Скачать или смотреть How to Prevent Page Refresh When File Changes in Your React App

Discover how to stop your React app from refreshing entirely when file changes occur during development. Learn the difference between live-reloading and hot-reloading, plus tips to maintain your Redux state!
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How to Prevent Page Refresh When File Changes in Your React App

Are you frustrated with your React or Redux application refreshing every time you save a file? This unexpected behavior can be distracting and counterproductive, especially when you lose all your Redux state. In this guide, we’ll break down why this happens, the difference between live-reloading and hot-reloading, and how you can configure your setup to prevent a full page refresh while maintaining your application state.

The Issue: Page Refreshing on File Change

When you're developing a React app using a local server, saving changes to your files can trigger a page refresh that resets your application. This is known as live-reloading. Here’s what you need to know:

Live-reloading means that every time a file in your project changes, your server restarts and refreshes the app.

This behavior is the default for many setups and can lead to the frustrating loss of state, particularly if you're using libraries like Redux for state management.

The Solution: Using Hot-Reloading Instead

There is a more efficient solution called hot-reloading. Unlike live-reloading, hot-reloading updates only the modules that changed without refreshing the entire application. This means:

The application does not lose its current state.

The React components remain as they are, making for a smoother development experience.

Setting Up Hot-Reloading in Your React Project

If you’ve created your React project using Create React App (CRA), the hot-reloading feature is built-in for CSS files. Here’s how to make it work for JSX files as well:

Locate index.js: Open your index.js file, which is typically found in the src folder of your React application.

Add Hot-Reloading Code: Insert the following code snippet into your index.js:

[[See Video to Reveal this Text or Code Snippet]]

Save Changes: After adding the code, save your JSX file. Now, when you make changes, the updates should be applied immediately without a full page reload.

Maintaining React State with react-hot-loader

Although hot-reloading keeps the state intact for modules, it doesn't preserve the React component state. To tackle this, you can introduce the react-hot-loader library. Here’s what to do:

Install react-hot-loader: Use npm or yarn to add it to your project:

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or

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Configure with Your Components: Use hot from react-hot-loader on the components you want to maintain state. This allows you to enjoy the benefits of hot module replacement while preserving component state during development.

Conclusion

By understanding the distinction between live-reloading and hot-reloading, and by configuring your React project appropriately, you can significantly enhance your development experience. Not only will you avoid unnecessary full-page refreshes that wipe out your Redux state, but you'll also enjoy a more seamless workflow. Give hot-reloading a try in your projects today, and don’t forget to explore the benefits of react-hot-loader for preserving component state!

By following these steps, you’ll be left with a smooth development process, allowing you to focus on creating fantastic features for your applications.