Скачать или смотреть How to Create a Global User Object in Angular Without Constantly Querying a Database

Learn how to store your user data globally in Angular using local storage, ensuring easy access across components without repeated database queries.
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This video is based on the question https://stackoverflow.com/q/73017902/ asked by the user 'Ryuzu' ( https://stackoverflow.com/u/19569687/ ) and on the answer https://stackoverflow.com/a/73018159/ provided by the user 'iftikharyk' ( https://stackoverflow.com/u/9103067/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Global User Object in Angular Without Database Queries

In web development, efficient data handling is crucial for performance and user experience, especially when using Angular. A common challenge developers face is managing a user object that is needed across multiple components. For instance, you may want to avoid making repeated database queries every time you need user information. In this post, we will explore a solution to create a global user object that persists across your Angular application without the need to query the database each time.

The Problem: Constant Database Queries

When you need to access user information in various components of your application, fetching this data from a database multiple times is not only inefficient but can also degrade the user experience. Consider the following scenario, where a User object must be retrieved in two different components:

Example Code Snippet

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In this example, both WorkReportComponent and WorkDetailComponent make calls to fetch user data from the WeekService. This duplication can introduce unnecessary load on your server and slow down the application responsiveness.

The Solution: Using Local Storage

A practical solution to this problem is to utilize local storage to store the user object. This way, you can retrieve the user data without making a new request to the database every time a component is loaded.

Steps to Implement Local Storage

Store the User Object: When you successfully retrieve the user data from the database, save it in the browser's local storage as a string.

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Retrieve the User Object: Whenever you need to use the user object in any component, you can simply parse the data from local storage.

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Accessing User Data Across Components: Now, each component can access the user data without needing to fetch it from the server again. You can create a utility service to handle the user data operations if desired.

Benefits of Using Local Storage

Performance Improvement: Reduces the number of API calls, hence improving performance and responsiveness of the application.

Persistent Data: The data stored in local storage remains even when the user refreshes the page, which means the user's information persists throughout their session.

Simplicity: Easy to implement without changes to your existing service structure.

Conclusion

By storing your user object in local storage, you can efficiently manage user data across your Angular application without the need for repeated database queries. This approach not only optimizes your application's performance but also enhances the user experience. Implementing this simple solution can be a game-changer, especially for larger applications where component interaction is frequent.

Start using local storage in your Angular applications today, and take a step towards smarter data management!