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Small refactors in anchors.js (#29947) (#30003) 

Backport #29947 by @silverwind

Some 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`.

Co-authored-by: silverwind <me@silverwind.io>
This commit is contained in:
Giteabot 2024-03-22 22:02:05 +08:00 committed by GitHub
parent 24c66c5096
commit 688107651c
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1 changed files with 21 additions and 19 deletions
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40
web_src/js/markup/anchors.js
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@ -1,29 +1,30 @@
import {svg} from '../svg.js';
const addPrefix = (str) => `user-content-${str}`;
const removePrefix = (str) => str.replace(/^user-content-/, '');
const hasPrefix = (str) => str.startsWith('user-content-');
// scroll to anchor while respecting the `user-content` prefix that exists on the target
function scrollToAnchor(encodedId, initial) {
// abort if the browser has already scrolled to another anchor during page load
if (!encodedId || (initial && document.querySelector(':target'))) return;
function scrollToAnchor(encodedId) {
if (!encodedId) return;
const id = decodeURIComponent(encodedId);
let el = document.getElementById(`user-content-${id}`);
const prefixedId = addPrefix(id);
let el = document.getElementById(prefixedId);
// check for matching user-generated `a[name]`
if (!el) {
const nameAnchors = document.getElementsByName(`user-content-${id}`);
const nameAnchors = document.getElementsByName(prefixedId);
if (nameAnchors.length) {
el = nameAnchors[0];
}
}
// compat for links with old 'user-content-' prefixed hashes
if (!el && id.startsWith('user-content-')) {
const el = document.getElementById(id);
if (el) el.scrollIntoView();
if (!el && hasPrefix(id)) {
return document.getElementById(id)?.scrollIntoView();
}
if (el) {
el.scrollIntoView();
}
el?.scrollIntoView();
}
export function initMarkupAnchors() {
@ -32,11 +33,10 @@ export function initMarkupAnchors() {
for (const markupEl of markupEls) {
// create link icons for markup headings, the resulting link href will remove `user-content-`
for (const heading of markupEl.querySelectorAll(`:is(h1, h2, h3, h4, h5, h6`)) {
const originalId = heading.id.replace(/^user-content-/, '');
for (const heading of markupEl.querySelectorAll('h1, h2, h3, h4, h5, h6')) {
const a = document.createElement('a');
a.classList.add('anchor');
a.setAttribute('href', `#${encodeURIComponent(originalId)}`);
a.setAttribute('href', `#${encodeURIComponent(removePrefix(heading.id))}`);
a.innerHTML = svg('octicon-link');
heading.prepend(a);
}
@ -45,8 +45,7 @@ export function initMarkupAnchors() {
for (const a of markupEl.querySelectorAll('a[href^="#"]')) {
const href = a.getAttribute('href');
if (!href.startsWith('#user-content-')) continue;
const originalId = href.replace(/^#user-content-/, '');
a.setAttribute('href', `#${originalId}`);
a.setAttribute('href', `#${removePrefix(href.substring(1))}`);
}
// add `user-content-` prefix to user-generated `a[name]` link targets
@ -54,15 +53,18 @@ export function initMarkupAnchors() {
for (const a of markupEl.querySelectorAll('a[name]')) {
const name = a.getAttribute('name');
if (!name) continue;
a.setAttribute('name', `user-content-${a.name}`);
a.setAttribute('name', addPrefix(a.name));
}
for (const a of markupEl.querySelectorAll('a[href^="#"]')) {
a.addEventListener('click', (e) => {
scrollToAnchor(e.currentTarget.getAttribute('href')?.substring(1), false);
scrollToAnchor(e.currentTarget.getAttribute('href')?.substring(1));
});
}
}
scrollToAnchor(window.location.hash.substring(1), true);
// scroll to anchor unless the browser has already scrolled somewhere during page load
if (!document.querySelector(':target')) {
scrollToAnchor(window.location.hash?.substring(1));
}
}