Book Image

ASP.NET Core 6 and Angular - Fifth Edition

By : Valerio De Sanctis
Book Image

ASP.NET Core 6 and Angular - Fifth Edition

By: Valerio De Sanctis

Overview of this book

Every full-stack ninja needs the tools to operate on front-end and back-end application development. This web app development book takes a hands-on, project-based approach to provide you with all the tools and techniques that web developers need to create, debug, and deploy efficient web applications using ASP.NET Core and Angular. The fifth edition has been updated to cover advanced topics such as Minimal APIs, Web APIs with GraphQL, real-time updates with SignalR, and new features in .NET 6 and Angular 13. You begin by building a data model with Entity Framework Core, alongside utilizing the Entity Core Fluent API and EntityTypeConfiguration class. You'll learn how to fetch and display data and handle user input with Angular reactive forms and front-end and back-end validators for maximum effect. Later, you will perform advanced debugging and explore the unit testing features provided by (.NET 6) and Jasmine, as well as Karma for Angular. After adding authentication and authorization to your apps, you will explore progressive web applications, learning about their technical requirements, testing processes, and how to convert a standard web application to a PWA. By the end of this web development book, you will understand how to tie together the front-end and back-end to build and deploy secure and robust web applications.
Table of Contents (18 chapters)
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Handling the offline status

Now that we have configured a service worker in both of our apps, we can think of a way to handle the offline status message, so that each one of our components will be able to behave in a different way when the app is offline—such as limiting their features and showing an offline status informative message to our users.

To implement these conditional behaviors, we need to find a way to properly determine the browser connectivity status, that is, whether it’s online or not; in the following sections, we’ll briefly review several different approaches that we can use to do that to make the (arguably) best possible choice. These approaches are:

  • The window’s ononline/onoffline event
  • The Navigator.onLine property
  • A third-party package that determines the online/offline status in Angular

We will go into each of these in the following sections.

Option 1 – the window’s ononline/onoffline...