- // ==UserScript==
- // @name Automatic Material Dark-Mode for YouTube
- // @namespace SteveJobzniak
- // @version 1.7.0
- // @description A low-tech solution to a high-tech problem! Automatically clicks YouTube's "Dark Mode" button if dark mode isn't already active.
- // @author SteveJobzniak
- // @homepage https://greasyfork.org/scripts/32954-automatic-material-dark-mode-for-youtube
- // @license https://www.apache.org/licenses/LICENSE-2.0
- // @contributionURL https://www.paypal.me/Armindale/0usd
- // @match *://www.youtube.com/*
- // @exclude *://www.youtube.com/tv*
- // @exclude *://www.youtube.com/embed/*
- // @run-at document-end
- // @grant none
- // @noframes
- // ==/UserScript==
-
- (function() {
- 'use strict';
-
- /* --- START: Utils-MultiRetry v1.1 by SteveJobzniak --- */
-
- /* Performs multiple retries of a function call until it either succeeds or has failed all attempts. */
- var retryFnCall = function(fnCallback, maxAttempts, waitDelay) {
- // Default parameters: 40 * 50ms = Max ~2 seconds of additional retries.
- maxAttempts = (typeof maxAttempts !== 'undefined') ? maxAttempts : 40;
- waitDelay = (typeof waitDelay !== 'undefined') ? waitDelay : 50;
-
- // If we don't succeed immediately, we'll perform multiple retries.
- var success = fnCallback();
- if (!success) {
- var attempt = 0;
- var searchTimer = setInterval(function() {
- var success = fnCallback();
-
- // If we've reached max attempts or found success, we must now stop the interval timer.
- if (++attempt >= maxAttempts || success) {
- clearInterval(searchTimer);
- }
- }, waitDelay);
- }
- };
-
- /* --- END: Utils-MultiRetry by SteveJobzniak --- */
-
- /* --- START: Utils-ElementFinder v1.3 by SteveJobzniak --- */
-
- /* Searches for a specific element. */
- var findElement = function(parentElem, elemQuery, expectedLength, selectItem, fnCallback) {
- var elems = parentElem.querySelectorAll(elemQuery);
- if (elems.length === expectedLength) {
- var item = elems[selectItem];
- fnCallback(item);
- return true;
- }
-
- //console.log('Debug: Cannot find "'+elemQuery+'".');
- return false;
- };
-
- var retryFindElement = function(parentElem, elemQuery, expectedLength, selectItem, fnCallback, maxAttempts, waitDelay) {
- // If we can't find the element immediately, we'll perform multiple retries.
- retryFnCall(function() {
- return findElement(parentElem, elemQuery, expectedLength, selectItem, fnCallback);
- }, maxAttempts, waitDelay);
- };
-
- /* Searches for multiple different elements and uses the earliest match. */
- var multiFindElement = function(queryList, fnCallback) {
- for (var i = 0, len = queryList.length; i < len; ++i) {
- var query = queryList[i];
- var success = findElement(query.parentElem, query.elemQuery, query.expectedLength, query.selectItem, fnCallback);
- if (success) {
- // Don't try any other queries, since we've found a successful match.
- return true;
- }
- }
-
- return false;
- };
-
- var retryMultiFindElement = function(queryList, fnCallback, maxAttempts, waitDelay) {
- // If we can't find any of the elements immediately, we'll perform multiple retries.
- retryFnCall(function() {
- return multiFindElement(queryList, fnCallback);
- }, maxAttempts, waitDelay);
- };
-
- /* --- END: Utils-ElementFinder by SteveJobzniak --- */
-
- /* Automatically enables YouTube's dark mode theme. */
- var enableDark = function() {
- // Refuse to proceed if the user is on the old non-Material YouTube theme (which has no dark mode).
- // NOTE: This is just to avoid getting "error reports" by people who aren't even on YouTube's new theme.
- var oldYouTube = document.getElementById('body-container');
- if (oldYouTube && document.body.id === 'body') {
- var errorMessage = 'You are using the old YouTube theme. Enable the new theme <a href="https://youtube.com/new" style="color:#fff;text-decoration:underline">here</a>.';
- var errorDiv = document.createElement('div');
- errorDiv.style.position = 'fixed';
- errorDiv.style.bottom = 0;
- errorDiv.style.left = 0;
- errorDiv.style.width = '100%';
- errorDiv.style.padding = '10px';
- errorDiv.style.textAlign = 'center';
- errorDiv.style.fontSize = '130%';
- errorDiv.style.fontWeight = 'bold';
- errorDiv.style.color = '#fff';
- errorDiv.style.backgroundColor = 'rgba(244, 67, 54, 0.9)';
- errorDiv.style.zIndex = '99999';
- errorDiv.innerHTML = errorMessage;
- document.body.appendChild(errorDiv);
-
- return;
- }
-
- // Wait until the settings menu is available, to ensure that YouTube's "dark mode state" and code has been loaded...
