Progressive Web Application Development by Example

On push notification

User activity and network requests are not the only times you can cache a network resource:

You can also use a push message to initiate caching responses, as shown in the following code:

//On push message 
function parsePushMessage(message){ 
   //parse the message 
   If(message.update){ 
   //notify user of background update process here 
    caches.open(preCacheName).then(cache =>{ 
        return cache.addAll(message.urls); 
    }); 
} 
} 
 
self.addEventListener('push', event => {  
   parsePushMessage(event.data); 
}); 

In this strategy, the push event handler determines the type of message action. If it is a notice to update the application, it initiates ...