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c97a7b8347Some minor refactors, remove unnecessary `:is` selector and move the `:target` check out of the function. Might as well backport for the rare browser that does not support `:is`. (cherry picked from commit 29118743a58cf3172bddb6a4fa287484c62b4eb1)
70 lines
2.4 KiB
JavaScript
70 lines
2.4 KiB
JavaScript
import {svg} from '../svg.js';
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const addPrefix = (str) => `user-content-${str}`;
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const removePrefix = (str) => str.replace(/^user-content-/, '');
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const hasPrefix = (str) => str.startsWith('user-content-');
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// scroll to anchor while respecting the `user-content` prefix that exists on the target
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function scrollToAnchor(encodedId) {
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if (!encodedId) return;
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const id = decodeURIComponent(encodedId);
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const prefixedId = addPrefix(id);
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let el = document.getElementById(prefixedId);
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// check for matching user-generated `a[name]`
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if (!el) {
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const nameAnchors = document.getElementsByName(prefixedId);
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if (nameAnchors.length) {
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el = nameAnchors[0];
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}
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}
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// compat for links with old 'user-content-' prefixed hashes
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if (!el && hasPrefix(id)) {
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return document.getElementById(id)?.scrollIntoView();
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}
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el?.scrollIntoView();
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}
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export function initMarkupAnchors() {
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const markupEls = document.querySelectorAll('.markup');
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if (!markupEls.length) return;
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for (const markupEl of markupEls) {
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// create link icons for markup headings, the resulting link href will remove `user-content-`
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for (const heading of markupEl.querySelectorAll('h1, h2, h3, h4, h5, h6')) {
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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(removePrefix(heading.id))}`);
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a.innerHTML = svg('octicon-link');
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heading.prepend(a);
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}
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// remove `user-content-` prefix from links so they don't show in url bar when clicked
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for (const a of markupEl.querySelectorAll('a[href^="#"]')) {
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const href = a.getAttribute('href');
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if (!href.startsWith('#user-content-')) continue;
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a.setAttribute('href', `#${removePrefix(href.substring(1))}`);
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}
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// add `user-content-` prefix to user-generated `a[name]` link targets
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// TODO: this prefix should be added in backend instead
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for (const a of markupEl.querySelectorAll('a[name]')) {
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const name = a.getAttribute('name');
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if (!name) continue;
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a.setAttribute('name', addPrefix(a.name));
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}
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for (const a of markupEl.querySelectorAll('a[href^="#"]')) {
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a.addEventListener('click', (e) => {
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scrollToAnchor(e.currentTarget.getAttribute('href')?.substring(1));
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});
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}
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}
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// scroll to anchor unless the browser has already scrolled somewhere during page load
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if (!document.querySelector(':target')) {
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scrollToAnchor(window.location.hash?.substring(1));
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}
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}
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