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Improves YouTube Livechat emoji performance (and other stuff eventually)
// ==UserScript==
// @name YouTube - Livechat Emoji Fixes
// @namespace https://gist.github.com/lbmaian/e2a60a4aa2c534c1575547a60711613a
// @version 0.3
// @description Improves YouTube Livechat emoji performance (and other stuff eventually)
// @author lbmaian
// @match https://www.youtube.com/live_chat*
// @icon https://www.youtube.com/favicon.ico
// @run-at document-end
// @grant none
// ==/UserScript==
(function() {
'use strict';
const logContext = '[YouTube - Livechat Emoji Fixes]';
function debug(...args) {
//console.debug(logContext, ...args); // uncomment to disable debugging
}
function log(...args) {
console.log(logContext, ...args);
}
function warn(...args) {
console.warn(logContext, ...args);
}
function error(...args) {
console.error(logContext, ...args);
}
function waitForLiveChatMessageInput(callback, ...args) {
const eltMessageInput = document.getElementById('live-chat-message-input');
if (eltMessageInput) {
callback(eltMessageInput, ...args);
} else {
new MutationObserver((records, observer) => {
const eltMessageInput = document.getElementById('live-chat-message-input');
if (eltMessageInput) {
observer.disconnect();
callback(eltMessageInput, ...args);
}
}).observe(document.body, {
childList: true,
subtree: true,
});
}
}
function watchEmojiPickers(eltMessageInput) {
debug('#live-chat-message-input', eltMessageInput);
// Hack to remove the 'When you send a message, people will be able to see that you subscribe to this channel.' one-time tooltip whenever it pops up
const eltApp = eltMessageInput.closest('yt-live-chat-app');
debug('yt-live-chat-app', eltApp);
new MutationObserver((records, observer) => {
for (const record of records) {
for (const node of record.addedNodes) {
if (node.nodeType === 1 && node.tagName.toLowerCase() === 'tp-yt-iron-dropdown') {
debug('found tp-yt-iron-dropdown', node);
// Note: the 'When you send a message, people will be able to see that you subscribe to this channel.' hasn't been set yet,
// so we can't filter for that, so just filter out any tooltip (afaik, this is the only such tooltip anyway).
const eltTooltipRenderer = node.firstElementChild?.firstElementChild;
if (eltTooltipRenderer && eltTooltipRenderer.tagName.toLowerCase() === 'yt-tooltip-renderer') {
//observer.disconnect(); // not disconnecting in case more tooltips pop up
log('removing tooltip', eltTooltipRenderer);
node.remove();
}
}
}
}
}).observe(eltApp, {
childList: true,
});
// yt-live-chat-app > div#contents > yt-live-chat-renderer > iron-pages#content-pages > div#chat-messages > div#contents (note: non-unique id)
// div#ticker
// div#chat
// iframe#chatframe
// ytd-message-renderer.ytd-live-chat-frame
// iron-pages#panel-pages
// div#input-panel (message input)
// yt-live-chat-message-input-renderer#live-chat-message-input>div#container (always exists?)
// div#top > div#input-container > yt-live-chat-text-input-field-renderer#input
// div#input (text input; note: non-unique id)
// tp-yt-iron-dropdown#dropdown (emoji dropdown when manually typing :...)
// iron-pages#pickers>yt-emoji-picker-renderer#emoji (emoji picker)
// div#search-panel
// div#category-buttons (emoji picker category buttons)
// div#categories-wrapper>div#categories (emoji picker categories)
// yt-emoji-picker-category-renderer (emoji picker category)
// div#buttons
// div#picker-buttons>yt-live-chat-icon-toggle-button-renderer#emoji (emoji picker toggle)
// div#buy-flow (superchat buying)
// yt-live-chat-message-buy-flow-renderer (only exists when buying superchats or milestone chats)
// iron-pages>div#preview>div#message>div#pickers-container
// iron-pages#pickers>yt-emoji-picker-renderer#emoji (emoji picker - same as above)
// div#picker-buttons>yt-live-chat-icon-toggle-button-renderer#emoji (emoji picker toggle - same as above)
watchEmojiPicker(eltMessageInput, true);
// Superchat emoji picker only exists when div#buy-flow is non-empty (its empty whenever not buying superchats or milestone chats),
// so need to watch for when it's added.
