283 lines
13 KiB
JavaScript
283 lines
13 KiB
JavaScript
window.addEventListener("load", (event2) => {
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addKnowls(document);
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});
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function addKnowls(target) {
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const xrefs = target.querySelectorAll("[data-knowl]");
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for (const xref of xrefs) {
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LinkKnowl.initializeXrefKnowl(xref);
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}
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const bornHiddens = target.querySelectorAll(".born-hidden-knowl");
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for (const bhk of bornHiddens) {
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const summary = bhk.querySelector(":scope > summary");
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const contents = bhk.querySelector(":scope > summary + *");
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new SlideRevealer(summary, contents, bhk);
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}
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}
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class SlideRevealer {
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static STATE = Object.freeze({
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INACTIVE: 0,
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CLOSING: 1,
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EXPANDING: 2
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});
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// triggerElement is the element clicked to open/close
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// contentElement is the element that will hide/reveal
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// animatedElement is the element that will grow/shrink as contentElement is modified
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// may be the same as contentElement or a parent of it
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constructor(triggerElement, contentElement, animatedElement) {
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this.triggerElement = triggerElement;
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this.contentElement = contentElement;
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this.animatedElement = animatedElement;
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this.animation = null;
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this.animationState = SlideRevealer.STATE.INACTIVE;
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this.animatedElementInlineStyle = null;
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this.triggerElement.addEventListener("click", (e) => this.onClick(e));
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}
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isBusy() {
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return this.animationState !== SlideRevealer.STATE.INACTIVE || this.animatedElementInlineStyle !== null;
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}
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storeAnimatedElementInlineStyle() {
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if (this.animatedElementInlineStyle !== null) return;
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this.animatedElementInlineStyle = {
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overflow: this.animatedElement.style.overflow,
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height: this.animatedElement.style.height,
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paddingTop: this.animatedElement.style.paddingTop,
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paddingBottom: this.animatedElement.style.paddingBottom
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};
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}
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restoreAnimatedElementInlineStyle() {
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if (this.animatedElementInlineStyle === null) return;
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this.animatedElement.style.overflow = this.animatedElementInlineStyle.overflow;
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this.animatedElement.style.height = this.animatedElementInlineStyle.height;
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this.animatedElement.style.paddingTop = this.animatedElementInlineStyle.paddingTop;
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this.animatedElement.style.paddingBottom = this.animatedElementInlineStyle.paddingBottom;
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this.animatedElementInlineStyle = null;
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}
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onClick(e) {
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if (e) e.preventDefault();
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if (this.isBusy()) return;
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this.storeAnimatedElementInlineStyle();
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this.animatedElement.style.overflow = "hidden";
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if (this.animationState === SlideRevealer.STATE.CLOSING || !this.animatedElement.hasAttribute("open")) {
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this.animatedElement.setAttribute("open", "");
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this.triggerElement.setAttribute("open", "");
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this.contentElement.style.display = "";
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this.contentElement.style.visibility = "hidden";
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let closedHeight = 0;
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if (this.animatedElement.contains(this.triggerElement))
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closedHeight = this.triggerElement.offsetHeight;
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const naturalStyle = window.getComputedStyle(this.animatedElement);
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const naturalPaddingTop = naturalStyle.paddingTop;
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const naturalPaddingBottom = naturalStyle.paddingBottom;
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this.animatedElement.style.height = `${closedHeight}px`;
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this.animatedElement.style.paddingTop = "0px";
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this.animatedElement.style.paddingBottom = "0px";
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const expandingMeasurements = {
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fullHeight: this.contentElement === this.animatedElement ? this.contentElement.scrollHeight : closedHeight + this.contentElement.offsetHeight,
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paddingTop: naturalPaddingTop,
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paddingBottom: naturalPaddingBottom
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};
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this.contentElement.style.visibility = "";
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this.toggle(true, expandingMeasurements);
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} else if (this.animationState === SlideRevealer.STATE.EXPANDING || this.animatedElement.hasAttribute("open")) {
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this.toggle(false);
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}
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}
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toggle(expanding, expandingMeasurements = null) {
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let closedHeight = 0;
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if (this.animatedElement.contains(this.triggerElement))
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closedHeight = this.triggerElement.offsetHeight;
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const computedStyle = window.getComputedStyle(this.animatedElement);
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const fullHeight = expandingMeasurements?.fullHeight ?? closedHeight + this.contentElement.offsetHeight;
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const startHeight = `${expanding ? closedHeight : this.animatedElement.offsetHeight}px`;
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const endHeight = `${expanding ? fullHeight : closedHeight}px`;
