning that the old chached files got deleted and new files cached
// AND ServiceWorkerRegistration is waiting
// THEN let ServieWorker know that it can skip waiting.
if (serviceWorker.state === 'installed' && navigator.serviceWorker.controller && registration && registration.waiting) {
updating = true;
// In my "~/serviceworker.js" file there is an event listener that got added to listen to the post message.
registration.waiting.postMessage({ type: 'SKIP_WAITING' });
}
// IF we had an update of the cache files and we are done activating the ServiceWorker service
// THEN let the user know that we updated the files and we are reloading the website.
if (updating && serviceWorker.state === 'activated') {
// I am using an alert as an example, in my code I use a custom dialog that has an overlay so that the user can't do anything besides clicking okay.
alert('The cached files have been updated, the browser will re-load.');
window.location.reload();
}
};
};
console.log('ServiceWorker registration successful with scope: ', registration.scope);
}).catch(function (err) {
//registration failed :(
console.log('ServiceWorker registration failed: ', err);
});
});
} else {
console.log('No service-worker on this browser');
}
</script>
Note: I used the browser's service worker to update my WorkBox cached files, also, I've only tested this in Chrome, I have not tried it in other browsers.
I implemented the service worker from pwabuilder.com and it works just fine
The problem is that the service worker runs even if the browser is online, so every js functions runs twice, one from the service worker and one from my other js files
Should I look if it's an active service worker before I run my js functions or should I somehow make sure that the service worker is not running when the browser is online?
This is the code I run in my main index file
if (navigator.serviceWorker.controller) {
//console.log('[PWA Builder] active service worker found, no need to register')
} else {
//Register the ServiceWorker
navigator.serviceWorker.register('pwabuilder-sw.js', {
scope: './'
}).then(function (reg) {
//console.log('Service worker has been registered for scope:' + reg.scope);
});
}
The pwabuilder-sw.js looks like this:
self.addEventListener('install', function (event) {
var indexPage = new Request('');
event.waitUntil(
fetch(indexPage).then(function (response) {
return caches.open('pwabuilder-offline').then(function (cache) {
//console.log('[PWA Builder] Cached index page during Install' + response.url);
return cache.put(indexPage, response);
});
}));
});
//If any fetch fails, it will look for the request in the cache and serve it from there first
self.addEventListener('fetch', function (event) {
var updateCache = function (request) {
return caches.open('pwabuilder-offline').then(function (cache) {
return fetch(request).then(function (response) {
//console.log('[PWA Builder] add page to offline' + response.url);
return cache.put(request, response);
});
});
};
event.waitUntil(updateCache(event.request));
event.respondWith(
fetch(event.request).catch(function (error) {
//Check to see if you have it in the cache
//Return response
//If not in the cache, then return error page
return caches.open('pwabuilder-offline').then(function (cache) {
return cache.match(event.request).then(function (matching) {
var report = !matching || matching.status === 404 ? Promise.reject('no-match') : matching;
return report;
});
});
})
);
});
Service Workers are meant to work all the time once registered, installed and activated
Service workers are event driven and their primary use is to act as a caching agent, to handle network requests and to store content for offline use. Secondly to handle push messaging.
I trust you understand that in order to act as a caching agent the service worker will run regardless if the application is online or offline. You have various caching scenarios to consider.
It is hard to provide exact solution for the mentioned: 'every js functions runs twice'.I doubt that all JS functions would always run twice. It seems this is implementation dependant.
Service workers cannot have a scope above their own path, by default it will control all resources below the scope of the service worker, this scope can also be restricted.
navigation.serviceWorker.register(
'/pwabuilder-sw.js', { //SW located at the root level here
scope: '/app/' //to control all resource accessed form within path /app/
}
);
I believe that the script from pwabuilder.com does attempt to cache all resources even resources that should not be cached such as POST requests. You may need to modify the caching policy depending on what type of resources your are using.
There is no simple solution here and no easy answer can be provided.
