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