👀 Views: 128 💬 Answers: 1 📅 Created: 2025-06-07

html react canvas css flexbox JavaScript

I tried several approaches but none seem to work. Hey everyone, I'm running into an issue that's driving me crazy... I'm having an issue with my `<canvas>` element not resizing properly when placed inside a flexbox container in a React 18 application. The `<canvas>` is supposed to fill the available space, but it seems to maintain its initial size, which leads to an incomplete drawing when the window resizes. Here's a simplified version of my code: ```jsx import React, { useRef, useEffect } from 'react'; const MyCanvasComponent = () => { const canvasRef = useRef(null); useEffect(() => { const canvas = canvasRef.current; const context = canvas.getContext('2d'); context.fillStyle = 'blue'; context.fillRect(0, 0, canvas.width, canvas.height); }, []); return ( <div style={{ display: 'flex', width: '100%', height: '100vh' }}> <canvas ref={canvasRef} width={300} height={300} style={{ flex: '1 1 auto' }} /> </div> ); }; export default MyCanvasComponent; ``` In this setup, the `<canvas>` is supposed to adapt to the flex container's dimensions, but it doesn't seem to update its size when the window is resized. I also tried using CSS to set the width and height to 100%, but it didn't resolve the issue either. The drawn blue rectangle appears cut off if I resize the browser window. I verified that my CSS does not have any conflicting rules, and I checked the computed styles in the developer tools, but everything looks fine. The initial size of 300x300 pixels is being retained. I even added an event listener for window resizing, but I didn't want to manage the canvas size manually as it seems unnecessary with React. Does anyone have a clue about how to make the `<canvas>` resize correctly within a flexbox layout in React? Any suggestions or best practices would be greatly appreciated! I'm working on a web app that needs to handle this.