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const currentPaddingTop = computedStyle.paddingTop;
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const currentPaddingBottom = computedStyle.paddingBottom;
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const endPaddingTop = expandingMeasurements?.paddingTop ?? currentPaddingTop;
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const endPaddingBottom = expandingMeasurements?.paddingBottom ?? currentPaddingBottom;
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const startPadTop = expanding ? "0px" : currentPaddingTop;
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const endPadTop = expanding ? endPaddingTop : "0px";
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const startPadBottom = expanding ? "0px" : currentPaddingBottom;
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const endPadBottom = expanding ? endPaddingBottom : "0px";
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if (this.animation) {
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this.animation.cancel();
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}
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const animDuration = Math.max(Math.min(Math.abs(closedHeight - fullHeight) / 400 * 1e3, 750), 250);
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this.animationState = expanding ? SlideRevealer.STATE.EXPANDING : SlideRevealer.STATE.CLOSING;
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this.animation = this.animatedElement.animate({
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height: [startHeight, endHeight],
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paddingTop: [startPadTop, endPadTop],
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paddingBottom: [startPadBottom, endPadBottom]
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}, {
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duration: animDuration,
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easing: "ease-out"
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});
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this.animation.onfinish = () => {
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this.onAnimationFinish(expanding);
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};
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this.animation.oncancel = () => {
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this.animationState = SlideRevealer.STATE.INACTIVE;
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this.restoreAnimatedElementInlineStyle();
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};
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}
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onAnimationFinish(isOpen) {
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this.animation = null;
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this.animationState = SlideRevealer.STATE.INACTIVE;
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if (!isOpen) {
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this.animatedElement.removeAttribute("open");
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this.triggerElement.removeAttribute("open");
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}
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this.restoreAnimatedElementInlineStyle();
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if (!isOpen)
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this.contentElement.style.display = "none";
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this.contentElement.style.visibility = "";
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if (isOpen) {
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let hasCallback = this.contentElement.querySelectorAll("[data-knowl-callback]");
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hasCallback.forEach((el) => {
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window[el.getAttribute("data-knowl-callback")](el, open);
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});
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}
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}
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}
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class LinkKnowl {
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// Used to uniquely identify XrefKnowls
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static xrefCount = 0;
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// Factory to create an XrefKnowl from a knowl link
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// Will avoid duplicate initialization
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// This should be used by outside code to create XrefKnowls
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static initializeXrefKnowl(knowlLinkElement) {
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if (knowlLinkElement.getAttribute("data-knowl-uid") === null) {
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return new LinkKnowl(knowlLinkElement);
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}
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}
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// "Private" constructor - should only be called by initializeXrefKnowl
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constructor(knowlLinkElement) {
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this.linkElement = knowlLinkElement;
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this.outputElement = null;
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this.slideHandler = null;
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this.uid = LinkKnowl.xrefCount++;
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knowlLinkElement.setAttribute("data-knowl-uid", this.uid);
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knowlLinkElement.setAttribute("role", "button");
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knowlLinkElement.setAttribute("data-base-title", knowlLinkElement.getAttribute("title") || this.linkElement.textContent);
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knowlLinkElement.classList.add("knowl__link");
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this.updateLabels(false);
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knowlLinkElement.addEventListener("click", this.handleLinkClick.bind(this));
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}
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// Set aria-label and title based on visibility of knowl
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updateLabels(isVisible) {
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const verb = isVisible ? this.linkElement.getAttribute("data-close-label") || "Close" : this.linkElement.getAttribute("data-reveal-label") || "Reveal";
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const targetDescript = this.linkElement.getAttribute("data-base-title");
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const helpText = verb + " " + targetDescript;
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this.linkElement.setAttribute("aria-label", helpText);
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this.linkElement.setAttribute("title", helpText);
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}
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// Toggle the state of the knowl link and output elements
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// Assumes output is already created
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toggle() {
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this.linkElement.classList.toggle("active");
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const isActive = this.linkElement.classList.contains("active");
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this.updateLabels(isActive);
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if (isActive) {
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const h = this.outputElement.getBoundingClientRect().height;
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if (h > window.innerHeight) {
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this.outputElement.scrollIntoView(true);
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} else {
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if (this.outputElement.getBoundingClientRect().bottom > window.innerHeight)
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this.outputElement.scrollIntoView(false);
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}
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}
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}
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// Returns element the knowl output should be inserted after
