Скачать или смотреть How to Use Angular Auth Guards to Route Back to the Previous Page After Login

Learn how to implement `Angular Auth Guards` to dynamically route users back to the page they were trying to access after successful login, avoiding hard-coded URLs.
---
This video is based on the question https://stackoverflow.com/q/62698851/ asked by the user 'Richard' ( https://stackoverflow.com/u/6561309/ ) and on the answer https://stackoverflow.com/a/62699234/ provided by the user 'Danilo Torchio' ( https://stackoverflow.com/u/5264995/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Angular Auth Gaurds - rout to previous page

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Use Angular Auth Guards to Route Back to the Previous Page After Login

Managing user authentication in Angular applications can sometimes lead to challenges, particularly when it comes to ensuring a smooth user experience. One common scenario is needing to redirect users back to the page they were attempting to access before being prompted to log in. In this guide, we'll walk through how to accomplish this using Angular Auth Guards without hard-coding URLs.

Understanding the Problem

Let's say you have set up your Angular application with a few routes protected by Auth Guards. The objective is to ensure that if a user is not authenticated and tries to access a route like /approval-list, they are redirected to the login page. Upon successful login, instead of redirecting them to a hard-coded route like /approval-list, you'd like them to go back to the route they were originally trying to access.

Current Route Configuration

Here’s a simplified version of how your route configuration may look:

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

In this setup, if a user tries to access the /approval-list, the ApprovalListGuard will redirect them to the login page if they are not authenticated.

The Solution

Let's enhance the ApprovalListGuard and the LoginComponent to handle this routing dynamically.

Updating the Auth Guard

In your ApprovalListGuard, you should modify how you navigate to the login page. Specifically, you can pass the intended route as a query parameter:

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

Using ActivatedRoute in LoginComponent

To utilize the backUrl parameter upon successful login, you will need to make a few adjustments in your LoginComponent.

Inject the ActivatedRoute: This gives you access to the route parameters.

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

Create a Property to Retrieve the backUrl: This will help you easily get the intended URL from the query parameters.

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

Redirecting after Successful Login: In your login method, you can now direct users back to the route they were trying to access:

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

Summary of Changes Made

Updated ApprovalListGuard to pass the intended route as a queryParam when redirecting to the login page.

Modified LoginComponent to read the backUrl and navigate users back to it after a successful login.

Conclusion

By following these steps, you've now created a more user-friendly authentication experience that remembers where users came from. This eliminates hard-coded URLs and makes your application more versatile and maintainable.

Incorporating these techniques into your Angular projects ensures that you provide a better user experience, keeping users engaged and minimizing frustration during the login process. If you have any questions or need further clarification, feel free to reach out!