Скачать или смотреть How to Change a Prop State Between Components in React.js

Learn how to manage state across components in React.js to update props effectively, using state arrays and objects for better performance and clarity.
---
This video is based on the question https://stackoverflow.com/q/77160292/ asked by the user 'PaulKr' ( https://stackoverflow.com/u/21225162/ ) and on the answer https://stackoverflow.com/a/77160359/ provided by the user 'Ahmed Abdelbaset' ( https://stackoverflow.com/u/18079514/ ) 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: Change the state of a prop of a single component which is also in another components react.js

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.
---
Changing State of a Prop in React.js Components

In the world of React.js, managing the state of components effectively can often lead to confusion, especially when trying to manipulate props in sibling or multiple components. This challenge becomes apparent when you have multiple components that rely on shared state but differ in the values displayed. In this guide, we'll explore a specific problem: how to change the value of a prop of a single component, which is also used in another component. Let’s break it down together!

The Problem

Let's say you have two components representing an enemy hand in a game, and both components use a prop called player_money to display the money available to each enemy. Here’s a simplified version of your setup:

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

You also maintain state for playerMoney in the parent component using React’s useState hook:

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

Now, you want to specifically change the playerMoney value for the second EnemyHand (key=3) to signify that it has received some money, let's say 100 dollars. The initial state is 0, and the challenge becomes how to update that specific player’s money without affecting the other components using shared state.

Understanding the Solution

To solve this issue, you can't simply use the same state for both components as that will not allow you to change a single component's prop effectively. Instead, you have a couple of options to manage the state:

1. Create Multiple States for Each Player

You could create individual states for each enemy, but this approach can become cumbersome as the number of components grows. A cleaner way is to manage the money for all players in a structured manner.

2. Use an Array or Object in the State

Using either an array or an object can help keep your code cleaner and more maintainable. Let’s explore both of these approaches.

Using an Object

You can define the playerMoney state as an object with player names as keys:

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

Then, you pass the specific player's money to each EnemyHand:

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

Updating Player Money

Refactor your function to update playerMoney like this:

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

Using an Array

Alternatively, if you prefer an array approach, you can set up your state like so:

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

And render your EnemyHand components as follows:

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

Updating Player Money with IDs

Refactor your money update function to work with the array:

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

Conclusion

Managing state in React can be tricky, but by structuring your state as an array or object, you can easily manipulate props shared across multiple components. Whether it’s using an object with player names or an array with IDs, both methods allow for clear and maintainable code that scales with your application. So the next time you're tackling state management issues, consider these strategies to streamline your component interactions!

By addressing this common situation effectively, you can ensure your React components communicate well and update as expected without unnecessary complexity.