// ==UserScript==
// @name Youtube subtitles
// @namespace http://fqdeng.com
// @version 1.0.1
// @description show the subtitels like lyrics plane
// @author fqdeng
// @match https://www.youtube.com/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant none
// @require https://code.jquery.com/jquery-3.6.0.min.js
// @require https://code.jquery.com/ui/1.12.1/jquery-ui.min.js
// @license MIT
// ==/UserScript==
(function() {
'use strict';
let draggableDiv = null;
let contentDiv = null;
let windowDiv = null;
const textArea = document.createElement('textarea');
function getVideoIdFromUrl() {
const urlParams = new URLSearchParams(window.location.search);
return urlParams.get('v');
}
function isYouTubeVideoUrl() {
var url = window.location.href;
var pattern = /^https:\/\/www\.youtube\.com\/watch\?v=[\w-]+/;
return pattern.test(url);
}
function onPageChanged() {
console.log('url change');
if (!isYouTubeVideoUrl()){
if (draggableDiv){
$(draggableDiv).hide()
}
}else{
if (draggableDiv){
$(draggableDiv).show()
}
}
loadSubtitles();
}
function decodeHtmlEntities(text) {
textArea.innerHTML = text;
return textArea.value;
}
function updateSubtitleScroll(videoTime) {
const subtitles = contentDiv.getElementsByTagName('div');
let activeFound = false; // Track if the active subtitle has been found and highlighted
for (let i = 0; i < subtitles.length; i++) {
const subtitleData = subtitles[i].dataset;
const start = parseFloat(subtitleData.start);
const duration = parseFloat(subtitleData.dur);
if (start <= videoTime && videoTime <= start + duration) {
subtitles[i].style.backgroundColor = 'orange';
subtitles[i].scrollIntoView({ behavior: 'smooth', block: 'center' });
activeFound = true;
} else {
subtitles[i].style.backgroundColor = ''; // Reset background color for non-active subtitles
}
}
// If no active subtitle is found (e.g., between subtitles), ensure all are reset
if (!activeFound) {
for (let i = 0; i < subtitles.length; i++) {
subtitles[i].style.backgroundColor = '';
}
}
}
function setupVideoPlayerListener() {
var player = document.getElementsByTagName("video")[0];
if (player) {
setInterval(() => {
const currentTime = player.currentTime;
updateSubtitleScroll(currentTime);
}, 1000); // Update every second
} else {
setTimeout(setupVideoPlayerListener, 1000); // Retry after 1 second if player not ready
}
}
function loadSubtitles() {
// Clear existing subtitles
contentDiv.innerHTML = ''; // Or use the loop method if preferred
// Load and display subtitles
renderSubtitles(getVideoIdFromUrl()).then(subtitles => {
if (subtitles) {
subtitles.forEach(subtitle => {
const subtitleDiv = document.createElement('div');
subtitleDiv.style.fontSize = '16px'; // Apply font size to each subtitle
subtitleDiv.style.lineHeight = '1.4';
subtitleDiv.style.marginBottom = '5px'; // Add space between subtitles
const startTime = parseFloat(subtitle.start).toFixed(2);
const duration = parseFloat(subtitle.dur).toFixed(2);
subtitleDiv.textContent = `${decodeHtmlEntities(subtitle.text)}`;
subtitleDiv.dataset.start = subtitle.start;
subtitleDiv.dataset.dur = subtitle.dur;
contentDiv.appendChild(subtitleDiv);
});
}
});
}
function renderDragableDiv(){
// Load jQuery UI CSS
const cssLink = document.createElement('link');
cssLink.rel = 'stylesheet';
cssLink.href = 'https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css';
document.head.appendChild(cssLink);
// Function to save position and size to localStorage
function savePositionAndSize(left, top, width, height) {
localStorage.setItem('draggableSubtitlesPosition', JSON.stringify({ left, top, width, height }));
}
// Function to get position and size from localStorage
function getPositionAndSize() {
const savedPosition = localStorage.getItem('draggableSubtitlesPosition');
return savedPosition ? JSON.parse(savedPosition) : { left: '859px', top: '83px', width: '384.891px', height: '436px' };
}
// Wait for the document to be ready
