JSFiddle - React, Tailwind, and code Playground

by stitot

HTML

<!doctype html>
<html>
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width,initial-scale=1" />
  <title>Simple Virtualized DataGrid</title>
  <style>
    body { font-family: system-ui, sans-serif; margin: 16px; }
    .grid {
      border: 1px solid #ddd;
      width: 100%;
      max-width: 1100px;
    }
    .header, .row {
      display: grid;
      grid-template-columns: repeat(20, minmax(80px, 1fr));
      align-items: center;
    }
    .header {
      position: sticky;
      top: 0;
      background: #fafafa;
      z-index: 2;
      border-bottom: 1px solid #eee;
      font-weight: 600;
    }
    .cell {
      padding: 6px 8px;
      border-right: 1px solid #f0f0f0;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    .row .cell:last-child, .header .cell:last-child { border-right: 0; }
    .scroller {
      height: 480px;
      overflow: auto;
      position: relative;
    }
    .spacer {
      position: relative;
      width: 100%;
    }
    .rowsLayer {
      position: absolute;
      left: 0;
      right: 0;
      top: 0;
      will-change: transform;
      contain: layout paint;
    }
    .row {
      border-bottom: 1px solid #f3f3f3;
      box-sizing: border-box;
    }
    .row:nth-child(even) { background: #000; }
    .row:hover { background: #f3f7ff; }
  </style>
</head>
<body>

<div class="grid" id="grid"></div>

<script>
  // --- Demo data (replace with your real data access) ---
  const ROWS = 100000;
  const COLS = 20;

  function getCellValue(rowIndex, colIndex) {
    // Keep this fast. In real life, read from arrays/typed arrays/etc.
    return `R${rowIndex} · C${colIndex}`;
  }

  // --- Virtualized grid ---
  function createVirtualGrid(root, { rows, cols, rowHeight = 28, overscan = 8 }) {
    // Header
    const header = document.createElement('div');
    header.className = 'header';
    for (let...