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