React useIsomporphicEffect Hook

Introduction

In this lab, we will be exploring the use of the useIsomorphicEffect hook in React. This hook allows for the resolution of useEffect() on the server and useLayoutEffect() on the client, ensuring that the same effect is executed regardless of the environment. Through this lab, we will learn how to use the useIsomorphicEffect hook to create consistent and reliable effects in our React applications.

Skills Graph

React useIsomporphicEffect Hook

index.html and script.js have already been provided in the VM. In general, you only need to add code to script.js and style.css.

To ensure the proper use of useEffect() on the server and useLayoutEffect() on the client, you can use typeof to check if the Window object is defined. If it is, return useLayoutEffect(), otherwise return useEffect(). Here is an example of how to implement this:

const useIsomorphicEffect =
  typeof window !== "undefined" ? React.useLayoutEffect : React.useEffect;

Then, in your code, you can use useIsomorphicEffect() as shown in this example:

const MyApp = () => {
  useIsomorphicEffect(() => {
    window.console.log("Hello");
  }, []);

  return null;
};

ReactDOM.createRoot(document.getElementById("root")).render(<MyApp />);

This will log 'Hello' in the console when the component mounts, and will work correctly on both the server and the client.

Please click on 'Go Live' in the bottom right corner to run the web service on port 8080. Then, you can refresh the Web 8080 Tab to preview the web page.

Summary

Congratulations! You have completed the React useIsomporphicEffect Hook lab. You can practice more labs in LabEx to improve your skills.