Скачать или смотреть How to Set a Watch Property for Current Time and Initiate Actions in Vue.js

Learn how to effectively manage time-based actions in Vue.js by setting up a watch property for current time and automatically handling token expiry with user logout.
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This video is based on the question https://stackoverflow.com/q/69051012/ asked by the user 'rhythmo' ( https://stackoverflow.com/u/7284645/ ) and on the answer https://stackoverflow.com/a/69051143/ provided by the user 'Nikola Pavicevic' ( https://stackoverflow.com/u/11989189/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Handling Token Expiry in Vue.js with a Watcher on Current Time

In today's fast-paced digital world, managing user sessions effectively is crucial, especially when it comes to handling token expiry. If you're working with Vue.js and need to execute an action when the current time exceeds a pre-set timestamp, you've come to the right place. This guide will guide you on how to implement such functionality using a watch property for the current time.

The Problem Statement

You've likely encountered a situation where you need to log a user out once their session token expires. This can be a complex issue if the application doesn’t actively monitor the current time. In Vue.js, if you don't set a watch property correctly, the application may not react to time changes, leading to unexpected user experiences.

The Solution

To properly handle the situation where the current time checks against a token expiry time, follow these steps:

Step 1: Create a Data Property

Instead of using a computed property for currentTime, switch to a data property that can be updated regularly. Here's how to define it:

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

Step 2: Using the Mounted Hook to Update Time

You'll want to update the currentTime regularly. Utilize the mounted lifecycle hook to set an interval that updates currentTime every second (1000 milliseconds):

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

This interval function will ensure that currentTime is regularly bumped with the actual current time.

Step 3: Set up a Watcher

Next, you need to set up a watcher to respond to changes in the currentTime data property:

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

Break down of the Watcher Logic

Fetch Token Expiry Time: First, check if the token expiry time exists in local storage.

Calculate Time Remaining: Use the moment.js library to calculate how much time remains until expiry.

Conditionally Logout: If the current time exceeds the expiry time, log the user out.

Warning Dialogues: Provide feedback if less than 30 minutes remain until logout, giving the user ample warning before being logged out.

Conclusion

By following the steps above, you can successfully manage session expiry in Vue.js by setting a watch property for the current time. This not only enhances the user experience but also ensures that you maintain security and session integrity within your application.

Feel free to modify the warning dialogues or the time intervals based on your application's specific needs. Happy coding!