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);';
toggle_theme.addEventListener('click', function () {
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var dark_mode = document.body.classList.contains('light-theme');
var url = '/toggle_theme?redirect=false';
var xhr = new XMLHttpRequest();
xhr.responseType = 'json';
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xhr.timeout = 10000;
xhr.open('GET', url, true);
set_mode(dark_mode);
try {
window.localStorage.setItem('dark_mode', dark_mode ? 'dark' : 'light');
} catch (e) {}
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xhr.send();
});
window.addEventListener('storage', function (e) {
if (e.key === 'dark_mode') {
update_mode(e.newValue);
}
});
window.addEventListener('DOMContentLoaded', function () {
const dark_mode = document.getElementById('dark_mode_pref').textContent;
try {
// Update localStorage if dark mode preference changed on preferences page
window.localStorage.setItem('dark_mode', dark_mode);
} catch (e) {}
update_mode(dark_mode);
});
var darkScheme = window.matchMedia('(prefers-color-scheme: dark)');
var lightScheme = window.matchMedia('(prefers-color-scheme: light)');
darkScheme.addListener(scheme_switch);
lightScheme.addListener(scheme_switch);
function scheme_switch (e) {
// ignore this method if we have a preference set
try {
if (localStorage.getItem('dark_mode')) {
return;
}
} catch (exception) {}
if (e.matches) {
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if (e.media.includes('dark')) {
set_mode(true);
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} else if (e.media.includes('light')) {
set_mode(false);
}
}
}
function set_mode (bool) {
if (bool) {
// dark
toggle_theme.children[0].setAttribute('class', 'icon ion-ios-sunny');
document.body.classList.remove('no-theme');
document.body.classList.remove('light-theme');
document.body.classList.add('dark-theme');
} else {
// light
toggle_theme.children[0].setAttribute('class', 'icon ion-ios-moon');
document.body.classList.remove('no-theme');
document.body.classList.remove('dark-theme');
document.body.classList.add('light-theme');
}
}
function update_mode (mode) {
if (mode === 'true' /* for backwards compatibility */ || mode === 'dark') {
// If preference for dark mode indicated
set_mode(true);
}
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else if (mode === 'false' /* for backwards compatibility */ || mode === 'light') {
// If preference for light mode indicated
set_mode(false);
}
else if (document.getElementById('dark_mode_pref').textContent === '' && window.matchMedia('(prefers-color-scheme: dark)').matches) {
// If no preference indicated here and no preference indicated on the preferences page (backend), but the browser tells us that the operating system has a dark theme
set_mode(true);
}
// else do nothing, falling back to the mode defined by the `dark_mode` preference on the preferences page (backend)
}