Algoritmlar (animatsiya)Brauzeringizda ishlaydiTekshirilgan sana: 1-oktabr, 2026

List Virtualization (Windowing) animatsiyasi

List Virtualization (Windowing) animatsiyasi. Front-end uchun animatsiyali algoritmlar: saralash, qidirish, debounce va throttle, event loop, virtual DOM, kesh, trie va yoʻl topish. Brauzeringizda tez, maxfiy va oson ishlaydi.

Mahalliystandart holatda maxfiyTezroʻyxatdan oʻtish shart emas

Quyidagi tool tugmalari va matnlari hozircha ingliz tilida.

Browser and DOMTime: O(visible rows)Space: O(visible rows)

Rows that fit on screenExtra rows rendered above and below

30 items

Scroll position

scrollTop = 0px

Items in the DOM

6 of 30

Rendered range

1 to 6

Step 1 / 15

A long list can have thousands of rows. Virtualization renders only the rows in view (green) plus a few extra (blue); the rest (grey) are not in the DOM at all.

checking
found / in view
ruled out

JavaScript

1function getVisibleRange(scrollTop, viewportHeight, itemHeight, total, overscan = 2) {
2  const first = Math.floor(scrollTop / itemHeight);
3  const last = Math.ceil((scrollTop + viewportHeight) / itemHeight);
4  const start = Math.max(0, first - overscan);
5  const end = Math.min(total, last + overscan);
6  return [start, end];
7}

Tip: use the arrow keys to step and the space bar to play or pause.

Loading animation...