Скачать или смотреть How to Automatically Reload Angular 9 Menu Items on Data Changes

Learn how to effectively `reload menu items in Angular 9` dynamically on user login. Understand the best practices using Auth Guards and BehaviorSubject for an optimal user experience.
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This video is based on the question https://stackoverflow.com/q/62965987/ asked by the user 'surjendu_dey' ( https://stackoverflow.com/u/12676390/ ) and on the answer https://stackoverflow.com/a/62966257/ provided by the user 'Sunny Goel' ( https://stackoverflow.com/u/10346580/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Automatically Reload Angular 9 Menu Items on Data Changes

In web application development, user experience is of utmost importance. When users log in, they expect the navigation menus to reflect their new permissions or roles seamlessly. However, many developers encounter issues where elements, like button states or displayed information, do not update automatically without a page refresh. In this guide, we will focus on how to solve this specific problem using Angular 9.

Understanding the Problem

When a user logs into an Angular application, a dynamic change often must occur in the user interface — like updating menu items to show the username or displaying different navigation options. In the case presented, when a user logs in, the menu does not reflect the user's status until the page is manually refreshed. This behavior can frustrate users and diminish the overall experience.



Solution Overview

To resolve the issue of dynamic updates in Angular 9, you can leverage Angular's Auth Guards alongside BehaviorSubjects from RxJS. This will allow you to emit changes effectively and listen for these changes in the relevant components without the need to refresh the page manually.

Step-by-Step Solution

Let’s break down the solution into clear sections.

1. Utilize an Auth Guard

First, create an Auth Guard to handle user authentication. This guard will check if the user is authenticated and should redirect the user after login while updating the menu with appropriate values.

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

2. Dynamic Menu Data Update

In the Dashboard Component, you will subscribe to the BehaviorSubject provided by your Side Menu Service. This allows you to receive dynamic updates whenever the data changes.

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

3. Code Snippets for Clarity

From the initial code snippets you provided, we will make minor adjustments to accommodate our solution based on the new Auth Guard and service. Here is how the relevant parts look after the improvements:

HTML Structure Example:

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

TypeScript Component Logic:

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



Conclusion

By utilizing Auth Guards alongside BehaviorSubjects, you can create a much smoother and more responsive user experience in your Angular 9 application. The key takeaway is to properly manage the state of your components concerning user authentication, ensuring that updates propagate throughout the application without requiring full page reloads.

Implement the above strategies to effectively manage dynamic menu updates efficiently. Happy coding!