| /* |
| * Copyright 2018 Google LLC |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| https://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| (function ($) { |
| 'use strict'; |
| |
| // Headers' anchor link that shows on hover |
| $(function () { |
| // append anchor links to headings in markdown. |
| var article = document.getElementsByTagName('main')[0]; |
| if (!article) { |
| return; |
| } |
| var headings = article.querySelectorAll('h1, h2, h3, h4, h5, h6'); |
| headings.forEach(function (heading) { |
| if (heading.id) { |
| var a = document.createElement('a'); |
| // set visibility: hidden, not display: none to avoid layout change |
| a.style.visibility = 'hidden'; |
| // [a11y] hide this from screen readers, etc.. |
| a.setAttribute('aria-hidden', 'true'); |
| // material insert_link icon in svg format |
| a.innerHTML = ' <svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" width="24" height="24" viewBox="0 0 24 24"><path d="M0 0h24v24H0z" fill="none"/><path d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"/></svg>'; |
| a.href = '#' + heading.id; |
| heading.insertAdjacentElement('beforeend', a); |
| heading.addEventListener('mouseenter', function () { |
| a.style.visibility = 'initial'; |
| }); |
| heading.addEventListener('mouseleave', function () { |
| a.style.visibility = 'hidden'; |
| }); |
| } |
| }); |
| }); |
| |
| }(jQuery)); |