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findOutputLocation() {
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const invalidParents = "table, mjx-container, div.tabular-box, .runestone > .parsons";
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let el = this.linkElement.parentElement;
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let problemAncestor = el.closest(invalidParents);
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while (problemAncestor && problemAncestor !== el) {
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el = problemAncestor;
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problemAncestor = el.closest(invalidParents);
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}
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return el;
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}
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// Create the knowl output element
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createOutputElement() {
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const outputId = "knowl-uid-" + this.uid;
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const outputContentsId = "knowl-output-" + this.uid;
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const linkTarget = this.linkElement.getAttribute("data-knowl");
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const placeholderText = `<div class='knowl__content' style='display:none;' id='${outputId}' aria-live='polite' id='${outputContentsId}'>Loading '${linkTarget}'</div>`;
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const temp = document.createElement("template");
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temp.innerHTML = placeholderText;
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this.outputElement = temp.content.children[0];
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const insertLoc = this.findOutputLocation(this.linkElement);
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insertLoc.after(this.outputElement);
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}
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// Get content for knowl as dom element. Returns promise that resolves to knowl content
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async getContent() {
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const contentURL = this.linkElement.getAttribute("data-knowl");
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const knowlContent = await fetch(contentURL).then((response) => response.text()).then((data) => {
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let knowlDoc = new DOMParser().parseFromString(data, "text/html");
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let tempContainer2 = knowlDoc.body;
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let scripts = knowlDoc.querySelectorAll("head script");
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tempContainer2.append(...scripts);
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return tempContainer2;
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}).catch((error) => {
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const destination = this.linkElement.getAttribute("href");
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const text = this.linkElement.textContent;
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const err_message = `<div class='knowl-output__error'><div class='para'>Error fetching content. (<em>${error}</em>)</div><div class='para'><a href='${destination}'>Navigate to ${text}</a> instead.</div><div class='para'>If you are viewing this book from your local filesystem, this is expected behavior. To view the book with all features, you must serve the book from a web server. See the <a href="https://pretextbook.org/doc/guide/html/author-faq.html#how-do-i-view-my-book-locally">PreTeXt FAQ</a> for more information.</div></div>`;
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return err_message;
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});
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return knowlContent;
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}
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// Handle a click on the knowl link
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handleLinkClick(event) {
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event.preventDefault();
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if (this.slideHandler?.isBusy()) {
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return;
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}
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if (this.outputElement !== null) {
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this.toggle();
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} else {
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this.createOutputElement();
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this.slideHandler = new SlideRevealer(this.linkElement, this.outputElement, this.outputElement);
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this.linkElement.addEventListener("click", this.slideHandler);
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let loadingTimeout = setTimeout(() => {
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loadingTimeout = null;
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this.slideHandler.onClick();
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this.toggle();
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}, 500);
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const content = this.getContent();
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content.then((tempContainer) => {
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if (loadingTimeout !== null) {
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clearTimeout(loadingTimeout);
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}
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setTimeout(() => {
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this.slideHandler.onClick();
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this.toggle();
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}, 100);
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const runestoneElements = tempContainer.querySelectorAll(".ptx-runestone-container");
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[...runestoneElements].forEach((e) => {
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const rsId = e.querySelector("[data-component]")?.id;
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const onPage = document.getElementById(rsId);
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if (onPage) {
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e.innerHTML = `<div class="para">The interactive that belongs here is already on the page and cannot appear multiple times. <a href="#${rsId}">Scroll to interactive.</a>`;
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} else {
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window.runestoneComponents.renderOneComponent(e);
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}
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});
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const children = [...tempContainer.children];
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this.outputElement.innerHTML = "";
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this.outputElement.append(...children);
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addKnowls(this.outputElement);
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MathJax.typesetPromise([this.outputElement]);
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Prism.highlightAllUnder(this.outputElement);
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[...this.outputElement.getElementsByTagName("script")].forEach((s) => {
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if (s.getAttribute("type") === null || s.getAttribute("type") === "text/javascript") {
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eval(s.innerHTML);
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}
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});
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}).catch((data) => {
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console.log("Error fetching knowl content: " + data);
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});
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}
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}
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}
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//# sourceMappingURL=knowl.js.map
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