const eltBuyflow = document.getElementById('buy-flow');
debug('#buy-flow', eltBuyflow);
new MutationObserver((records, observer) => {
for (const record of records) {
for (const node of record.addedNodes) {
if (node.nodeType === 1 && node.tagName.toLowerCase() === 'yt-live-chat-message-buy-flow-renderer') {
const eltBuyflowRenderer = node;
debug('yt-live-chat-message-buy-flow-renderer', eltBuyflowRenderer);
watchEmojiPicker(eltBuyflowRenderer, false);
return;
}
}
}
}).observe(eltBuyflow, {
childList: true,
});
}
function watchEmojiPicker(eltContainer, watchForCategoriesRemoval) {
// "categories" id isn't necessarily unique, so not using document.getElementById.
const eltCategories = eltContainer.querySelector('#categories');
// If chat is hidden, emoji categories won't be found.
if (!eltCategories) {
log('#categories not found - assuming chat is hidden');
return;
}
log('watching #categories', eltCategories, 'in container', eltContainer);
// Simply remove emoji categories that contain SVGs. Only members-only and YouTube-specific emojis should remain.
new MutationObserver((records, observer) => {
for (const record of records) {
for (const node of record.addedNodes) {
if (node.nodeType === 1) { // element
for (const child of node.children) {
if (child.id === 'emoji') {
const eltEmoji = child.firstElementChild;
if (eltEmoji && eltEmoji.src && eltEmoji.src.endsWith('svg')) {
log('removing category', node);
eltCategories.removeChild(node);
break;
}
}
}
}
}
}
}).observe(eltCategories, {
childList: true,
});
if (watchForCategoriesRemoval) {
// When user joins membership, #categories is removed and refreshed, so need to rewatch emoji pickers.
// Specifically, the #live-chat-message-input container gets replaced within its parent #input-panel.
debug('watching for #categories removal up to', eltContainer.parentElement);
watchForElementRemoval(eltCategories, () => {
log('#categories', eltCategories, 'was removed - assuming it was refreshed');
// Should already be replaced, but if it's somehow not, will wait for it.
waitForLiveChatMessageInput(watchEmojiPicker, watchForCategoriesRemoval)
}, eltContainer.parentElement);
}
// Hide the category picker since there's only going to be 1 or 2 emoji categories. Also has non-unique id.
const eltCategoryButtons = eltContainer.querySelector('#category-buttons');
if (eltCategoryButtons) {
log('removed #category-buttons', eltCategoryButtons);
eltCategoryButtons.remove();
} else {
log('#category-buttons not found - ignoring');
}
}
// Unfortunately there's no direct way to watch for a target element being removed.
// The most performant way I've found so far is to recursively observe child removals for all the ancestors of the target up to root
// (as opposed to observing the whole subtree of the root for removals, which is much more expensive).
// When the target element is removed, given callback is called with (target, the ancestor that removed the subtree containing target).
// If the root already does not contain the target, logs an error and throws.
function watchForElementRemoval(target, callback, root) {
if (!root) {
root = target.ownerDocument;
}
if (!root.contains(target)) {
error('root', root, 'does not contain target', target);
throw new Error('root does not contain target');
}
if (root.nodeType === 9) { // document
root = root.documentElement;
}
const observer = new MutationObserver((records, observer) => {
// If root is document element, probably faster to check for target.isConnected (assuming that element hasn't been re-added)
// but following allows determining what exactly removed the element
for (const record of records) {
let found = false;
for (const node of record.removedNodes) {
if (node.contains(target)) {
debug('element', target, 'was removed via ancestor', record.target);
if (!found) {
found = true;
observer.disconnect();
debug('all mutation records:', records);
}
callback(target, record.target);
}
}
}
});
const options = {
childList: true,
};
let element = target.parentNode; // don't observe the target (or rather, its children) itself
let end = root.parentNode; // ensure root is observed in following loop
while (element !== end) {
observer.observe(element, options);
element = element.parentNode;
}
}
// Workaround for any iframes that were document.write'd having its location inherit from the calling code's frame
// (e.g. if document.write called from either a script in parent frame or extension content script matching parent frame,
// then the iframe's location would be the same as parent frame's location).
const url = frameElement && frameElement.contentDocument?.URL === parent.document.URL ? frameElement.src || 'about:blank' : document.URL;
debug('url:', url);
if (url.startsWith('https://www.youtube.com/live_chat')) {
waitForLiveChatMessageInput(watchEmojiPickers);
}
})();