Скачать или смотреть Fixing mat-toolbar Visibility Issue on Page Refresh in Angular Material

Learn how to ensure your Angular Material `mat-toolbar` remains visible even after a page refresh by utilizing local storage in your authentication service.
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Fixing mat-toolbar Visibility Issue on Page Refresh in Angular Material

When building applications using Angular Material, you might encounter issues where certain components, like the mat-toolbar, disappear after a page refresh. This can be especially frustrating for users who expect a consistent interface. In this guide, we will walk you through a solution that ensures your mat-toolbar remains visible by leveraging local storage.

Understanding the Problem

In your Angular application, you have a navigation toolbar defined in your main component. This toolbar is conditionally displayed based on the user's login state. When the user reloads the page, the application's state is reset, meaning the toolbar can disappear if the user is not recognized as logged in again.

The key challenge here is that Angular rebuilds everything from scratch upon a page refreshing. Without a mechanism to persist the user's logged-in state, the toolbar's visibility condition fails, and users are left with a blank navigation.

Solution: Utilizing Local Storage

To solve this issue, we need to make use of local storage to save the user's authentication state. Here’s a step-by-step guide to implement this solution effectively.

1. Update Authentication Logic

We will modify the AuthService to manage the user's authentication state using local storage.

AuthService Implementation

Below is the adjusted version of the AuthService class:

[[See Video to Reveal this Text or Code Snippet]]

In this modified service:

We created a checkSessionStorage method that checks if a token exists in local storage. This method sets the initial value of isLoggedIn$ to true or false based on the token's presence.

We added logic to both the login and logout methods to store and clear the token accordingly.

2. Update Your Main Component

Next, go to your main component where the mat-toolbar is defined. Here’s how to modify it to reflect the updated authentication status.

AppComponent Implementation

Here is how you would implement it in your app.component.ts:

[[See Video to Reveal this Text or Code Snippet]]

In the template (app.component.html), use the async pipe to handle the observable:

[[See Video to Reveal this Text or Code Snippet]]

3. Ensure Local Storage is Working

Make sure that the ngx-webstorage library is installed in your Angular project:

[[See Video to Reveal this Text or Code Snippet]]

Also, don't forget to add it to your app module:

[[See Video to Reveal this Text or Code Snippet]]

Summary

By implementing local storage in your authentication logic, you will ensure that the mat-toolbar remains visible even after the user refreshes the page. This not only improves user experience but also creates a more reliable interface.

If you follow these steps, you’ll end up with a robust authentication flow that keeps the user's logged-in state persistent across page loads. Happy coding!