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96 lines
3.3 KiB
JavaScript
96 lines
3.3 KiB
JavaScript
"use strict";
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function collapse_spoiler(spoiler) {
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const spoiler_height = spoiler.height();
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// Set height to rendered height on next frame, then to zero on following
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// frame to allow CSS transition animation to work
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requestAnimationFrame(() => {
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spoiler.height(spoiler_height + "px");
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spoiler.removeClass("spoiler-content-open");
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requestAnimationFrame(() => {
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spoiler.height("0px");
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});
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});
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}
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function expand_spoiler(spoiler) {
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// Normally, the height of the spoiler block is not defined absolutely on
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// the `spoiler-content-open` class, but just set to `auto` (i.e. the height
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// of the content). CSS animations do not work with properties set to
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// `auto`, so we get the actual height of the content here and temporarily
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// put it explicitly on the element styling to allow the transition to work.
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const spoiler_height = spoiler.prop("scrollHeight");
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spoiler.height(spoiler_height + "px");
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// The `spoiler-content-open` class has CSS animations defined on it which
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// will trigger on the frame after this class change.
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spoiler.addClass("spoiler-content-open");
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spoiler.on("transitionend", () => {
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spoiler.off("transitionend");
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// When the CSS transition is over, reset the height to auto
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// This keeps things working if, e.g., the viewport is resized
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spoiler.height("");
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});
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}
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exports.hide_spoilers_in_notification = (content) => {
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content.find(".spoiler-block").each((i, elem) => {
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$(elem).find(".spoiler-content").remove();
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let text = $(elem).find(".spoiler-header").text().trim();
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if (text.length > 0) {
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text = `${text} `;
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}
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text = `${text}(…)`;
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$(elem).find(".spoiler-header").text(text);
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});
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return content;
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};
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exports.initialize = function () {
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$("body").on("click", ".spoiler-header", function (e) {
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const button = $(this).children(".spoiler-button");
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const arrow = button.children(".spoiler-arrow");
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const spoiler_content = $(this).siblings(".spoiler-content");
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const target = $(e.target);
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// Spoiler headers can contain Markdown, including links. We
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// return so that clicking such links will be be processed by
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// the browser rather than opening the header.
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if (target.closest("a").length > 0) {
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return;
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}
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// Allow selecting text inside a spoiler header.
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if (document.getSelection().type === "Range") {
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return;
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}
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e.preventDefault();
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e.stopPropagation();
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if (spoiler_content.hasClass("spoiler-content-open")) {
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// Content was open, we are collapsing
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arrow.removeClass("spoiler-button-open");
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// Modify ARIA roles for screen readers
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button.attr("aria-expanded", "false");
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spoiler_content.attr("aria-hidden", "true");
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collapse_spoiler(spoiler_content);
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} else {
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// Content was closed, we are expanding
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arrow.addClass("spoiler-button-open");
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// Modify ARIA roles for screen readers
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button.attr("aria-expanded", "true");
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spoiler_content.attr("aria-hidden", "false");
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expand_spoiler(spoiler_content);
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}
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});
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};
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window.spoilers = exports;
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