121 lines
4.5 KiB
JavaScript
121 lines
4.5 KiB
JavaScript
(function() {
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// Functions
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// =========================================================================
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/**
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* Adds event listeners to change active stylesheet and restore previously
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* activated stylesheet on reload.
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*
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* @example
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*
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* This link:
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* <a href="#" data-link-title="Foo">Foo</a>
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* Will active this existing link:
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* <link rel="stylesheet alternate" title="Foo" href="..." >
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*
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* @example
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*
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* This link:
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* <a href="#" data-link-href="path/to/file.css">Bar</a>
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* Will activate this existing link:
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* <link rel="stylesheet alternate" title="[someID]" href="path/to/file.css" >
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* Or generate this active link:
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* <link rel="stylesheet" title="Bar" href="path/to/file.css" >
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*/
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function initStyleSwitcher() {
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var isInitialzed = false;
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var sessionStorageKey = 'activeStylesheetHref';
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function handleSwitch(activeHref, activeTitle) {
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var activeElm = document.querySelector('link[href*="' + activeHref +'"],link[title="' + activeTitle +'"]');
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if (!activeElm && activeHref) {
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activeElm = document.createElement('link');
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activeElm.setAttribute('href', activeHref);
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activeElm.setAttribute('rel', 'stylesheet');
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activeElm.setAttribute('title', activeTitle);
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document.head.appendChild(activeElm);
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activeElm.addEventListener('load', function linkOnLoad() {
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activeElm.removeEventListener('load', linkOnLoad);
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setActiveLink(activeElm);
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});
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}
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else if (activeElm) {
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setActiveLink(activeElm);
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}
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}
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function setActiveLink(activeElm) {
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var activeHref = activeElm.getAttribute('href');
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var activeTitle = activeElm.getAttribute('title');
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var inactiveElms = document.querySelectorAll('link[title]:not([href*="' + activeHref +'"]):not([title="' + activeTitle +'"])');
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// Remove "alternate" keyword
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activeElm.setAttribute('rel', (activeElm.rel || '').replace(/\s*alternate/g, '').trim());
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// Force enable stylesheet (required for some browsers)
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activeElm.disabled = true;
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activeElm.disabled = false;
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// Store active style sheet
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sessionStorage.setItem(sessionStorageKey, activeHref);
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// Disable other elms
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for (var i = 0; i < inactiveElms.length; i++) {
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var elm = inactiveElms[i];
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elm.disabled = true;
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// Fix for browsersync and alternate stylesheet updates. Will
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// cause FOUC when switching stylesheets during development, but
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// required to properly apply style updates when alternate
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// stylesheets are enabled.
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if (window.browsersyncObserver) {
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var linkRel = elm.getAttribute('rel') || '';
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var linkRelAlt = linkRel.indexOf('alternate') > -1 ? linkRel : (linkRel + ' alternate').trim();
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elm.setAttribute('rel', linkRelAlt);
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}
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}
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// CSS custom property ponyfil
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if ((window.$docsify || {}).themeable) {
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window.$docsify.themeable.util.cssVars();
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}
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}
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// Event listeners
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if (!isInitialzed) {
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isInitialzed = true;
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// Restore active stylesheet
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document.addEventListener('DOMContentLoaded', function() {
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var activeHref = sessionStorage.getItem(sessionStorageKey);
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if (activeHref) {
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handleSwitch(activeHref);
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}
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});
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// Update active stylesheet
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document.addEventListener('click', function(evt) {
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var dataHref = evt.target.getAttribute('data-link-href');
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var dataTitle = evt.target.getAttribute('data-link-title')
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if (dataHref || dataTitle) {
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dataTitle = dataTitle
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|| evt.target.textContent
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|| '_' + Math.random().toString(36).substr(2, 9); // UID
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handleSwitch(dataHref, dataTitle);
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evt.preventDefault();
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}
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});
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}
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}
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// Main
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// =========================================================================
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initStyleSwitcher();
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})();
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