What Is a Service Worker Life Cycle?
If you have worked with Service Workers, A service worker has a life cycle that is completely separate from your web apps page. Angular service worker in your project, use the CLI command
ng add @angular/pwa
Prerequisites to Supports Service workers-
- Browser support
- You need HTTPS
Basically, the Service Worker is a type of Web Worker, and more specifically it’s like a Shared Worker:
- The Service Worker runs in its own global script context
- It isn’t tied to a specific web page
- It cannot access the DOM
One of the main reasons why the Service Worker API is so exciting is that it allows your web apps to support offline experiences, giving developers complete control over the flow.
Lifecycle of a Service Worker
The lifecycle of a service worker is completely separated from your web page one. It consists of the following phases:
- Download
- Installation
- Activation
Download
This is when the browser downloads the
.js file which contains the Service Worker.Installation
To install a Service Worker for your web app, you have to register it first, which you can do in your JavaScript code. When a Service Worker is registered, it prompts the browser to start a Service Worker install step in the background.
By registering the Service Worker, you tell the browser where your Service Worker JavaScript file lives. Let’s look at the following code:
if ('serviceWorker' in navigator) {
window.addEventListener('load', function() {
navigator.serviceWorker.register('/sw.js').then(function(registration) {
// Registration was successful
console.log('ServiceWorker registration successful');
}, function(err) {
// Registration failed
console.log('ServiceWorker registration failed: ', err);
});
});
}
The code checks whether the Service Worker API is supported in the current environment. If it is, the
/sw.js Service Worker is registered.
You can call the
register() method every time a page loads with no concern — the browser will figure out if the service worker has already been registered, and will handle it properly.
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