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forgejo/web_src/js/markdown/anchors.js

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import {svg} from '../utils.js';
const headingSelector = '.markdown h1, .markdown h2, .markdown h3, .markdown h4, .markdown h5, .markdown h6';
function scrollToAnchor() {
if (document.querySelector(':target')) return;
if (!window.location.hash || window.location.hash.length <= 1) return;
const id = window.location.hash.substring(1);
const el = document.getElementById(`user-content-${id}`);
if (el) {
el.scrollIntoView();
} else if (id.startsWith('user-content-')) { // compat for links with old 'user-content-' prefixed hashes
const el = document.getElementById(id);
if (el) el.scrollIntoView();
}
}
export default function initMarkdownAnchors() {
if (!document.querySelector('.markdown')) return;
for (const heading of document.querySelectorAll(headingSelector)) {
const originalId = heading.id.replace(/^user-content-/, '');
const a = document.createElement('a');
a.classList.add('anchor');
a.setAttribute('href', `#${encodeURIComponent(originalId)}`);
a.innerHTML = svg('octicon-link', 16);
heading.prepend(a);
}
scrollToAnchor();
window.addEventListener('hashchange', scrollToAnchor);
}