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mediumMachine Coding

Build an Image Gallery with lightbox

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01

Understand the problem

Build a responsive image grid that opens a full-screen lightbox.

ReactGalleryLightbox
02

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03

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Building an Image Gallery with Lightbox in React

Mental model: A grid of thumbnails plus an overlay (lightbox) that shows one image at a time. The lightbox is driven by a single piece of state: the index of the open image (or null when closed). Prev/next change the index with wrap; Escape and backdrop click

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04

React solution

Complete solutionRun Playground
import React from 'react';
import ImageGallery from './src/ImageGallery';

// Use CSS gradients as stand-in "images" so the demo needs no network.
const images = [
  'linear-gradient(135deg,#2563eb,#7c3aed)',
  'linear-gradient(135deg,#16a34a,#22d3ee)',
  'linear-gradient(135deg,#d97706,#dc2626)',
  'linear-gradient(135deg,#7c3aed,#ec4899)',
  'linear-gradient(135deg,#0891b2,#14b8a6)',
  'linear-gradient(135deg,#f59e0b,#ef4444)',
];

export default function App() {
  return (
    <div style={{ fontFamily: 'sans-serif', padding: 20 }}>
      <h1>Image Gallery Demo</h1>
      <ImageGallery images={images} />
    </div>
  );
}
05

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