34 lines
1.6 KiB
TypeScript
34 lines
1.6 KiB
TypeScript
// Implements smooth scrolling when clicking on an anchor link.
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// This is required instead of using modern CSS because Chromium does not currently support scrolling
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// one element with scrollTo while another element is scrolled because of a click on a link. This would
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// thus not work with the ToC scrollspy and e.g. footnotes.
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// Here are additional links about this issue:
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// - https://stackoverflow.com/questions/49318497/google-chrome-simultaneously-smooth-scrollintoview-with-more-elements-doesn
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// - https://stackoverflow.com/questions/57214373/scrollintoview-using-smooth-function-on-multiple-elements-in-chrome
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// - https://bugs.chromium.org/p/chromium/issues/detail?id=833617
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// - https://bugs.chromium.org/p/chromium/issues/detail?id=1043933
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// - https://bugs.chromium.org/p/chromium/issues/detail?id=1121151
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const anchorLinksQuery = "a[href]";
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function setupSmoothAnchors() {
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document.querySelectorAll(anchorLinksQuery).forEach(aElement => {
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let href = aElement.getAttribute("href");
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if (!href.startsWith("#")) {
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return;
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}
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aElement.addEventListener("click", clickEvent => {
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clickEvent.preventDefault();
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let targetId = aElement.getAttribute("href").substring(1);
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// The replace done on ':' is here for footnotes, as this character would otherwise interfere when used as a CSS selector.
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let target = document.getElementById(targetId.replace(":", "\\:")) as HTMLElement;
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window.history.pushState({}, "", aElement.getAttribute("href"));
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scrollTo({ top: target.offsetTop, behavior: "smooth" });
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});
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});
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}
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export { setupSmoothAnchors }; |