gitlab-org--gitlab-foss/spec/frontend/helpers/scroll_into_view_promise.js
Winnie Hellmann 2e7486681a Copy missing helpers from Karma to Jest
Copy missing helpers from Karma to Jest
2019-03-28 20:07:40 +01:00

28 lines
852 B
JavaScript

export default function scrollIntoViewPromise(intersectionTarget, timeout = 100, maxTries = 5) {
return new Promise((resolve, reject) => {
let intersectionObserver;
let retry = 0;
const intervalId = setInterval(() => {
if (retry >= maxTries) {
intersectionObserver.disconnect();
clearInterval(intervalId);
reject(new Error(`Could not scroll target into viewPort within ${timeout * maxTries} ms`));
}
retry += 1;
intersectionTarget.scrollIntoView();
}, timeout);
intersectionObserver = new IntersectionObserver(entries => {
if (entries[0].isIntersecting) {
intersectionObserver.disconnect();
clearInterval(intervalId);
resolve();
}
});
intersectionObserver.observe(intersectionTarget);
intersectionTarget.scrollIntoView();
});
}