Blazor Server Login Page Example

Web Development Software

Blazor Server is a powerful framework that allows for building interactive web applications using C# instead of JavaScript. One common feature in many web applications is the need for user authentication and login functionality. In this article, I will be walking you through an example of how to create a login page using Blazor Server.

First, let’s start by setting up our Blazor Server project. Open your preferred IDE and create a new Blazor Server project. Once the project is created, navigate to the Pages folder and create a new Razor component called LoginPage.razor.

In the LoginPage.razor file, we will define our login page UI. Let’s start by adding a form with two input fields for the username and password, along with a submit button:


<h2>Login Page</h2>

<form>
<label for="username">Username</label>
<input id="username" type="text" @bind="@Username" />

<label for="password">Password</label>
<input id="password" type="password" @bind="@Password" />

<button type="submit">Login</button>
</form>

Next, let’s add the necessary code to handle the form submission and authenticate the user. In the code-behind file for LoginPage.razor, add the following code:


@page "/login"
@code {
private string Username { get; set; }
private string Password { get; set; }

private async Task HandleSubmit()
{
// Perform authentication logic here
if (Username == "admin" && Password == "password")
{
// User is authenticated, redirect to home page
NavigationManager.NavigateTo("/");
}
else
{
// Invalid credentials, display error message
// You can use a toast message or any other UI element to display the error
}
}
}

Now, when the form is submitted, the HandleSubmit() method will be called. Inside this method, you can perform the necessary authentication logic. In this example, we are simply checking if the username is “admin” and the password is “password”. If the credentials are valid, we redirect the user to the home page. Otherwise, we display an error message.

To display the error message, you can use a toast message or any other UI element of your choice. Blazor Server provides a rich set of UI components that you can use for this purpose.

Finally, let’s add a link to the login page from another page. In the Razor component where you want to add the link, you can use the following code:


@page "/home"

Welcome to the Home Page

To access restricted content, please login.

Conclusion

In this article, we explored how to create a login page using Blazor Server. Blazor Server provides a powerful and flexible way to handle user authentication and login functionality in your web applications. By following the steps outlined above, you can easily implement a login page that meets your specific requirements. Remember to handle authentication securely and consider implementing additional security measures such as two-factor authentication to ensure the utmost security for your users.