Скачать или смотреть How to Achieve React Functional Component Communication Between Parent and Child

Learn how to easily communicate between React functional components by making a child component respond to parent state changes.
---
This video is based on the question https://stackoverflow.com/q/65723628/ asked by the user 'smul.hn' ( https://stackoverflow.com/u/14493942/ ) and on the answer https://stackoverflow.com/a/65723859/ provided by the user 'pritam' ( https://stackoverflow.com/u/1263904/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: React functional component communication

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Effective Communication Between Parent and Child Components in React

As a beginner in React development, it's common to encounter challenges when trying to establish communication between parent and child components. One common scenario is needing to execute a function in a child component based on a change in the parent component's state. If you're working on a React web application and facing this challenge, you're in the right place! In this guide, we'll break down how to make your child component respond to state changes in the parent component effectively.

The Problem

Imagine this situation: you have a parent component that manages some state, and you want to call a function in the child component whenever that state changes. The traditional approach might seem convoluted, especially for those who are just starting with React. You might have tried using contexts or other complex patterns without success. Let’s clarify how to simplify this process.

The Solution

The most straightforward way to achieve communication from a parent to a child component is by passing the relevant state as props. This approach makes it easy for the child component to react every time the parent’s state changes.

Here’s how to break it down:

1. Pass State as Props

You can pass the state variable from the parent component to the child, and then use it effectively within your child component.

Example Code

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

2. Implement useEffect in the Child

By using the useEffect hook in the child component, you can listen for changes to the props (in this case, var) that the parent passes down. Whenever var changes, the doSomething function will automatically execute.

Key Points

Isolation of Components: This method keeps your parent and child components isolated while still allowing them to communicate effectively.

React Hooks: Utilizing useEffect in the child enables you to perform side effects based on the parent’s state changes without cluttering the parent’s logic.

3. Why This Approach Works

This technique works well for several reasons:

Simplicity: Using props is a straightforward method for passing data and triggering functions.

Reusability: You mention that you're using the child component in multiple places. By passing in props, you maintain the reusability of the child component without altering its internal logic.

Clear Logic Flow: The flow of information is clear from the parent to the child, making the code easier to read and maintain.

Conclusion

In conclusion, establishing communication between parent and child components in React is manageable with the right approach. By passing state as props and leveraging React's useEffect, you can ensure that changes in the parent’s state trigger necessary actions in the child component. This not only simplifies your codebase but also enhances collaboration among your app's components.

If you're just getting started with React, remember: It's common to have questions as you learn, and there's no such thing as a stupid question! Happy coding!