Book Image

Web Development with Blazor

By : Jimmy Engström
Book Image

Web Development with Blazor

By: Jimmy Engström

Overview of this book

Blazor is an essential tool if you want to build interactive web apps without JS, but it comes with its own learning curve. Web Development with Blazor will help you overcome most common challenges developers face when getting started with Blazor and teach you the best coding practices. You’ll start by learning how to leverage the power of Blazor and explore the full capabilities of both Blazor Server and Blazor WebAssembly. Then you’ll move on to the practical part, which is centred around a sample project – a blog engine. This is where you’ll apply all your newfound knowledge about creating Blazor Server and Blazor WebAssembly projects, the inner working of Razor syntax, and validating forms, as well as creating your own components. You’ll learn all the key concepts involved in web development with Blazor, which you’ll also be able to put into practice straight away. By showing you how all the components work together practically, this book will help you avoid some of the common roadblocks that novice Blazor developers face and inspire you to start experimenting with Blazor on your other projects. When you reach the end of this Blazor book, you'll have gained the confidence you need to create and deploy production-ready Blazor applications.
Table of Contents (20 chapters)
1
Section 1:The Basics
4
Section 2:Building an Application with Blazor
14
Section 3:Debug, Test, and Deploy

Custom validation class attributes

By simply using the edit form, input components, and DataAnnotationValidator, the framework will automatically add classes to the components when it's valid and when it's not valid.

By default, these classes are .valid and .invalid. In .NET 5, we are given a way to customize these class names ourselves.

When using Bootstrap, the default class names are .is-valid and .is-invalid and the class names must also have .form-control to get the right styles.

The component we are building next will help us to get the right Bootstrap styling on all of our form components.

We will create our own FieldCssClassProvider to customize what classes Blazor will use:

  1. In the MyBlogServerSide project, right-click in the Components folder and select Add class, and name the class BootstrapFieldCssClassProvider.
  2. Open the new class and add the following code:
    using Microsoft.AspNetCore.Components.Forms;
    using System.Linq;
    namespace MyBlogServerSide...