Unexpected UI Flickering in React with Conditional Rendering of Components
After trying multiple solutions online, I still can't figure this out. I've been struggling with this for a few days now and could really use some help. Hey everyone, I'm running into an issue that's driving me crazy. I'm experiencing an annoying flickering scenario in my React application when conditionally rendering components based on user input. I'm using React 17.0.2 and functional components with hooks. The scenario arises when I try to toggle a dropdown menu that displays additional options based on the user's selection. The dropdown flickers and briefly shows the entire component tree instead of just the intended content. Here’s a simplified version of my code: ```javascript import React, { useState } from 'react'; const Dropdown = () => { const [isOpen, setIsOpen] = useState(false); const [selectedOption, setSelectedOption] = useState(''); const toggleDropdown = () => { setIsOpen(prev => !prev); }; const handleOptionSelect = (option) => { setSelectedOption(option); setIsOpen(false); }; return ( <div className="dropdown"> <button onClick={toggleDropdown}>Select an option</button> {isOpen && ( <div className="dropdown-menu"> <div onClick={() => handleOptionSelect('Option 1')}>Option 1</div> <div onClick={() => handleOptionSelect('Option 2')}>Option 2</div> </div> )} {selectedOption && <p>You selected: {selectedOption}</p>} </div> ); }; export default Dropdown; ``` I’ve tried various solutions, like using `React.memo()` for the dropdown menu to prevent unnecessary re-renders, but the flickering continues. The console doesn’t show any specific errors, just warnings about the rendering lifecycle, which makes it hard to pinpoint the scenario. It seems to be more pronounced on slower devices or when the component tree is larger. Has anyone encountered similar flickering issues with conditional rendering in React? Any suggestions on how to resolve this? Are there specific best practices I should follow to avoid UI flickering in such cases? Any ideas what could be causing this? This is for a microservice running on macOS. I'm working with Javascript in a Docker container on Ubuntu 22.04. Hoping someone can shed some light on this. Thanks in advance!