- // Note that this particular menu button always exists (both when logged in and when logged out of your account),
- // but its actual icon and the list of submenu choices differ. However, its "dark mode" submenus are the same in either case.
- retryFnCall(function() {
- // The menu button count varies based on the browser. We expect to find either 2 or 3 buttons, and the settings menu
- // is always the last button (even when logged in). Sadly there is no better way to find the correct button,
- // since YouTube doesn't have any identifiable language-agnostic labels or icons in the HTML. Sigh...
- var buttons = document.querySelectorAll('ytd-topbar-menu-button-renderer button');
- if (buttons.length !== 2 && buttons.length !== 3) {
- return false; // Failed to find any of the expected menu button counts. Retry...
- }
- var settingsMenuButton = buttons[buttons.length - 1];
-
- // Check the dark mode state "flag" and abort processing if dark mode is already active.
- if (document.documentElement.getAttribute('dark') === 'true') {
- return true; // Stop retrying...
- }
-
- // We MUST open the "settings" menu, otherwise nothing will react to the "toggle dark mode" event!
- settingsMenuButton.click();
-
- // Wait a moment for the settings-menu to open up after clicking...
- retryFindElement(document, 'div#label.style-scope.ytd-toggle-theme-compact-link-renderer', 1, 0, function(darkModeSubMenuButton) {
- // Next, go to the "toggle dark mode" settings sub-page.
- darkModeSubMenuButton.click();
-
- // Wait a moment for the settings sub-page to switch...
- retryFindElement(document, 'ytd-toggle-item-renderer.style-scope.ytd-multi-page-menu-renderer', 1, 0, function(darkModeSubPageContainer) {
- // Get a reference to the "activate dark mode" button...
- retryFindElement(darkModeSubPageContainer, 'paper-toggle-button.style-scope.ytd-toggle-item-renderer', 1, 0, function(darkModeButton) {
- // We MUST now use this very ugly, hardcoded sleep-timer to ensure that YouTube's "activate dark mode" code is fully
- // loaded; otherwise, YouTube will be completely BUGGED OUT and WON'T save the fact that we've enabled dark mode!
- // Since JavaScript is single-threaded, this timeout simply ensures that we'll leave our current code so that we allow
- // YouTube's event handlers to deal with loading the settings-page, and then the timeout gives control back to us.
- setTimeout(function() {
- // Now simply click YouTube's button to enable their dark mode.
- darkModeButton.click();
-
- // And lastly, give keyboard focus back to the input search field... (We don't need any setTimeout here...)
- retryFindElement(document, 'input#search', 1, 0, function(searchField) {
- searchField.click(); // First, click the search-field to force the settings-panel to close...
- searchField.focus(); // ...and finally give the search-field focus! Voila!
- });
- }, 30); // We can use 0ms here for "as soon as possible" instead, but our "at least 30ms" might be safer just in case.
- });
- });
- });
-
- return true; // Stop retrying, since we've found and clicked the menu...
- }, 120, 50); // 120 * 50ms = ~6 seconds of retries.
-
- // Alternative method, which switches using an internal YouTube event instead of clicking
- // the menus... I decided to disable this method, since it relies on intricate internal
- // details, and it still requires their menu to be open to work anyway (because their
- // code for changing theme isn't active until the Dark Mode settings menu is open),
- // so we may as well just click the actual menu items. ;-)
- /*
- var ytDebugMenu = document.querySelectorAll('ytd-debug-menu');
- ytDebugMenu = (ytDebugMenu.length === 1 ? ytDebugMenu[0] : undefined);
- if( ytDebugMenu ) {
- ytDebugMenu.fire(
- 'yt-action',
- {
- actionName:'yt-signal-action-toggle-dark-theme-on',
- optionalAction:false,
- args:[
- {signalAction:{signal:'TOGGLE_DARK_THEME_ON'}},
- toggleMenuElem,
- undefined
- ],
- returnValue: []
- },
- {}
- );
- }
- */
-
- // Also note that it may be possible to simply modify the YouTube cookies, by changing
- // "PREF=f1=50000000;" to "PREF=f1=50000000&f6=400;" (dark mode on) and then reloading the page.
- // However, a reload is always slower than toggling the settings menu, so I didn't do that.
- };
-
- if (document.readyState === 'complete') {
- enableDark();
- } else {
- document.addEventListener('readystatechange', function(evt) {
- if (document.readyState === 'complete') {
- enableDark();
- }
- });
- }
- })();