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YouTube Like/Dislike Shortcut Lite

Enables keyboard shortcuts to like/dislike a video on YouTube.

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  1. // ==UserScript==
  2. // @name               YouTube Like/Dislike Shortcut Lite
  3. // @name:pt-BR         Atalhos Gostei/Não Gostei no YouTube Lite
  4. // @namespace          will64gamer
  5. // @author             will64gamer
  6. // @description        Enables keyboard shortcuts to like/dislike a video on YouTube.
  7. // @description:pt-BR  Cria atalhos para os botões gostei/não gostei em um vídeo no YouTube.
  8. // @match              *://*.youtube.com/*
  9. // @license            MIT
  10. // @version            1.1
  11. // ==/UserScript==
  12.  
  13. // You can change the codes to whichever keys you want to use for liking, disliking, and opening or writing comments on Shorts.
  14. const codeLike = "NumpadAdd";
  15. const codeDislike = "NumpadSubtract";
  16.  
  17. /* Filling in these quotation marks with the code of a key creates an additional shortcut dedicated to removing your like/dislike,
  18.    that makes it so that pressing the regular shortcuts for liking/disliking multiple times has no effect on the state of that button.
  19.    If you want to use the regular shortcuts for removing likes/dislikes as well, leave this blank.                                     */
  20. let codeRemove = "";
  21.  
  22. // If you want the shortcut to be triggered only when holding ctrl, alt, or shift, change this value from 0 to 1, 2, or 3, respectively.
  23. const combination = 0;
  24.  
  25. //    /\/\/\   Settings   /\/\/\
  26. //  ------------------------------
  27. //    \/\/\/     Code     \/\/\/
  28.  
  29. let tag, timeout, like, dislike;
  30.  
  31. if (typeof(codeRemove) === "string") {codeRemove = codeRemove.trim();}
  32.  
  33. const observer = new MutationObserver(findButtons);
  34.  
  35. addEventListener('yt-page-data-updated', reset);
  36.  
  37. function reset() {
  38.   isVideo = /^\/watch/.test(location.pathname);
  39.   if (isVideo) {
  40.     removeEventListener("keydown", press);
  41.     like = null; dislike = null;
  42.     observer.observe(document.documentElement, {childList: true, subtree: true});
  43.     findButtons();
  44.   }
  45. }
  46.  
  47. function findButtons() {
  48.   if (like && dislike) {
  49.     addEventListener("keydown", press);
  50.     observer.disconnect();
  51.   }
  52.  
  53.   like = document?.getElementsByTagName("like-button-view-model")[0]?.firstElementChild?.firstElementChild?.firstElementChild;
  54.   dislike = document?.getElementsByTagName("dislike-button-view-model")[0]?.firstElementChild?.firstElementChild?.firstElementChild;
  55. }
  56.  
  57. function press(e) {
  58.   if (e.target.getAttribute("contenteditable") === "true") {return;}
  59.  
  60.   tag = e.target.tagName.toLowerCase();
  61.   if (tag === "input" || tag === "textarea") {return;}
  62.  
  63.   switch (combination) {
  64.     case 1:
  65.       if (!e.ctrlKey) {return;}
  66.       break;
  67.     case 2:
  68.       if (!e.altKey) {return;}
  69.       break;
  70.     case 3:
  71.       if (!e.shiftKey) {return;}
  72.       break;
  73.   }
  74.  
  75.   switch (e.code) {
  76.     case codeLike:
  77.       if (like) {
  78.         if (codeRemove && checkPressed(like)) {break;}
  79.         else {like.click();}
  80.       }
  81.     case codeDislike:
  82.       if (dislike) {
  83.         if (codeRemove && checkPressed(dislike)) {break;}
  84.         else {dislike.click();}
  85.       }
  86.       break;
  87.     case codeRemove:
  88.       if (checkPressed(like)) {like.click();}
  89.       else if (checkPressed(dislike)) {dislike.click();}
  90.       break;
  91.   }
  92. }
  93.  
  94. function checkPressed(element) {
  95.   return (element.getAttribute("aria-pressed") === "true");
  96. }