In general you can use the service worker to cache resources in one of the following ways:
Cache falling back to network
self.addEventListener('fetch', (event) => {
event.responseWith(
caches.match(event.request)
.then((response) => {
return response || fetch(event.request);
})
);
});
Network falling back to cache
//Good for resources that update frequently
//Bad for Intermittend and slow connections
self.addEventListener('fetch', (event) => {
event.responseWith(
fetch(event.request).catch(() => {
return caches.match(event.request);
})
);
});
Cache then network
//Cache then network(1) (send request to cache and network simultaneousely)
//show cached version first, then update the page when the network data arrives
var networkDataReceived = false;
var networkUpdate = fetch('/data.json')
.then((response) => {
return response.json();
}).then((data) => {
networkDataReceived = true;
updatePage(data);
});
//Cache then network(2)
caches.match('/data.json')
.then ((response) => {
return response.json();
}).then((data) => {
if (!networkDataReceived) {
updatePage(data);
}
}).catch(() => {
return networkUpdate;
});
Generic fallback
self.addEventListener('fetch', (event) => {
event.responseWith(
caches.match(event.request)
.then((response) => {
return response || fetch(event.request);
}).catch(() => {
return caches.match('offline.html');
})
)
});
I hope the above helps at least a little find the exact issue you are facing. Cheers and happy codding!
React added this React.strictMode HOC that runs twice certain parts of the application, like class component constructor, render, and shouldComponentUpdate methods.
Check the docs:
https://reactjs.org/docs/strict-mode.html#detecting-unexpected-side-effects.
See if you have <React.StrictMode> at the top of your index.js file and if so, you might want to run a test without it.
This is my first PWA app with laravel. This code is working,it gets registered well, but if I do a change in the code, for example in the HTML, it is not getting update, and the console is not throwing errors, and I dont know why.
I'm using this code to call the service-worker.js
if ('serviceWorker' in navigator ) {
window.addEventListener('load', function() {
navigator.serviceWorker.register('/service-worker.js').then(function(registration) {
// Registration was successful
console.log('ServiceWorker registration successful with scope: ', registration.scope);
}, function(err) {
// registration failed :(
console.log('ServiceWorker registration failed: ', err);
});
});
}
And this is the code of the sw.js
var cache_name = 'SW_CACHE';
var urlsToCache = [
'/',
'/register'
];
self.addEventListener('install', function(event) {
event.waitUntil(precache());
});
addEventListener('fetch', function(event) {
event.respondWith(
caches.match(event.request)
.then(function(response) {
// Cache hit - return response
if (response) {
return response;
}
var fetchRequest = event.request.clone();
return fetch(fetchRequest).then(
function(response) {
// Check if we received a valid response
if(!response || response.status !== 200 || response.type !== 'basic') {
return response;
}
var responseToCache = response.clone();
caches.open(cache_name)
.then(function(cache) {
cache.put(event.request, responseToCache);
});
return response;
}
);
})
);
});
var fromCache = function (request) {
return caches.open(cache_name).then(function (cache) {
cache.match(request).then(function (matching) {
return matching || Promise.resolve('no-match');
});
});
}
var update = function (request) {
return caches.open(cache_name).then(function (cache) {
return fetch(request).then(function (response) {
return cache.put(request, response);
});
});
}
var precache = function() {
return caches.open(cache_name).then(function (cache) {
return cache.addAll(urlsToCache);
});
}
Y also used skipWaiting(); method inner Install method, but it crash my app and have to unload the sw from chrome://serviceworker-internals/
This is what service worker lifecycle suppose to work: a new service worker won't take place, unless:
The window or tabs controlled by the older service worker are closed and reopened
'Update on reload' option is checked in Chrome devtools
Here is an official tutorial explained it well: The Service Worker Lifecycle
Service worker will always use the existing worker. Two thinks you can do is in chrome there is an option to set update on load
Goto InspectorWindow (f12) -> application -> and check update on reload.
if you want immediate update you can choose the network first cache approach. which will take the latest from server always and use the cache only in offline mode. see the link for more information
How API is getting cached effectively, Using Service worker in Angular 5 using Angular CLI
I have integrated service worker in my website. Everything used to works perfectly, but now, I have an error when my service worker try to install :
Uncaught (in promise) TypeError: Request failed at anonymous service-worker.js:1
And my service worker is in the 'redundant' state.
