Algoritmler (animasiýa)Brauzeriňizde işleýärBarlanan sene: 1 oktýabr 2026

List Virtualization (Windowing): animasiýa

List Virtualization (Windowing): animasiýa. Frontend üçin animasiýaly algoritmler: tertipleme, gözleg, debounce we throttle, event loop, wirtual DOM, keş, trie we ýol gözlegi. Brauzeriňizde çalt, gizlin we ýönekeý.

Ýerliadaty ýagdaýda gizlinÇaltagza bolmak gerek däl

Aşakdaky guralyň düwmeleri we tekstleri heniz iňlis dilinde.

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.

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