Handling asynchronous data in React is crucial for creating modern and dynamic applications. React introduces the Suspense component to help manage the data loading process efficiently and provide a better user experience during the wait. In this chapter, we will learn how to use Suspense in the context of data fetching and look at some practical cases.

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What is Suspense in React?

Suspense is a React component that allows displaying a waiting interface while loading asynchronous resources, such as data from an API. This functionality improves the user experience by preventing incomplete or unwanted elements from being displayed during the loading time.

Basic Implementation of Suspense

To use Suspense in data loading, we need an "asynchronous resource." Although Suspense does not directly support promises, data handling libraries or tools like react-query or Relay can be used. We can also simulate the behavior of Suspense using a basic resource in this example.

Example of Suspense with a Loading Component

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Suspense for Data Loading with Libraries

Libraries like react-query or Relay can work with Suspense to simplify the loading and management of asynchronous data. Using react-query, for example, we can combine data loading hooks with Suspense to improve user experience and performance.

Example with Suspense and React Query

In this example, we use Suspense and react-query to handle data loading and display a message while awaiting the response:

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Creating Asynchronous Resources with Suspense

For situations where data management libraries are not used, a custom resource function can be created to simulate the behavior of Suspense in data loading.

Example of a Custom Asynchronous Resource

Here we create a resource that simulates data loading and wrap it in Suspense:

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Good Practices with Suspense

• Use Suspense at High-Level Components: Place Suspense at high-level components to avoid multiple loading messages simultaneously on the same page.
• Combine with Data Management Libraries: Use libraries like react-query or Relay that natively support Suspense to simplify implementation.
• Provide Informative Fallbacks: The waiting messages in fallback should be informative and appealing to improve the user experience during loading.

Conclusion

Suspense in React allows effective data loading management, displaying waiting messages and improving the user experience. In this chapter, we explored how to use Suspense for data fetching, including basic and advanced examples.