React 18: Difficulties with Dynamic Class Names in Conditional Rendering of Components
I'm learning this framework and I'm having trouble with I'm currently working on a React 18 project where I need to conditionally render a list of components with dynamic class names based on the state. I have a parent component that renders a list of child components, and I want to apply a different class to each child based on its state. However, I'm encountering an issue where the class names do not update as expected when the state changes, leading to incorrect styling in the UI. Here’s a simplified version of my code: ```jsx import React, { useState } from 'react'; const Child = ({ isActive }) => { return <div className={isActive ? 'active' : 'inactive'}>Child Component</div>; }; const Parent = () => { const [activeIndex, setActiveIndex] = useState(null); const handleToggle = (index) => { setActiveIndex(activeIndex === index ? null : index); }; const children = [0, 1, 2, 3].map((index) => ( <div key={index} onClick={() => handleToggle(index)}> <Child isActive={index === activeIndex} /> </div> )); return <div>{children}</div>; }; export default Parent; ``` When I click on a child component, the expected behavior is that it should toggle its class name from 'inactive' to 'active' or vice versa. However, I noticed that clicking multiple times rapidly makes the class names inconsistent. Also, when I inspect the DOM, the class names do not seem to reflect the active state correctly after several clicks. I've tried adding a `console.log` statement inside the `Child` component to see the `isActive` prop, and it correctly reflects the state. However, the rendered class names in the DOM are not updating accordingly. I've also ensured that the component is not being unmounted and remounted unnecessarily. I’m not using any external libraries for state management and the components are quite simple. Is there something I’m missing in regards to state updates or component re-renders? Any help would be greatly appreciated! This is for a REST API running on Ubuntu 20.04. Has anyone else encountered this? Thanks for your help in advance!