invidious/assets/js/themes.js

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JavaScript
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'use strict';
var toggle_theme = document.getElementById('toggle_theme');
toggle_theme.href = 'javascript:void(0)';
const STORAGE_KEY_THEME = 'dark_mode';
const THEME_DARK = 'dark';
const THEME_LIGHT = 'light';
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// TODO: theme state controlled by system
toggle_theme.addEventListener('click', function () {
const isDarkTheme = helpers.storage.get(STORAGE_KEY_THEME) === THEME_DARK;
const newTheme = isDarkTheme ? THEME_LIGHT : THEME_DARK;
setTheme(newTheme);
helpers.storage.set(STORAGE_KEY_THEME, newTheme);
helpers.xhr('GET', '/toggle_theme?redirect=false', {}, {});
});
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/** @param {THEME_DARK|THEME_LIGHT} theme */
function setTheme(theme) {
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// By default body element has .no-theme class that uses OS theme via CSS @media rules
// It rewrites using hard className below
if (theme === THEME_DARK) {
toggle_theme.children[0].className = 'icon ion-ios-sunny';
document.body.className = 'dark-theme';
} else if (theme === THEME_LIGHT) {
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toggle_theme.children[0].className = 'icon ion-ios-moon';
document.body.className = 'light-theme';
} else {
document.body.className = 'no-theme';
}
}
// Handles theme change event caused by other tab
addEventListener('storage', function (e) {
if (e.key === STORAGE_KEY_THEME)
setTheme(helpers.storage.get(STORAGE_KEY_THEME));
});
// Set theme from preferences on page load
addEventListener('DOMContentLoaded', function () {
const prefTheme = document.getElementById('dark_mode_pref').textContent;
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if (prefTheme) {
setTheme(prefTheme);
helpers.storage.set(STORAGE_KEY_THEME, prefTheme);
}
});