React has introduced a concept called Suspense that allows for better handling of asynchronous operations, including data fetching. Suspense helps improve the user experience by providing a seamless loading experience while waiting for data to be fetched.

In this blog post, we will explore how to use Suspense with popular data fetching libraries like Axios and Fetch in React.

Table of Contents

1. Introduction to Suspense
2. Setting Up Suspense in React
3. Using Suspense with Axios
4. Using Suspense with Fetch
5. Conclusion
6. References

Introduction to Suspense

Suspense is a feature in React that allows components to wait for some data to load before rendering. It simplifies the handling of asynchronous operations and improves the user experience by avoiding partial UI updates.

Setting Up Suspense in React

To use Suspense, you need to wrap your asynchronous code in a Suspense component and specify a fallback UI while the data is being fetched. Here’s an example of how to set up Suspense in React:

import React, { Suspense } from 'react';

function App() {
  return (
    <div>
      <Suspense fallback={<div>Loading...</div>}>
        {/* Your components with data fetching */}
      </Suspense>
    </div>
  );
}

export default App;

In the above example, we wrap the components with data fetching in the Suspense component and provide a fallback UI that will be displayed while the data is loading.

Using Suspense with Axios

Axios is a popular HTTP client library used for making requests in both Node.js and the browser. To use Suspense with Axios, we can create a custom hook that encapsulates the data fetching logic.

import React, { Suspense } from 'react';
import axios from 'axios';

const fetchData = () => {
  return axios.get('https://api.example.com/data');
};

function DataComponent() {
  const data = fetchData().data;

  return (
    <div>
      {/* Render fetched data */}
    </div>
  );
}

function App() {
  return (
    <div>
      <Suspense fallback={<div>Loading...</div>}>
        <DataComponent />
      </Suspense>
    </div>
  );
}

export default App;

In the above example, we create a custom fetchData function that uses Axios to fetch data from an API. We then use the Suspense component to wrap the DataComponent, providing a fallback UI while the data is being fetched.

Using Suspense with Fetch

Fetch is a built-in JavaScript function for making HTTP requests. To use Suspense with Fetch, we can also create a custom hook that encapsulates the data fetching logic.

import React, { Suspense } from 'react';

const fetchData = () => {
  return fetch('https://api.example.com/data')
    .then(response => response.json());
};

function DataComponent() {
  const data = fetchData();

  return (
    <div>
      {/* Render fetched data */}
    </div>
  );
}

function App() {
  return (
    <div>
      <Suspense fallback={<div>Loading...</div>}>
        <DataComponent />
      </Suspense>
    </div>
  );
}

export default App;

In the above example, we create a custom fetchData function that uses Fetch to fetch data from an API. We then use the Suspense component to wrap the DataComponent, providing a fallback UI while the data is being fetched.

Conclusion

Using Suspense with data fetching libraries like Axios and Fetch can greatly improve the user experience when dealing with asynchronous operations. It simplifies the handling of loading states and provides a smooth loading experience.

By wrapping components that make data fetch requests in a Suspense component and providing a fallback UI, React automatically handles the loading state and renders the fetched data when it’s available.

References

• React Suspense