Скачать или смотреть How to Dynamically Change the className of a Nested React Component Without Using Refs

Discover an easy method to change the `className` of nested React components based on user actions without using refs for better code organization.
---
This video is based on the question https://stackoverflow.com/q/63885115/ asked by the user 'Angel' ( https://stackoverflow.com/u/12234006/ ) and on the answer https://stackoverflow.com/a/63885797/ provided by the user 'Pablo Darde' ( https://stackoverflow.com/u/1703696/ ) 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: Is there a way to change the className of an already existing react component?

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.
---
How to Dynamically Change the className of a Nested React Component Without Using Refs

When developing a React application, you might run into a scenario where you need to change a className of a deeply nested component based on user input from a higher-level component. For example, consider a situation where you have three components: Component1, Component2, and Component3. You want to change the class of Component3 whenever a user interacts with a radio button in Component1.

Many developers instinctively think of using refs to manage this kind of interaction. However, relying on refs can make your code verbose and difficult to maintain, especially when dealing with multiple components. Fortunately, there’s a cleaner way to achieve this functionality without using refs.

Understanding the Components

Let’s break down the structure of our components:

Component1: The top-level component that will handle user input (e.g., a radio button or checkbox).

Component2: A wrapper component that receives a class name as a prop and passes it down to Component3.

Component3: The lowest-level component that receives the class name and applies it to a <div>.

The Solution

Step 1: Define State in the Top Component

In Component1, you will use the React useState hook to manage the state of the className. You can toggle this state based on user interactions.

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

Step 2: Pass Props to Child Components

In Component2, accept the mainClass prop and pass it down to Component3.

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

Step 3: Apply the Class Name in the Lowest Component

In Component3, you can apply the mainClass prop directly to your <div>.

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

Step 4: Render the Component

Finally, render Component1 in your HTML, making sure to include the necessary React libraries:

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

Example CSS

You will also want to define styles for the different states to visualize the changes properly:

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

Final Rendering

Make sure your React app renders without errors by including all the components correctly.

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

Conclusion

Using this method allows you to dynamically change the className of a deeper nested component without the hassle of using refs. By leveraging React's state and props, you can maintain clean and readable code across your component structure.

This approach not only keeps your components decoupled but also improves maintainability, making it easier for future developers (or yourself) to understand the flow of data and styles in your application.

Now you are all set to implement this solution in your React project! Happy coding!