52 lines
1.5 KiB
JavaScript
52 lines
1.5 KiB
JavaScript
// initialize default value
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function getTheme() {
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return localStorage.getItem('theme') ? localStorage.getItem('theme') : null;
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}
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function setTheme(style) {
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document.documentElement.setAttribute('data-theme', style);
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localStorage.setItem('theme', style);
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}
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function init() {
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// initialize default value
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const theme = getTheme();
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// check if a preferred color theme is set for users that have never been to our site
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const userPrefersDark = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
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if (theme === null) {
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if (userPrefersDark) {
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setTheme('dark');
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} else if (!document.documentElement.getAttribute('data-theme')) {
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setTheme('light');
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} else {
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setTheme(document.documentElement.getAttribute('data-theme'));
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}
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} else {
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// load a stored theme
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if (theme === 'light') {
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document.documentElement.setAttribute('data-theme', 'light');
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} else {
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document.documentElement.setAttribute('data-theme', 'dark');
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}
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}
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}
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// switch themes
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function switchTheme() {
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const theme = getTheme();
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if (theme === 'light') {
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setTheme('dark');
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} else {
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setTheme('light');
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}
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}
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document.addEventListener('DOMContentLoaded', function () {
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const themeSwitcher = document.querySelector('.theme-switch');
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themeSwitcher.addEventListener('click', switchTheme, false);
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}, false);
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init();
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