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Scroll an element to ensure it is visible in a scrollable container

Written byPhuoc Nguyen
03 May, 2020
Level 2 — Intermediate
The following functions scrolls the `ele` element if it's not visible in its scrollable container:
const scrollToBeVisible = function (ele, container) {
const eleTop = ele.offsetTop;
const eleBottom = eleTop + ele.clientHeight;

const containerTop = container.scrollTop;
const containerBottom = containerTop + container.clientHeight;

if (eleTop < containerTop) {
// Scroll to the top of container
container.scrollTop -= containerTop - eleTop;
} else if (eleBottom > containerBottom) {
// Scroll to the bottom of container
container.scrollTop += eleBottom - containerBottom;

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