Blazor Event Handling

Blazor is a single-page application (SPA) framework for building interactive client-side web applications using C# instead of JavaScript. Event handling is a crucial part of any web application as it allows developers to handle user interactions such as button clicks, form submissions, and other user actions.

Syntax

Blazor event handling uses the @on directive to bind events to a method in the component's code-behind file. The syntax for the event binding is as follows:

<button @onclick="MethodName">Click Me</button>

Here, the @onclick directive binds the Click event of the button to the MethodName method in the code-behind file.

Example

Let's take an example of a button that displays a message when clicked.

@page "/ButtonClick"

<button @onclick="DisplayMessage">Click Me</button>

@code {
    private void DisplayMessage()
    {
        Console.WriteLine("Button clicked!");
    }
}

Output

When the user clicks the button, the message "Button clicked!" is displayed in the console.

Explanation

In the example above, we're using the @onclick directive to handle the Click event of the button. When the user clicks the button, the DisplayMessage method is called, and it prints the message "Button clicked!" to the console.

Use

Blazor event handling is used to handle user interactions and trigger actions in response to these interactions. You can use it to handle button clicks, form submissions, validation, and other user actions.

Important Points

• Blazor event handling uses the @on directive to bind events to a method in the component's code-behind file.
• The syntax for the event binding is @on<EventName>="<MethodName>".
• The event handler method should be defined in the component's code-behind file.
• You can pass parameters to the event handler method using the $event keyword.

Summary

Blazor event handling is an essential part of any web application. It allows developers to handle user interactions and trigger actions in response to these interactions. By using the @on directive and event handler methods in the component's code-behind file, you can easily add event handling to your Blazor applications.