I don't know why... I did not change my code, this is my index.html :
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('/service-worker.js').then(function(reg) {
if(reg.installing) {
console.log('Service worker installing');
} else if(reg.waiting) {
console.log('Service worker installed');
} else if(reg.active) {
console.log('Service worker active');
}
}).catch(function(error) {
// registration failed
console.log('Registration failed with ' + error);
});
}
And here is my service-worker.js :
self.addEventListener('install', function(event) {
event.waitUntil(
caches.open('v1').then(function(cache) {
return cache.addAll([
'/',
'/theme/website_mobile/js',
'/theme/website_mobile/css',
'/theme/website_mobile/js.js',
'/theme/website_mobile/css.css',
'/js/614cd8e.js',
'/css/f1407bb.css',
'/js/93779bc.js',
'/js/d228ec7.js',
'/theme/website_mobile/img/slider-home/slider1.jpg',
'/theme/website_mobile/img/slider-home/slider2.jpg',
'/theme/website_mobile/img/slider-home/slider3.jpg',
'/theme/website_mobile/img/slider-home/slider4.jpg',
'/theme/website_mobile/img/logo-website.png',
'/theme/website_mobile/img/picto-menu-close.png',
'/theme/website_mobile/img/picto-close.png',
'/var/website/storage/images/media/website-medias/website-materials/5163440-1-eng-GB/website-materials_article_list_main_website_enm.jpg',
'/theme/website_mobile/fonts/website-montserrat/Montserrat-Light.woff2',
'/theme/website_mobile/fonts/website-montserrat/Montserrat-Regular.woff2',
'/theme/website_mobile/fonts/website-montserrat/Montserrat-ExtraBold.woff2',
'/theme/website_mobile/fonts/website-avenir/Fonts/065a6b14-b2cc-446e-9428-271c570df0d9.woff2',
]);
})
);
});
self.addEventListener('fetch', function(event) {
event.respondWith(caches.match(event.request).then(function(response) {
// caches.match() always resolves
// but in case of success response will have value
if (response !== undefined) {
return response;
} else {
return fetch(event.request).then(function (response) {
// response may be used only once
// we need to save clone to put one copy in cache
// and serve second one
let responseClone = response.clone();
caches.open('v1').then(function (cache) {
cache.put(event.request, responseClone);
});
return response;
}).catch(function (e) {
return caches.match('/');
});
}
}));
});
A more stranger thing is when I tried to edit my service-worker.js, I added this :
self.addEventListener('install', function(event) {
**reg.update();**
which is a mistake, but I figured out that this works good ! I have an reg is undefined error in the console, but my service worker works good.
I tried to change the reg.update() part and put a simple console.log but, when I did that, the service-worker return in the redundant state and don't install...
I don't understand why when if I add an undefined object in the service worker code, it throw an error but it works great, and when I came back to my old code (which used to work before), it didn't install.
Maybe, I am doing it wrong somewhere... ?
Thanks
I just ran into this after pulling my hair out for several days.
In my case one of the URLs of the list was returning a 404, which made the entire Cache.addAll return promise reject with the extremely unspecific error TypeError: Request failed ("failed on what, why?!").
If your business logic allows for graceful caching, despite any one of the urls failing, you might want to change your approach to Cache.add of every item of the list:
var urls = ['/', ...]
self.addEventListener('install', function(event) {
event.waitUntil(
caches.open('v1').then(function(cache) {
urls.forEach(function (url) {
cache.add(url).catch(/* optional error handling/logging */);
});
})
);
});