Скачать или смотреть Efficiently Handle Large Amounts of Form Fields in React using Hooks

Discover techniques for managing large forms in React applications with Hooks. Learn to reduce unnecessary re-renders and enhance performance.
---
This video is based on the question https://stackoverflow.com/q/62336452/ asked by the user 'principiorum' ( https://stackoverflow.com/u/8444956/ ) and on the answer https://stackoverflow.com/a/62336891/ provided by the user 'Pavan' ( https://stackoverflow.com/u/4557914/ ) 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: Dealing with large amount of form fields in React using Hooks

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.
---
Efficiently Handle Large Amounts of Form Fields in React using Hooks

Handling forms in React can become complex, especially when you're dealing with a large number of fields. If you don't manage those fields properly, your application can suffer from performance issues, primarily due to unnecessary re-renders. In this guide, we'll explore an efficient way to handle a large number of form fields in React using Hooks.

The Problem

Recently, a developer encountered a situation where they were using React Hooks to manage form fields that were generated from an array. The goal was to avoid unnecessary re-renders of the component fields that hadn't changed. While exploring solutions, they came across a few dilemmas regarding their implementation.

Common Questions Addressed

Why is it beneficial to have a comparison function when using React.memo?

Are there misconceptions regarding the usage of Hooks in their implementation?

Is their code optimized enough, or are there further improvements that can be made?

Solution Breakdown

Let's dive into how to structure this scenario effectively.

Using useRef for Performance

In the original code, useRef is utilized to maintain an array that represents the form field values. This is a great way to store mutable values that do not directly cause re-rendering when they change:

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

Updating the State

The handler function is wrapped with useCallback to ensure that it retains the same reference between renders. This prevents unnecessary updates to child components wrapped in React.memo:

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

However, it's important to pass the handler directly to MemoizedField, instead of wrapping it again, to preserve the benefits of useCallback:

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

Memoizing Components

The child component, MemoizedField, is wrapped in React.memo. This helps React to optimize rendering by skipping re-rendering when props haven't changed.

However, you might still wonder: should we include a custom comparison function?

Should You Implement a Custom Comparison?

By default, React.memo checks prop references. In the current implementation, you often need to compare the data from props to see if a re-render is necessary. Adding the following custom comparison prevents re-renders when the data hasn't changed:

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

This could help ensure that unnecessary updates are minimized across re-renders.

Custom Hook for Monitoring Renders

To visualize how many times your component has rendered, you can utilize a simple custom hook:

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

In the MemoizedField, add this hook to gain insight into rendering behavior:

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

Final Thoughts

Finally, remember that while you can optimize your form handling in React with hooks, the level of optimization depends on the specific needs of your application. As a good practice, continuously profile and refactor your code to keep performance levels high.

By following the outlined strategies, you can efficiently handle large form fields in React while avoiding pitfalls associated with unnecessary re-renders.

If you have further questions or suggestions, feel free to reach out!