43 lines
1.0 KiB
JavaScript
43 lines
1.0 KiB
JavaScript
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/**
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* This module is used to implement persistent navbar expansion.
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*/
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// The variable to store the expansion information.
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let expanded = {};
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// Load expansion information from sessionStorage.
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for (const e of (sessionStorage.getItem("expanded") || "").split(",")) {
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if (e !== "") {
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expanded[e] = true;
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}
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}
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/**
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* Save expansion information to sessionStorage.
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*/
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function saveExpanded() {
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sessionStorage.setItem(
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"expanded",
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Object.getOwnPropertyNames(expanded)
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.filter((e) => expanded[e])
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.join(",")
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);
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}
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// save expansion information when user change the expansion.
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for (const elem of document.getElementsByClassName("nav_sect")) {
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const id = elem.getAttribute("data-path");
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if (!id) continue;
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if (expanded[id]) {
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elem.open = true;
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}
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elem.addEventListener("toggle", () => {
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expanded[id] = elem.open;
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saveExpanded();
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});
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}
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// Scroll to center.
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for (const currentFileLink of document.getElementsByClassName("visible")) {
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currentFileLink.scrollIntoView({ block: "center" });
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}
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