👀 Views: 87 💬 Answers: 1 📅 Created: 2025-07-02

react css animation conditional-rendering javascript

I'm trying to figure out I'm a bit lost with Quick question that's been bugging me - I'm working on a project and hit a roadblock. I'm working on a project and hit a roadblock... I'm facing an issue with CSS animations not playing as expected when conditionally rendering components in my React application. Specifically, I have a modal that I want to fade in and out based on a state variable. The modal should animate smoothly when it appears or disappears, but instead, it flickers and sometimes does not animate at all. I've implemented this using `useState` to manage the visibility of the modal and `CSSTransition` from the `react-transition-group` library for handling animations. My current setup looks like this: ```javascript import React, { useState } from 'react'; import { CSSTransition } from 'react-transition-group'; import './Modal.css'; // CSS for animations const Modal = () => { const [showModal, setShowModal] = useState(false); const toggleModal = () => setShowModal(!showModal); return ( <div> <button onClick={toggleModal}>Toggle Modal</button> <CSSTransition in={showModal} timeout={300} classNames="fade" unmountOnExit > <div className="modal">This is a modal</div> </CSSTransition> </div> ); }; export default Modal; ``` The CSS for the fade animation is as follows: ```css .fade-enter { opacity: 0; } .fade-enter-active { opacity: 1; transition: opacity 300ms; } .fade-exit { opacity: 1; } .fade-exit-active { opacity: 0; transition: opacity 300ms; } .modal { background: white; padding: 20px; border: 1px solid #ccc; position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); z-index: 1000; } ``` However, when I toggle the modal, it sometimes appears with a noticeable flicker, and occasionally the animation doesn’t trigger at all. I’ve checked to ensure that the `CSSTransition` component's `in` prop is being updated correctly, and I am using version 2.1.0 of `react-transition-group`. I suspect that there might be an issue with the timing of when the modal is being rendered or removed from the DOM. Has anyone encountered a similar issue? Any tips on how to properly manage CSS transitions in conditional rendering without the flickering effect? What best practices should I follow to ensure a smooth user experience? This is part of a larger web app I'm building. What am I doing wrong? This is part of a larger web app I'm building. What's the best practice here? For context: I'm using Javascript on Ubuntu. How would you solve this? I'm developing on Windows 10 with Javascript. My development environment is Debian. I'm working on a application that needs to handle this. Thanks in advance!