Displays a "Toggle Description" button to the right of the video publication date to collapse/expand the description. In addition, a hook is added to collapse the description when clicking on empty areas.
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// ==UserScript==
// @name YouTube Toggle Description Button and collapse on empty space click
// @version 1.14
// @description Displays a "Toggle Description" button to the right of the video publication date to collapse/expand the description. In addition, a hook is added to collapse the description when clicking on empty areas.
// @match https://www.youtube.com/*
// @author ChatGPT + Human
// @license MIT
// @namespace http://tampermonkey.net/
// ==/UserScript==
(function() {
'use strict';
// Function that simulates a click on the built-in expand/collapse buttons.
function toggleDescription() {
//const descriptionContainer = document.querySelector('#description-inline-expander');
const collapser = document.querySelector("tp-yt-paper-button#collapse");
if (collapser.hidden) {
const expander = document.querySelector("tp-yt-paper-button#expand");
expander.click();
} else {
collapser.click()
}
}
// Create a toggle button styled similarly to YouTube’s native button.
// We use flex properties to dock the button to the right.
function createStyledToggleButton() {
const btn = document.createElement('tp-yt-paper-button');
btn.id = 'subtle-toggle-button';
btn.textContent = 'Toggle Description';
btn.className = 'style-scope tp-yt-paper-button button ytd-text-inline-expander';
btn.setAttribute('elevation', '0');
btn.setAttribute('role', 'button');
btn.style.cssText = `
color: var(--ytd-text-inline-expander-button-color, var(--yt-spec-text-secondary));
margin: 0;
padding: 0;
font-family: "Roboto", "Arial", sans-serif;
font-size: 1.4rem;
line-height: 2rem;
font-weight: 500;
text-transform: none;
background: transparent;
border: none;
cursor: pointer;
white-space: pre;
text-align: right;
margin-left: auto;
`;
// Clicking the button toggles the description.
btn.addEventListener('click', toggleDescription);
return btn;
}
// Insert the toggle button into the info container and force flex layout.
function addToggleButton() {
const infoContainer = document.querySelector('#info-container');
if (!infoContainer) return;
// Force the container into a flex layout.
infoContainer.style.setProperty('display', 'flex', 'important');
infoContainer.style.setProperty('align-items', 'center', 'important');
// Avoid duplicates.
if (document.querySelector('#subtle-toggle-button')) return;
const toggleButton = createStyledToggleButton();
infoContainer.appendChild(toggleButton);
}
// Add an event listener to the description expander so that when it is expanded,
// clicking on any non-interactive (empty) space collapses the description.
function addDescriptionCollapseListener() {
const descExpander = document.querySelector('#description-inline-expander');
if (!descExpander) return;
// Only add once.
if (descExpander.dataset.collapseListenerAdded) return;
descExpander.addEventListener('click', function(e) {
// Check if the description is expanded (collapse button is visible)
const collapser = descExpander.querySelector('tp-yt-paper-button#collapse');
if (!collapser.hidden) {
// Only act if you did not click on an interactive element (like a link or a button).
if (!e.target.closest('a, button, tp-yt-paper-button')) {
collapser.click();
// Prevent any other click handling (for example, YouTube’s own expand logic).
e.stopPropagation();
}
}
});
descExpander.dataset.collapseListenerAdded = 'true';
}
// Combine the toggle button and the collapse listener setup.
function addToggleButtonAndCollapseListener() {
addToggleButton();
// Comment below line to disable empty space collapse behaviour
addDescriptionCollapseListener();
}
// Use a persistent MutationObserver to re-add the button and listener if needed.
const observer = new MutationObserver(() => {
addToggleButtonAndCollapseListener();
});
observer.observe(document.body, { childList: true, subtree: true });
})();