Greasy Fork is available in English.
Know if a video has subtitles before you click.
// ==UserScript==
// @name YouTube Subtitle Preview
// @namespace https://github.com/ayancey/YoutubeSubtitlePreview
// @version 0.2.1
// @description Know if a video has subtitles before you click.
// @author Alex Yancey
// @match https://www.youtube.com/*
// @grant none
// ==/UserScript==
// Replace this with your target language (ISO language code)
let TARGET_LANGUAGE = "en";
// Check if youtube videos in thumbnails have subtitles in target language. If they do, add a little indicator at the top left of the thumbnail.
function youtube_subtitle_check() {
// Check for different thumbnail styles. This varies depending on if the user is on the old or new YouTube style.
let thumbnail_types = [document.querySelectorAll("div.yt-lockup-thumbnail"), document.querySelectorAll("a.ytd-thumbnail"), document.querySelectorAll("a.thumb-link")];
thumbnail_types.forEach(function (type) {
// Get a list of all video thumbnails
type.forEach(function (thumbnail) {
// Get YT video id for testing
let video_id = "";
if (thumbnail.hasAttribute("href")) {
video_id = thumbnail.getAttribute("href").split("/watch?v=")[1].split("&")[0];
} else {
video_id = thumbnail.querySelector("a").getAttribute("href").split("/watch?v=")[1].split("&")[0];
}
// Make sure we only check once
if (thumbnail.getAttribute("subtitle_tested") == "true") {
return;
}
thumbnail.setAttribute("subtitle_tested", "true");
let xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
let text = xhttp.responseText;
if (text.includes('lang_code="' + TARGET_LANGUAGE + '"') || text.includes('lang_code="' + TARGET_LANGUAGE + '-')) {
// Sorry, this is ugly. I'm not good with JavaScript.
let new_element = document.createElement("div");
new_element.style.backgroundColor = "white";
new_element.style.zIndex = "1000";
new_element.style.position = "absolute";
new_element.style.borderRadius = "8px";
new_element.style.boxShadow = "2px 1px 2px black";
new_element.style.padding = "2px";
new_element.style.textAlign = "center";
new_element.style.left = "2px";
new_element.style.top = "2px";
new_element.style.lineHeight = "normal";
new_element.style.fontFamily = "sans-serif";
new_element.style.fontSize = "8pt";
new_element.style.color = "black";
new_element.style.userSelect = "none";
new_element.innerHTML = TARGET_LANGUAGE.toUpperCase();
thumbnail.appendChild(new_element);
}
}
};
xhttp.open("GET", "https://video.google.com/timedtext?type=list&v=" + video_id, true);
xhttp.send();
});
});
}
// Run on page load and every 3 seconds
youtube_subtitle_check();
setInterval(youtube_subtitle_check, 3000);