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fix(virtual-core): scroll to index doesn't scroll to bottom correctly (#1029)
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‎.changeset/chilled-falcons-battle.md

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---
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'@tanstack/virtual-core': patch
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---
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fix(virtual-core): scroll to index doesn't scroll to bottom correctly

‎.github/workflows/pr.yml

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uses: nrwl/[email protected]
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with:
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main-branch-name: main
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- name: Install Playwright browsers
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run: pnpm exec playwright install chromium
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- name: Run Checks
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run: pnpm run test:pr
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preview:

‎.gitignore

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vite.config.js.timestamp-*
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vite.config.ts.timestamp-*
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# Playwright test artifacts
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test-results/
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playwright-report/
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*.log

‎knip.json

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{
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"$schema": "https://unpkg.com/knip@5/schema.json",
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"ignoreWorkspaces": ["examples/**"]
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"ignoreWorkspaces": ["examples/**", "packages/react-virtual/e2e/**"]
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}

‎package.json

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"clean": "pnpm --filter \"./packages/**\" run clean",
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"preinstall": "node -e \"if(process.env.CI == 'true') {console.log('Skipping preinstall...'); process.exit(1)}\" || npx -y only-allow pnpm",
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"test": "pnpm run test:ci",
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"test:pr": "nx affected --targets=test:sherif,test:knip,test:eslint,test:lib,test:types,test:build,build",
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"test:ci": "nx run-many --targets=test:sherif,test:knip,test:eslint,test:lib,test:types,test:build,build",
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"test:pr": "nx affected --targets=test:sherif,test:knip,test:eslint,test:lib,test:e2e,test:types,test:build,build",
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"test:ci": "nx run-many --targets=test:sherif,test:knip,test:eslint,test:lib,test:e2e,test:types,test:build,build",
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"test:eslint": "nx affected --target=test:eslint",
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"test:format": "pnpm run prettier --check",
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"test:sherif": "sherif",
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"test:lib": "nx affected --target=test:lib --exclude=examples/**",
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"test:lib:dev": "pnpm run test:lib && nx watch --all -- pnpm run test:lib",
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"test:build": "nx affected --target=test:build --exclude=examples/**",
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"test:types": "nx affected --target=test:types --exclude=examples/**",
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"test:e2e": "nx affected --target=test:e2e --exclude=examples/**",
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"test:knip": "knip",
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"build": "nx affected --target=build --exclude=examples/**",
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"build:all": "nx run-many --target=build --exclude=examples/**",
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},
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"devDependencies": {
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"@changesets/cli": "^2.29.4",
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"@playwright/test": "^1.53.1",
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"@svitejs/changesets-changelog-github-compact": "^1.2.0",
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"@tanstack/config": "^0.18.2",
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"@testing-library/jest-dom": "^6.6.3",

‎packages/react-virtual/e2e/app/index.html

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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="/main.tsx"></script>
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</body>
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</html>

‎packages/react-virtual/e2e/app/main.tsx

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import React from 'react'
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import ReactDOM from 'react-dom/client'
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import { useVirtualizer } from '../../src/index'
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function getRandomInt(min: number, max: number) {
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return Math.floor(Math.random() * (max - min + 1)) + min
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}
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const randomHeight = (() => {
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const cache = new Map()
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return (id: string) => {
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const value = cache.get(id)
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if (value !== undefined) {
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return value
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}
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const v = getRandomInt(25, 100)
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cache.set(id, v)
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return v
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}
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})()
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const App = () => {
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const parentRef = React.useRef<HTMLDivElement>(null)
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const rowVirtualizer = useVirtualizer({
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count: 1002,
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getScrollElement: () => parentRef.current,
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estimateSize: () => 50,
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debug: true,
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})
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return (
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<div>
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<button
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id="scroll-to-1000"
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onClick={() => rowVirtualizer.scrollToIndex(1000)}
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>
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Scroll to 1000
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</button>
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<div
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ref={parentRef}
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id="scroll-container"
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style={{ height: 400, overflow: 'auto' }}
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>
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<div
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style={{
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height: rowVirtualizer.getTotalSize(),
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position: 'relative',
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}}
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>
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{rowVirtualizer.getVirtualItems().map((v) => (
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<div
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key={v.key}
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data-testid={`item-${v.index}`}
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ref={rowVirtualizer.measureElement}
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data-index={v.index}
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style={{
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position: 'absolute',
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top: 0,
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left: 0,
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transform: `translateY(${v.start}px)`,
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width: '100%',
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}}
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>
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<div style={{ height: randomHeight(String(v.key)) }}>
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Row {v.index}
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</div>
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</div>
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))}
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</div>
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</div>
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</div>
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)
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}
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ReactDOM.createRoot(document.getElementById('root')!).render(<App />)

‎packages/react-virtual/e2e/app/test/scroll.spec.ts

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import { expect, test } from '@playwright/test'
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const check = () => {
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const item = document.querySelector('[data-testid="item-1000"]')
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const container = document.querySelector('#scroll-container')
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if (!item || !container) throw new Error('Elements not found')
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const itemRect = item.getBoundingClientRect()
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const containerRect = container.getBoundingClientRect()
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const scrollTop = container.scrollTop
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const top = itemRect.top + scrollTop - containerRect.top
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const botttom = top + itemRect.height
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const containerBottom = scrollTop + container.clientHeight
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return Math.abs(botttom - containerBottom)
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}
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test('scrolls to index 1000', async ({ page }) => {
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await page.goto('/')
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await page.click('#scroll-to-1000')
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// Wait for scroll effect (including retries)
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await page.waitForTimeout(1000)
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await expect(page.locator('[data-testid="item-1000"]')).toBeVisible()
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const delta = await page.evaluate(check)
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console.log('bootom element detla', delta)
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expect(delta).toBeLessThan(1.01)
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})

‎packages/react-virtual/e2e/app/tsconfig.json

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{
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"compilerOptions": {
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"strict": true,
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"esModuleInterop": true,
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"jsx": "react-jsx",
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"target": "ESNext",
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"moduleResolution": "Bundler",
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"module": "ESNext",
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"resolveJsonModule": true,
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"allowJs": true,
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"skipLibCheck": true
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},
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"exclude": ["node_modules", "dist"]
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}

‎packages/react-virtual/e2e/app/vite.config.ts

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import { defineConfig } from 'vite'
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import react from '@vitejs/plugin-react'
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export default defineConfig({
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root: __dirname,
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plugins: [react()],
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})

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