Скачать или смотреть How to Monitor Firebase Email Verification Status Changes in Your VueJs App

Discover how to handle email verification status changes in your Firebase-authenticated VueJs web app, including effective strategies for real-time updates.
---
This video is based on the question https://stackoverflow.com/q/76961591/ asked by the user 'Robert Brax' ( https://stackoverflow.com/u/3118956/ ) and on the answer https://stackoverflow.com/a/76961703/ provided by the user 'Alex Mamo' ( https://stackoverflow.com/u/5246885/ ) 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: Firebase: is there any observer to watch for change in email verification status?

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.
---
Firebase Email Verification Status: How to Keep Your VueJs App Updated

Managing user authentication effectively is crucial for any web application, especially when it comes to email verification. Most developers face a unique challenge when trying to understand how to track changes in a user's email verification status in real-time within their applications. If you're building a VueJs single-page app utilizing Firebase for authentication, you might have encountered this very scenario.

The Problem: A Disjointed User Experience

When a user attempts to verify their email by clicking a link sent to them in their inbox, they are typically redirected to a new tab or window. This can leave the original tab (where your VueJs app is running) unaware of the changes that have occurred, specifically whether the user's email has been verified. This disconnection can lead to confusion for users who expect immediate feedback in the original application without the need for refreshing the page or reloading browser tabs.

Common Approach: Firebase Authentication Events

Many developers assume that Firebase has built-in features for watching user authentication states. The common methods you might have explored include:

onAuthStateChanged(): Triggers when a user's sign-in state changes.

onIdTokenChanged(): Fires when a user's ID token has changed, often presumed to occur when verification status updates, but this is a misconception.

For example, here is a typical snippet you might have tried in your code:

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

While this function provides a mechanism to respond to token changes, it doesn't help in email verification scenarios, leading many to wonder: Is there a better way?

The Solution: Manual Polling with .reload()

Unfortunately, Firebase Authentication does not provide a direct observer for email verification status changes. This occurs due to the external nature of the email verification process. Since clicking the link redirects the user away from their original tab, there is no built-in callback to trigger real-time updates in your application. Here's what you need to know:

Key Insights to Understand

No Real-Time Observer: Firebase cannot currently notify your app of changes that happen in another tab, including email verification status.

Token Refresh Limitations: Firebase refreshes the ID token only once per hour, meaning your app has a window during which it may not have the latest verification status.

Manual Polling Needed: You will have to manually check the verification status.

Implementing a Manual Check

Use the .reload() Method: Firebase provides a .reload() method that can be utilized to refresh the user's information, including the email verification status.

Set Up a Timer or Event to Call Reload: Call the .reload() method at strategic points in your application, such as when relevant user actions occur or at regular intervals.

Here’s how you can implement it:

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

Conclusion: A Workaround for a Common Issue

While Firebase does not currently support a listener for email verification changes directly, using the .reload() method enables your VueJs app to check the user’s verification status and provides a more seamless user experience. It may require some manual effort, but updating the verification status correctly in your original tab can make a significant difference for your users.

By employing this technique, you can ensure that your users feel informed and capable of navigating their experience without confusion, keeping your app's usability at its peak. Keep an eye on updates from Firebase, as they may eventually introduce mor