debian-mirror-gitlab/spec/javascripts/helpers/scroll_into_view_promise.js
2019-02-15 15:39:39 +05:30

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();
});
}