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Use a map to match ids to navigation elements

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This commit is contained in:
Zoroark 2022-01-20 20:54:46 +01:00
parent 19b26cbe5a
commit 3db65ee659
1 changed files with 17 additions and 11 deletions
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26
assets/ts/scrollspy.ts
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@ -1,6 +1,6 @@
// Implements a scroll spy system for the ToC, displaying the current section with an indicator and scrolling to it when needed. // Implements a scroll spy system for the ToC, displaying the current section with an indicator and scrolling to it when needed.
// Inspired from https://gomakethings.com/debouncing-your-javascript-events/ could work // Inspired from https://gomakethings.com/debouncing-your-javascript-events/
function debounced(func: Function) { function debounced(func: Function) {
let timeout; let timeout;
return () => { return () => {
@ -26,15 +26,19 @@ function scrollToTocElement(tocElement: HTMLElement, scrollableNavigation: HTMLE
scrollableNavigation.scrollTo({ top: scrollTop, behavior: "smooth" }); scrollableNavigation.scrollTo({ top: scrollTop, behavior: "smooth" });
} }
function findLinkForSectionId(sectionId: string, navigation: NodeListOf<Element>): HTMLElement | undefined { type IdToElementMap = { [key: string]: HTMLElement };
for (let i = 0; i < navigation.length; i++) {
let link = navigation[i].querySelector("a");
if (link.getAttribute("href") === "#" + sectionId) {
return navigation[i] as HTMLElement;
}
}
return undefined; function buildIdToNavigationElementMap(navigation: NodeListOf<Element>): IdToElementMap {
const sectionLinkRef: IdToElementMap = {};
navigation.forEach((navigationElement: HTMLElement) => {
const link = navigationElement.querySelector("a");
const href = link.getAttribute("href");
if (href.startsWith("#")) {
sectionLinkRef[href.slice(1)] = navigationElement;
}
});
return sectionLinkRef;
} }
function computeOffsets(headers: NodeListOf<Element>) { function computeOffsets(headers: NodeListOf<Element>) {
@ -73,6 +77,8 @@ function setupScrollspy() {
let activeSectionLink: Element; let activeSectionLink: Element;
let idToNavigationElement: IdToElementMap = buildIdToNavigationElementMap(navigation);
function scrollHandler() { function scrollHandler() {
let scrollPosition = document.documentElement.scrollTop || document.body.scrollTop; let scrollPosition = document.documentElement.scrollTop || document.body.scrollTop;
@ -91,7 +97,7 @@ function setupScrollspy() {
// - No active section but the link does not exist in toc (e.g. because it is outside of the applicable ToC levels) => undefined // - No active section but the link does not exist in toc (e.g. because it is outside of the applicable ToC levels) => undefined
let newActiveSectionLink: HTMLElement | undefined let newActiveSectionLink: HTMLElement | undefined
if (newActiveSection) { if (newActiveSection) {
newActiveSectionLink = findLinkForSectionId(newActiveSection.id, navigation); newActiveSectionLink = idToNavigationElement[newActiveSection.id];
} }
if (newActiveSection && !newActiveSectionLink) { if (newActiveSection && !newActiveSectionLink) {