violentmonkey - Youtube Thumbnail Replacer

violentmonkey

// ==UserScript==
// @name        Willkuerlich Youtube Thumbnail Replacer
// @namespace   Willkuerlich Tools
// @match       https://www.youtube.com/*
// @grant       none
// @version     1.0
// @author      Willkuerlich
// @description 31.3.2024, 16:56:26
// ==/UserScript==

const replaceImgUrl = 'https://media.istockphoto.com/id/1479180033/de/foto/digitales-auge-ki-digitales-konzept-der-k%C3%BCnstlichen-intelligenz.jpg?s=1024x1024&w=is&k=20&c=GFkgf0--ujAJU74Bp9WQfjBaLWisNImL37zct_kQO3c=';

console.log('Loaded Willkuerlich Youtube Thumbnail Replacer');

function replaceImgElemScr(className) {
  const imgElems = document.getElementsByClassName(className);

  for(let i = 0; i < imgElems.length; i++) {
    const imgElem = imgElems[i];
    imgElem.src = replaceImgUrl;
  }
}

function replaceThumbnails() {
  replaceImgElemScr('yt-core-image yt-core-image--fill-parent-height yt-core-image--fill-parent-width yt-core-image--content-mode-scale-aspect-fill');
  replaceImgElemScr('yt-core-image yt-core-image--fill-parent-height yt-core-image--fill-parent-width yt-core-image--content-mode-scale-aspect-fit');
}

function initialize() {
  console.info('DOM loaded');

  replaceThumbnails();

  setInterval(() => {
    replaceThumbnails();
  }, 100);
}

if (document.readyState === 'loading') {
  document.addEventListener('DOMContentLoaded', initialize);
} else {
  initialize();
}