Book Image

Blazor WebAssembly by Example, 2e - Second Edition

By : Toi B. Wright
5 (1)
Book Image

Blazor WebAssembly by Example, 2e - Second Edition

5 (1)
By: Toi B. Wright

Overview of this book

Blazor WebAssembly helps developers build web applications without the need for JavaScript, plugins, or add-ons. With its continued growth in popularity, getting started with Blazor now can open doors to new career paths and exciting projects – and Blazor WebAssembly by Example will make your first steps easier. This is a project-based guide that will teach you how to build single-page web applications with Blazor, focusing heavily on the practical over the theoretical by providing detailed step-by-step instructions for each project. The author also includes a video for each project showing her following the step-by-step instructions, so readers can use them if they're unsure about any particular step. In this updated edition, you'll start by building simple standalone web applications and gradually progress to developing more advanced hosted web applications with SQL Server backends. Each project will cover a different aspect of the Blazor WebAssembly ecosystem, such as Razor components, JavaScript interop, security, event handling, debugging on the client, application state, and dependency injection. The book’s projects get more challenging as you progress, but you don’t have to complete them in order, which makes this book a valuable resource for beginners as well as those who just want to dip into specific topics. By the end of this book, you will have experience and lots of know-how on how to build a wide variety of single-page web applications with .NET, Blazor WebAssembly, and C#.
Table of Contents (15 chapters)
13
Other Books You May Enjoy
14
Index

Locking navigation

How many times have you completed a form and forgotten to save it before navigating to another page? It happens to everyone. The NavigationLock component can be used to notify the user that they are about to navigate away from the current page and allow them to cancel that action. It does that by intercepting navigation events.

This is a sample NavigationLock:

<NavigationLock ConfirmExternalNavigation="true"
    OnBeforeInternalNavigation="HandleBeforeInternalNav" />

The NavigationLock class includes two properties:

  • ConfirmExternalNavigation – gets or sets whether the user should be asked to confirm external navigations. The default value is false.
  • OnBeforeInternalNavigation – gets or sets the callback that is invoked when an internal navigation event occurs.

This is a sample method that is invoked from the OnBeforeInternalNavigation property:

private async Task HandleBeforeInternalNav...