debian-mirror-gitlab/app/assets/javascripts/lib/utils/navigation_utility.js

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import { visitUrl } from './url_utility';
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/**
* Helper function that finds the href of the fiven selector and updates the location.
*
* @param {String} selector
*/
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export default function findAndFollowLink(selector) {
const element = document.querySelector(selector);
const link = element && element.getAttribute('href');
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if (link) {
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visitUrl(link);
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}
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}
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export function prefetchDocument(url) {
const newPrefetchLink = document.createElement('link');
newPrefetchLink.rel = 'prefetch';
newPrefetchLink.href = url;
newPrefetchLink.setAttribute('as', 'document');
document.head.appendChild(newPrefetchLink);
}
export function initPrefetchLinks(selector) {
document.querySelectorAll(selector).forEach((el) => {
let mouseOverTimer;
const mouseOutHandler = () => {
if (mouseOverTimer) {
clearTimeout(mouseOverTimer);
mouseOverTimer = undefined;
}
};
const mouseOverHandler = () => {
el.addEventListener('mouseout', mouseOutHandler, { once: true, passive: true });
mouseOverTimer = setTimeout(() => {
if (el.href) prefetchDocument(el.href);
// Only execute once
el.removeEventListener('mouseover', mouseOverHandler, true);
mouseOverTimer = undefined;
}, 100);
};
el.addEventListener('mouseover', mouseOverHandler, {
capture: true,
passive: true,
});
});
}