Скачать или смотреть How to Access the State of Other Components in React

Learn how to retrieve the state from multiple child components in React and manage them effectively in a parent component.
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This video is based on the question https://stackoverflow.com/q/64478508/ asked by the user 'virendra parade' ( https://stackoverflow.com/u/11130264/ ) and on the answer https://stackoverflow.com/a/64479052/ provided by the user 'theabrar' ( https://stackoverflow.com/u/14492980/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Access the State of Other Components in React: A Beginner's Guide

If you're new to React, managing component state can sometimes feel tricky, especially when you want to access or read the state of multiple child components from a parent component. In this guide, we’ll explore how to effectively access and manage the state of child components within a parent component in React.

Understanding the Problem

In our example, we have four components: A, B, C, and D. Here’s a brief overview of their relationships:

Component A is the parent of Component B.

Component B acts as the parent to Component C and Component D.

The Challenge

The challenge here is that you want Component A to read and store the states of Component B, C, and D into its own state. Let’s break down how we can achieve this.

Solution Approach

To solve this problem, we can take the following approach:

Create shared state in Component A: This will allow us to store the states of all components.

Pass down the state and any necessary functions as props: This allows child components to communicate back to the parent component.

Let’s look at the implementation of this solution step by step.

Step 1: Defining State in Component A

In Component A, we will define the initial states that we want to manage. We will also create a function to update these state values.

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

Step 2: Implementing Component B

Component B will receive props from Component A. It will then pass down the relevant props to Component C and Component D.

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

Step 3: Setup Component C and D

Components C and D can then render using the properties they're given:

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

Conclusion

By following this structure, Component A can easily manage and access the states of Component B, C, and D. This technique of lifting state up allows for better state management and enables components to communicate effectively.

Feel free to adjust the logic in the onChange function to update state based on your application’s requirements!

Now, you should have a clearer understanding of how to manage state across components in React. Happy coding!