Скачать или смотреть Optimize Your Angular Backend Calls: Make One Call for Header and Footer INFO

Discover how to refactor your Angular code to make only a single backend call for header and footer components. Simplify your service and improve performance.
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This video is based on the question https://stackoverflow.com/q/63466587/ asked by the user 'OlehZ' ( https://stackoverflow.com/u/13391231/ ) and on the answer https://stackoverflow.com/a/63466739/ provided by the user 'Akash' ( https://stackoverflow.com/u/3503019/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Optimize Your Angular Backend Calls: Make One Call for Header and Footer INFO

When developing a web application with Angular, one common challenge is managing API calls efficiently. A frequent scenario arises when multiple components, such as a Header and Footer, need the same data from the backend. This can lead to unnecessary duplicate requests, which not only increase loading times but also put extra strain on the server. In this guide, we’ll explore how you can refactor your Angular service to ensure it only makes a single backend call for both components.

The Problem: Multiple API Calls

In our case, we have a service called ContactInfoService that retrieves contact information needed by both a Header and a Footer component. However, each component is making its own call to the service when it initializes, resulting in two API calls to the backend for the same data:

Original Code:

contact-info.service.ts

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header.component.ts

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footer.component.ts

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From the code above, you can see that both the Header and Footer components call the same method to fetch contact information, triggering two requests to the backend.

The Solution: Refactoring the Service

Step 1: Store the Observable in the Service

To solve this issue, we can refactor the ContactInfoService to make a single API call when the service initializes, caching the response using an Observable. Here’s how the revised service looks:

Updated contact-info.service.ts

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Step 2: Use the Cached Observable in Components

After updating the service, you can now simply retrieve the contactInfo$ observable in your components without triggering additional calls. Here’s how the Header and Footer components should now look:

Updated header.component.ts

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Updated footer.component.ts

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Conclusion

By refactoring your Angular service to cache the response of your API calls, you not only streamline the network operations, making only one call to the backend, but also improve your application’s performance and resource management. This approach exemplifies best practices in Angular development, ensuring that your application is both efficient and effective.

Feel free to implement these changes in your Angular project and see the difference it makes! Happy coding!