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f54fbd057e
* Add prefers-color-scheme support This should fix <https://github.com/omarroth/invidious/issues/559>. The cookie storage format has been changed from boolean ("true"/"false") to tri-state ("dark"/"light"/""), so that users without a cookie set will get dark mode if they have enabled the dark theme in their operating system. The code for handling the cookie state, along with the user's operating system theme, has been factored out into a new function `update_mode`, which is called both at window load and at the "storage" event listener, because the "storage" event listener is only trigerred when a change is made to the localStorage from another tab/window (for more info - see <https://stackoverflow.com/a/4679754>).
59 lines
2.1 KiB
JavaScript
59 lines
2.1 KiB
JavaScript
var toggle_theme = document.getElementById('toggle_theme');
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toggle_theme.href = 'javascript:void(0);';
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toggle_theme.addEventListener('click', function () {
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var dark_mode = document.getElementById('dark_theme').media === 'none';
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var url = '/toggle_theme?redirect=false';
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var xhr = new XMLHttpRequest();
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xhr.responseType = 'json';
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xhr.timeout = 10000;
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xhr.open('GET', url, true);
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set_mode(dark_mode);
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window.localStorage.setItem('dark_mode', dark_mode ? 'dark' : 'light');
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xhr.send();
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});
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window.addEventListener('storage', function (e) {
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if (e.key === 'dark_mode') {
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update_mode(e.newValue);
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}
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});
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window.addEventListener('load', function () {
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window.localStorage.setItem('dark_mode', document.getElementById('dark_mode_pref').textContent);
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// Update localStorage if dark mode preference changed on preferences page
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update_mode(window.localStorage.dark_mode);
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});
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function set_mode (bool) {
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document.getElementById('dark_theme').media = !bool ? 'none' : '';
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document.getElementById('light_theme').media = bool ? 'none' : '';
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if (bool) {
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toggle_theme.children[0].setAttribute('class', 'icon ion-ios-sunny');
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} else {
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toggle_theme.children[0].setAttribute('class', 'icon ion-ios-moon');
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}
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}
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function update_mode (mode) {
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if (mode === 'true' /* for backwards compatibility */ || mode === 'dark') {
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// If preference for dark mode indicated
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set_mode(true);
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}
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else if (mode === 'false' /* for backwards compaibility */ || mode === 'light') {
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// If preference for light mode indicated
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set_mode(false);
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}
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else if (document.getElementById('dark_mode_pref').textContent === '' && window.matchMedia('(prefers-color-scheme: dark)').matches) {
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// 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
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set_mode(true);
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}
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// else do nothing, falling back to the mode defined by the `dark_mode` preference on the preferences page (backend)
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}
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