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@ -1,16 +1,32 @@
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/*
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Account for id attributes that are in the sidebar nav
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*/
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function populateIds() {
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/*
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Copyright 2020, 2021 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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Account for id attributes that are in the sidebar nav
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*/
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function populateIds() {
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const navItems = document.querySelectorAll(".td-sidebar-nav li");
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return Array.from(navItems).map(item => item.id).filter(id => id != "");
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}
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}
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/*
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Given an ID and an array of IDs, return s version of the original ID that's
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not equal to any of the IDs in the array.
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*/
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function uniquifyHeadingId(id, uniqueIDs) {
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/*
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Given an ID and an array of IDs, return s version of the original ID that's
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not equal to any of the IDs in the array.
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*/
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function uniquifyHeadingId(id, uniqueIDs) {
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const baseId = id;
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let counter = 0;
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while (uniqueIDs.includes(id)) {
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@ -18,41 +34,41 @@
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id = baseId + "-" + counter.toString();
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}
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return id;
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}
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}
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/*
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Given an array of heading nodes, ensure they all have unique IDs.
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/*
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Given an array of heading nodes, ensure they all have unique IDs.
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We have to do this mostly because of client-server modules, which are
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rendered separately then glued together with a template.
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Because heading IDs are generated in rendering, this means they can and will
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end up with duplicate IDs.
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*/
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function uniquifyHeadingIds(headings) {
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We have to do this mostly because of client-server modules, which are
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rendered separately then glued together with a template.
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Because heading IDs are generated in rendering, this means they can and will
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end up with duplicate IDs.
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*/
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function uniquifyHeadingIds(headings) {
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const uniqueIDs = populateIds();
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for (let heading of headings) {
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const uniqueID = uniquifyHeadingId(heading.id, uniqueIDs);
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uniqueIDs.push(uniqueID);
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heading.id = uniqueID;
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}
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}
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}
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/*
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The document contains "normal" headings, and these have corresponding items
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in the ToC.
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The document might also contain H1 headings that act as titles for blocks of
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rendered data, like HTTP APIs or event schemas. Unlike "normal" headings,
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these headings don't appear in the ToC. But they do have anchor IDs to enable
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links to them. When someone follows a link to one of these "rendered data"
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headings we want to scroll the ToC to the item corresponding to the "normal"
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heading preceding the "rendered data" heading we have visited.
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To support this we need to add `data` attributes to ToC items.
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These attributes identify which "rendered data" headings live underneath
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the heading corresponding to that ToC item.
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*/
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function setTocItemChildren(toc, headings) {
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/*
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The document contains "normal" headings, and these have corresponding items
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in the ToC.
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The document might also contain H1 headings that act as titles for blocks of
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rendered data, like HTTP APIs or event schemas. Unlike "normal" headings,
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these headings don't appear in the ToC. But they do have anchor IDs to enable
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links to them. When someone follows a link to one of these "rendered data"
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headings we want to scroll the ToC to the item corresponding to the "normal"
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heading preceding the "rendered data" heading we have visited.
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To support this we need to add `data` attributes to ToC items.
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These attributes identify which "rendered data" headings live underneath
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the heading corresponding to that ToC item.
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*/
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function setTocItemChildren(toc, headings) {
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let tocEntryForHeading = null;
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for (const heading of headings) {
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// H1 headings are rendered-data headings
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@ -64,12 +80,12 @@
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tocEntryForHeading.setAttribute(`data-${heading.id}`, "true");
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}
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}
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}
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}
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/*
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Generate a table of contents based on the headings in the document.
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*/
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function makeToc() {
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/*
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Generate a table of contents based on the headings in the document.
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*/
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function makeToc() {
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// make the title from the H1
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const h1 = document.body.querySelector("h1");
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@ -102,30 +118,29 @@
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// tell ToC items about any rendered-data headings they contain
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setTocItemChildren(section.content, headings);
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}
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}
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// create a single ToC entry
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function makeTocEntry(heading) {
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// create a single ToC entry
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function makeTocEntry(heading) {
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const li = document.createElement("li");
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const a = document.createElement("a");
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a.setAttribute("href", `#${heading.id}`);
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a.textContent = heading.textContent;
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li.appendChild(a);
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return li;
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}
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/*
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Each ToC section is an `<ol>` element.
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ToC entries are `<li>` elements and these contain nested ToC sections,
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whenever we go to the next heading level down.
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*/
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function makeTocSection(headings, index) {
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}
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/*
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Each ToC section is an `<ol>` element.
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ToC entries are `<li>` elements and these contain nested ToC sections,
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whenever we go to the next heading level down.
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*/
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function makeTocSection(headings, index) {
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const ol = document.createElement("ol");
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let previousHeading = null;
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let previousLi = null;
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let i = index;
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const lis = [];
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for (i; i < headings.length; i++) {
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const thisHeading = headings[i];
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if (previousHeading && (thisHeading.tagName > previousHeading.tagName)) {
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@ -158,21 +173,20 @@
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content: ol,
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index: i
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}
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}
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}
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/*
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Set a new ToC entry.
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Clear any previously highlighted ToC items, set the new one,
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and adjust the ToC scroll position.
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*/
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function setTocEntry(newEntry) {
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/*
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Set a new ToC entry.
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Clear any previously highlighted ToC items, set the new one,
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and adjust the ToC scroll position.
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*/
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function setTocEntry(newEntry) {
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const activeEntries = document.querySelectorAll("#toc a.active");
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for (const activeEntry of activeEntries) {
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activeEntry.classList.remove('active');
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}
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newEntry.classList.add('active');
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// don't scroll the sidebar nav if the main content is not scrolled
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const nav = document.querySelector("#td-section-nav");
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const content = document.querySelector("html");
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@ -181,29 +195,28 @@
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} else {
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nav.scrollTop = 0;
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}
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}
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}
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/*
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Test whether a node is in the viewport
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*/
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function isInViewport(node) {
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/*
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Test whether a node is in the viewport
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*/
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function isInViewport(node) {
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const rect = node.getBoundingClientRect();
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return (
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rect.top >= 0 &&
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rect.left >= 0 &&
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rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
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rect.right <= (window.innerWidth || document.documentElement.clientWidth)
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);
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}
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}
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/*
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The callback we pass to the IntersectionObserver constructor.
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/*
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The callback we pass to the IntersectionObserver constructor.
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Called when any of our observed nodes starts or stops intersecting
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with the viewport.
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*/
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function handleIntersectionUpdate(entries) {
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Called when any of our observed nodes starts or stops intersecting
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with the viewport.
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*/
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function handleIntersectionUpdate(entries) {
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/*
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Special case: If the current URL hash matches a ToC entry, and
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@ -275,13 +288,13 @@
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setTocEntry(newEntry);
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return;
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}
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}
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}
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/*
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Track when headings enter the viewport, and use this to update the highlight
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for the corresponding ToC entry.
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*/
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window.addEventListener('DOMContentLoaded', () => {
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/*
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Track when headings enter the viewport, and use this to update the highlight
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for the corresponding ToC entry.
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*/
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window.addEventListener('DOMContentLoaded', () => {
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makeToc();
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@ -298,4 +311,4 @@
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observer.observe(section);
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});
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});
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});
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