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

JavaScript to .NET

What about the other way around? I would argue that calling .NET code from JavaScript isn’t a very common scenario, and if we find ourselves in that scenario, we might want to think about what we are doing.

I think that as Blazor developers, we should avoid using JavaScript as far as possible. There are, of course, times where JavaScript is the only option, and as I mentioned earlier, Blazm uses communication both ways.

There are three ways of doing a callback from JavaScript to .NET code:

  • Static .NET method call
  • Instance method call
  • Component instance method call

Let's take a closer look at them.

Static .NET method call

To call a .NET function from JavaScript, we can make the function static and we also need to add the JSInvokable attribute to the method.

We can add a function such as this in the code section of a Razor component, or inside a class:

[JSInvokable]
public static Task<int[]> ReturnArrayAsync...