How to implement a global loading spinner for API requests in React



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Implementing a global loading spinner for API requests in a React application involves intercepting API requests and responses to manage the loading state globally. You can achieve this by creating an HTTP interceptor using Axios, a popular HTTP client, combined with React context and state management. Here's a basic example of how you can implement a global loading spinner:

  1. Set up Axios with Interceptors:

    First, set up Axios with request and response interceptors to manage the loading state globally. Install Axios if you haven't already:

    bash
    npm install axios

    Then, create a file (e.g., axiosInstance.js) to configure Axios:

    javascript
    import axios from 'axios';

const axiosInstance = axios.create();

// Request interceptor
axiosInstance.interceptors.request.use((config) => {
  // Set loading to true or show loading spinner
  // You can dispatch an action to set loading state globally here
  return config;
}, (error) => {
  return Promise.reject(error);
});

// Response interceptor
axiosInstance.interceptors.response.use((response) => {
  // Set loading to false or hide loading spinner
  // You can dispatch an action to set loading state globally here
  return response;
}, (error) => {
  // Set loading to false or hide loading spinner
  // You can dispatch an action to set loading state globally here
  return Promise.reject(error);
});

export default axiosInstance;

  2. Use React Context for Loading State:

    Create a React context to manage the loading state globally. Create a file (e.g., LoadingContext.js):

    javascript
    import React, { createContext, useState } from 'react';

export const LoadingContext = createContext();

export const LoadingProvider = ({ children }) => {
  const [loading, setLoading] = useState(false);

  return (
    <LoadingContext.Provider value={{ loading, setLoading }}>
      {children}
    </LoadingContext.Provider>
  );
};

  3. Wrap Your App with the Loading Provider:

    Wrap your application with the LoadingProvider to make the loading state available to all components:

    javascript
    import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import { LoadingProvider } from './LoadingContext';

ReactDOM.render(
  <React.StrictMode>
    <LoadingProvider>
      <App />
    </LoadingProvider>
  </React.StrictMode>,
  document.getElementById('root')
);

  4. Use the Loading Context in Your Components:

    In your components, you can use the LoadingContext to access the loading state and conditionally render a loading spinner:

    javascript
    import React, { useContext } from 'react';
import { LoadingContext } from './LoadingContext';

const MyComponent = () => {
  const { loading } = useContext(LoadingContext);

  return (
    <div>
      {loading && <div>Loading...</div>}
      {/* Your component content */}
    </div>
  );
};

export default MyComponent;

With this setup, Axios interceptors manage the loading state globally by setting it to true before making a request and setting it to false after receiving a response or encountering an error. The loading state is then made available to all components using React context, allowing you to conditionally render a loading spinner wherever needed.

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