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

Adding validation

We have already touched on the subject of validation; there are some built-in functionalities in the input components as well as EditForm to handle validation.

One way to add validation to our form is to use DataAnnotations. By using data annotations, we don't have to write any custom logic to make sure the data in the form is correct; we can instead add attributes to the data model and let DataAnnotationsValidator take care of the rest.

There are a bunch of DataAnnotations instances in .NET already that we can use; we can also build our own annotations.

Some of the built-in data annotations are as follows:

  • Required: Makes the field required
  • Email: Will check that the entered value is an email address
  • MaxLength: Will check that the number of characters is not exceeded
  • Range: Will check that the value is within a certain range

There are many more annotations that can help us validate our data. To test this out, let's add...