Book Image

Blazor WebAssembly by Example

By : Toi B. Wright
Book Image

Blazor WebAssembly by Example

By: Toi B. Wright

Overview of this book

Blazor WebAssembly makes it possible to run C# code on the browser instead of having to use JavaScript, and does not rely on plugins or add-ons. The only technical requirement for using Blazor WebAssembly is a browser that supports WebAssembly, which, as of today, all modern browsers do. Blazor WebAssembly by Example is a project-based guide for learning how to build single-page web applications using the Blazor WebAssembly framework. This book emphasizes the practical over the theoretical by providing detailed step-by-step instructions for each project. You'll start by building simple standalone web applications and progress to developing more advanced hosted web applications with SQL Server backends. Each project covers a different aspect of the Blazor WebAssembly ecosystem, such as Razor components, JavaScript interop, event handling, application state, and dependency injection. The book is designed in such a way that you can complete the projects in any order. By the end of this book, you will have experience building a wide variety of single-page web applications with .NET, Blazor WebAssembly, and C#.
Table of Contents (11 chapters)

EventCallback parameters

An event callback is a method that you pass to another method to be called when a particular event occurs. For example, when the button on the Alert component is clicked, the @onclick event uses the OnOk parameter to determine the method that should be called. The method that the OnOK parameter references is defined in the parent component.

EventCallback parameters are used to share information from the child component to the parent component. They share information with their parent and notify their parent when something, such as a button click, has occurred. The parent component simply specifies the method to call when the event is triggered.

This is an example of an EventCallback parameter:

[Parameter] public EventCallback OnOk { get; set; }

The following example uses a lambda expression for the OnOk method. When the OnOk method is called, the value of the showAlert property is set to false:

<Alert Show="showAlert" OnOk=&quot...