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gitea/web_src/js/markup/anchors.js

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import {svg} from '../svg.js';
const headingSelector = '.markup h1, .markup h2, .markup h3, .markup h4, .markup h5, .markup h6';
function scrollToAnchor(hash, initial) {
// abort if the browser has already scrolled to another anchor during page load
if (initial && document.querySelector(':target')) return;
if (hash?.length <= 1) return;
const id = decodeURIComponent(hash.substring(1));
const el = document.getElementById(`user-content-${id}`);
if (el) {
el.scrollIntoView();
} else if (id.startsWith('user-content-')) { // compat for links with old 'user-content-' prefixed hashes
const el = document.getElementById(id);
if (el) el.scrollIntoView();
}
}
export function initMarkupAnchors() {
if (!document.querySelector('.markup')) return;
for (const heading of document.querySelectorAll(headingSelector)) {
const originalId = heading.id.replace(/^user-content-/, '');
const a = document.createElement('a');
a.classList.add('anchor');
a.setAttribute('href', `#${encodeURIComponent(originalId)}`);
a.innerHTML = svg('octicon-link');
a.addEventListener('click', (e) => {
scrollToAnchor(e.currentTarget.getAttribute('href'), false);
});
heading.prepend(a);
}
scrollToAnchor(window.location.hash, true);
}