Скачать или смотреть How to Sync the Ngxs State Data Across All Tabs Using Local Storage

Discover how to achieve real-time synchronization of your `Ngxs` state data across multiple tabs in your Angular application.
---
This video is based on the question https://stackoverflow.com/q/73198953/ asked by the user 'Abir Mahmud' ( https://stackoverflow.com/u/13820302/ ) and on the answer https://stackoverflow.com/a/73213308/ provided by the user 'Abir Mahmud' ( https://stackoverflow.com/u/13820302/ ) 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: How to sync the state data saved in localstorage across all tabs using `Ngxs` state management?

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 Sync the Ngxs State Data Across All Tabs Using Local Storage

When building applications using Angular, managing and synchronizing state data can often present challenges, especially when dealing with multiple tabs. One common scenario is when you make changes in one tab, but the other tabs do not reflect those changes until they are refreshed. In this guide, we will explore how to sync the state data saved in local storage across all tabs using the Ngxs state management library.

The Problem Contained in LocalStorage

Imagine you have an Angular application where you're using Ngxs to manage your application's state. You implement local storage to persist this state so that it can survive page refreshes. Here's the initial portion of your AppModule where you set up Ngxs with local storage:

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

With this setup, you effectively call localStorage to save your application's state. However, if a user modifies data in one tab, the changes do not propagate automatically to other open tabs. The user must refresh these other tabs to load the latest state.

Why Does This Happen?

The reason for this lag in state synchronization is that local storage events do not trigger a change detection in Angular automatically. Consequently, changes made in one tab don't prompt the other tabs to update unless they are explicitly refreshed.

The Solution: Using the Storage Event

The good news is that we can leverage the storage event to listen for changes made to localStorage. When the data changes in one tab, it will trigger this event in all other tabs, allowing us to update them accordingly.

Implementing the Storage Listener

To solve this problem, you can implement an event listener in your main component to subscribe to the storage event. Here's how you can do it:

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

Breakdown of the Code

ngAfterContentInit: This lifecycle hook is invoked after Angular has fully initialized a component's content. It’s a good time to set up subscriptions.

fromEvent: This function is part of RxJS which allows us to convert DOM events into observables.

subscribe: When another tab updates local storage, it triggers the storage event. The callback here will execute the code to reset the state in your Ngxs store.

reset method: The Ngxs store reset functionality replaces the current state with the new state obtained from local storage.

Advantages of This Approach

Real-time Sync: Every tab reflecting the current state as soon as a change is made in one tab.

User-Friendly Experience: No more refreshing the tabs manually; everything updates seamlessly.

Final Thoughts

By following the solution outlined above, you can drastically improve the user experience in your Angular application by ensuring that Ngxs state data is always in sync across tabs. We often take synchronization for granted, but with a bit of code and the right approach, you can handle it effectively!

Takeaways

Always ensure your application handles state management dynamically, especially when multiple tabs might be open.

Utilize the power of observables and RxJS to efficiently manage events and synchronization.

Implementing this solution will save your users from the frustration of inconsistent state data while using your application across multiple tabs. Happy coding!