Book Image

Progressive Web Application Development by Example

By : Chris Love
Book Image

Progressive Web Application Development by Example

By: Chris Love

Overview of this book

Are you a developer that wants to create truly cross-platform user experiences with a minimal footprint, free of store restrictions and features customers want? Then you need to get to grips with Progressive Web Applications (PWAs), a perfect amalgamation of web and mobile applications with a blazing-fast response time. Progressive Web Application Development by Example helps you explore concepts of the PWA development by enabling you to develop three projects, starting with a 2048 game. In this game, you will review parts of a web manifest file and understand how a browser uses properties to define the home screen experience. You will then move on to learning how to develop and use a podcast client and be introduced to service workers. The application will demonstrate how service workers are registered and updated. In addition to this, you will review a caching API so that you have a firm understanding of how to use the cache within a service worker, and you'll discover core caching strategies and how to code them within a service worker. Finally, you will study how to build a tickets application, wherein you’ll apply advanced service worker techniques, such as cache invalidation. Also, you'll learn about tools you can use to validate your applications and scaffold them for quality and consistency. By the end of the book, you will have walked through browser developer tools, node modules, and online tools for creating high-quality PWAs.
Table of Contents (12 chapters)

Background sync

The service worker cache enables a site to render offline. But that only helps when you have the page and assets available in the cache. What can you do if you need to post data or get uncached pages while offline?

This is where background sync can help. It enables you to register a request that will be fulfilled when the device is back online.

Background sync executes asynchronous tasks in the background, when a device is online. It works by building a queue of requests to fulfill as soon as the device is capable of connecting to the internet.

The way background sync works is you place a network request with a tag, registered with the SyncManager. The platform is responsible for checking if the device is online or offline.

If it cannot make the request, the sync places the request in a queue for that tag. The background sync periodically checks the ability to...