$(document).ready(function() {
// Get initial position and size from localStorage
const initialPositionAndSize = getPositionAndSize();
// Create draggable and resizable window elements
draggableDiv = document.createElement('div');
draggableDiv.id = 'draggableSubtitles';
Object.assign(draggableDiv.style, {
width: initialPositionAndSize.width,
height: initialPositionAndSize.height,
zIndex: 1000,
padding: '0.5em',
backgroundColor: '#f0f0f0',
border: '1px solid #ccc',
position: 'absolute',
left: initialPositionAndSize.left,
top: initialPositionAndSize.top,
});
//init then hide
$(draggableDiv).hide();
const headerDiv = document.createElement('div');
headerDiv.className = 'header';
Object.assign(headerDiv.style, {
cursor: 'move',
backgroundColor: '#ccc',
padding: '10px',
textAlign: 'center',
fontWeight: 'bold'
});
headerDiv.textContent = 'Drag me';
contentDiv = document.createElement('div');
contentDiv.className = 'content';
contentDiv.style.padding = '10px';
windowDiv = document.createElement('div');
Object.assign(windowDiv.style, {
overflow: 'auto',
position: 'absolute',
width: '95%',
height: '90%',
});
// Assemble the draggable and resizable window
windowDiv.appendChild(contentDiv);
draggableDiv.appendChild(headerDiv);
draggableDiv.appendChild(windowDiv);
// Append the draggable and resizable window to the body
document.body.appendChild(draggableDiv);
// Make the window draggable
$('#draggableSubtitles').draggable({
handle: '.header',
stop: function(event, ui) {
const left = ui.position.left + 'px';
const top = ui.position.top + 'px';
const width = $('#draggableSubtitles').width() + 'px';
const height = $('#draggableSubtitles').height() + 'px';
savePositionAndSize(left, top, width, height);
}
});
// Make the window resizable
$('#draggableSubtitles').resizable({
stop: function(event, ui) {
const left = ui.position.left + 'px';
const top = ui.position.top + 'px';
const width = ui.size.width + 'px';
const height = ui.size.height + 'px';
savePositionAndSize(left, top, width, height);
}
});
});
}
// Function to load subtitles
async function renderSubtitles(videoId) {
try {
if (!videoId) {
console.error('Invalid YouTube URL');
return;
}
// Fetch video page HTML
const response = await fetch(`https://www.youtube.com/watch?v=${videoId}`);
const pageHtml = await response.text();
// Extract player response JSON from the HTML
const playerResponseRegex = /ytInitialPlayerResponse\s*=\s*(\{.*?\});/;
const playerResponseMatch = pageHtml.match(playerResponseRegex);
if (!playerResponseMatch) {
console.error('Could not extract player response');
return;
}
const playerResponse = JSON.parse(playerResponseMatch[1]);
// Get subtitle tracks
const captionTracks = playerResponse.captions?.playerCaptionsTracklistRenderer?.captionTracks;
if (!captionTracks || captionTracks.length === 0) {
console.error('No subtitles found for this video');
return;
}
// Fetch subtitles for the first track
const subtitleTrackUrl = captionTracks[0].baseUrl;
const subtitlesResponse = await fetch(subtitleTrackUrl);
const subtitlesXml = await subtitlesResponse.text();
// Parse XML and extract subtitles
const parser = new DOMParser();
const subtitlesDoc = parser.parseFromString(subtitlesXml, 'text/xml');
const texts = subtitlesDoc.getElementsByTagName('text');
// existing code to fetch and parse subtitles...
const subtitles = [];
for (let i = 0; i < texts.length; i++) {
const start = texts[i].getAttribute('start');
const dur = texts[i].getAttribute('dur');
let text = texts[i].textContent;
text = decodeHtmlEntities(text); // Decode HTML entities here
subtitles.push({ start, dur, text });
}
console.log('Subtitles:', subtitles);
return subtitles;
} catch (error) {
console.error('An error occurred:', error);
}
}
function main(){
renderDragableDiv();
//handle youtube page changed event
window.addEventListener('yt-page-data-updated', onPageChanged);
setupVideoPlayerListener();
}
main();
})();
