youtube.dislikes.tampermonkey.js

// ==UserScript==
// @name         YouTube Dislike
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://www.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function sleep(ms) {
        return new Promise(resolve => setTimeout(resolve, ms));
    }

    async function likesElementVisible() {
        while (document.querySelector('#menu-container>#menu #top-level-buttons-computed') == null
               || document.querySelector('#menu-container>#menu #top-level-buttons-computed').children == null
               || document.querySelector('#menu-container>#menu #top-level-buttons-computed').children.length < 3) {
            console.log('waiting for likes to be displayed...')
            await sleep(1000)
        }
    }

    async function displayDislikes() {
        var videoUrl = window.location.href
        var videoUrlParts = videoUrl.split('v=')
        if (videoUrlParts.length < 2) {
            console.log('not a video')
            return
        }
        var videoId = videoUrlParts[videoUrlParts.length - 1].split('&')[0]
        console.log(videoId)

        await likesElementVisible()
        var likeElement = document.querySelector('#menu-container>#menu #top-level-buttons-computed').children[0].children[0].children[1]
        var dislikeElement = document.querySelector('#menu-container>#menu #top-level-buttons-computed').children[1].children[0].children[1]

        dislikeElement.innerHTML = 'LOADING...'
        await sleep(1000)
        var strLikes = likeElement.getAttribute('aria-label')
        var likes = parseInt(strLikes.replace(',', '').split(' ')[0])

        console.log(likes)

        function formatNumber(nr) {
            var strNr = nr.toString()
            if (nr < 1000) {
                return strNr;
            }
            if (nr < 1000000) {
                return strNr.substring(0, strNr.length - 3) + 'K'
            }
            if (nr < 1000000000) {
                return strNr.substring(0, strNr.length - 6) + 'M'
            }
            return strNr.substring(0, strNr.length - 9) + 'B'
        }

        function reqListener () {
            var response = JSON.parse(this.responseText)
            console.log(response)
            dislikeElement.innerHTML = formatNumber(response.dislikes)
        }

        console.log('Requesting dislike information...')
        var oReq = new XMLHttpRequest();
        oReq.addEventListener("load", reqListener);
        oReq.open("GET", "https://returnyoutubedislikeapi.com/Votes?videoId=" + videoId + "&likeCount=" + likes);
        oReq.send();
    }


    document.addEventListener('yt-navigate-finish', function() {
        displayDislikes()
    });
})();