Twitch Chat User Highlight

Highlights messages by user, on username or @username click

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         Twitch Chat User Highlight
// @namespace    1N07
// @version      0.5
// @description  Highlights messages by user, on username or @username click
// @author       1N07
// @require      https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js
// @include      https://www.twitch.tv*
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_registerMenuCommand
// @grant        GM_unregisterMenuCommand
// @noframes
// ==/UserScript==

(function() {
    'use strict';

    var ChatList, MutUser, ChatGetInterval, AutoHighlightStopTimeout;
    const MutConf = {childList: true};
    const Observer = new MutationObserver(OnNewComment);

    var HighlightStopTimer = GM_getValue("HighlightStopTimer", 5);
    var MenuOptionRegister;
    MenuOptionRegister = GM_registerMenuCommand("Set HighlightStopTimer ("+HighlightStopTimer+")", MenuOptionRegisterFunc);
    function MenuOptionRegisterFunc()
    {
        HighlightStopTimer = prompt("Set HighlightStopTimer\nThe time it takes for the user highlighting to automatically stop after the mouse leaves the chat area.\nRe-entering the chat area resets and stops the timer.", HighlightStopTimer);
        GM_setValue("HighlightStopTimer", HighlightStopTimer);
        GM_unregisterMenuCommand(MenuOptionRegister);
        MenuOptionRegister = GM_registerMenuCommand("Set HighlightStopTimer ("+HighlightStopTimer+")", MenuOptionRegisterFunc);
    }

    addGlobalStyle(`
        .tcuh-highlighted {
            border: rgba(255,255,255,0.5) 2px solid;
            background: rgba(255,255,255,0.15);
        }
        .chat-line__message-mention, .mention-fragment, .mentioning
        {
            cursor: pointer;
            font-weight: 700;
        }
    `);


    var lastCheckedUrl = window.location.href;
    OnPageLoad();

    setInterval(() => {
        if(lastCheckedUrl != window.location.href)
        {
            lastCheckedUrl = window.location.href;
            OnPageLoad();
        }
    }, 200);


    function OnPageLoad()
    {
        Initialize();
        AfterChatIsAvailable(() => {
            StartClickListener();
        });
    }





    function Initialize()
    {
        if(ChatGetInterval)
            clearInterval(ChatGetInterval);

        if(ChatList && ChatList.length > 0)
            ChatList.off();

        MutUser = ChatList = ChatGetInterval = null;
        StopHighlightingUsers();
    }

    function AfterChatIsAvailable(callback)
    {
        ChatGetInterval = setInterval(() => {
            ChatList = $(".chat-scrollable-area__message-container"); //Live vanilla & FFZ
            if(ChatList.length <= 0) ChatList = $("div.video-chat__message-list-wrapper > div > ul"); //VODs vanilla & FFZ

            if(ChatList.length > 0)
            {
                callback();
                clearInterval(ChatGetInterval);
            }
        }, 50);
    }

    function StartClickListener()
    {
        //post author
        ChatList.on("click", ".video-chat__message-author, .chat-line__username", function(e){ //VODs vanilla & FFZ, Live vanilla & FFZ
            e.preventDefault();
            e.stopPropagation();

            let user = $(this).find(".chat-author__display-name[data-a-user]"); //Live & VODs vanilla
            if(user.length == 0) user = $(this).closest(".chat-line__message[data-user]"); //Live FFZ
            if(user.length == 0) user = $(this).find(".chat-author__display-name"); //VODs FFZ

            user = user.data("aUser") || user.data("user") || user.parent().parent().data("user"); //Live & VODs vanilla || Live FFZ || VODs FFZ

            StartHighlightingUser(user);
        });
        //@
        ChatList.on("click", ".chat-line__message-mention, .mention-fragment, .mentioning", function(e){ //Live & VODs FFZ, Live & VODs vanilla, ?
            e.preventDefault();
            e.stopPropagation();
            let user = $(this).data("login") || $(this).text().replace("@", "").toLowerCase(); //Live & VODs FFZ || Live & VODs vanilla
            StartHighlightingUser(user);
        });
    }

    function StartHighlightingUser(user)
    {
        if(user && user.length > 0)
        {
            StopHighlightingUsers(false);
            if(user == MutUser)
                MutUser = null;
            else
            {
                MutUser = user;

                let targets = ChatList.find(".chat-line__message .chat-author__display-name[data-a-user='"+MutUser+"']"); //Live vanilla
                if(targets.length > 0)
                {
                    targets.each(function(e){
                        $(this).closest(".chat-line__message").addClass("tcuh-highlighted");
                    });
                }
                else
                {
                    targets = ChatList.find(".chat-line__message[data-user='"+MutUser+"']"); //Live FFZ
                    if(targets.length > 0)
                    {
                        targets.each(function(e){
                            $(this).addClass("tcuh-highlighted");
                        });
                    }
                    else
                    {
                        targets = ChatList.find(".vod-message .chat-author__display-name[data-a-user='"+MutUser+"'], .vod-message [data-user='"+MutUser+"']"); //VODs vanilla & FFZ
                        if(targets.length > 0)
                        {
                            targets.each(function(e){
                                let target = $(this).closest(".vod-message").parent().addClass("tcuh-highlighted");
                            });
                        }
                    }
                }

                Observer.observe(ChatList[0], MutConf);

                if(HighlightStopTimer != 0)
                {
                    $(".chat-shell").off();
                    $(".chat-shell").mouseenter(function(){
                        clearTimeout(AutoHighlightStopTimeout);
                    });
                    $(".chat-shell").mouseleave(function(){
                        StartHighlightAutoStopTimer();
                    });
                }
            }
        }
    }

    function StartHighlightAutoStopTimer()
    {
        clearTimeout(AutoHighlightStopTimeout);
        AutoHighlightStopTimeout = setTimeout(StopHighlightingUsers, HighlightStopTimer * 1000);
    }

    function StopHighlightingUsers(alsoClearMutUser = true)
    {
        if(alsoClearMutUser)
            MutUser = null;
        $(".tcuh-highlighted").removeClass("tcuh-highlighted");
        Observer.disconnect();
    }

    function OnNewComment(mutationsList, observer)
    {
        for(let i = 0; i < mutationsList.length; i++)
        {
            if(mutationsList[i].type == 'childList' && mutationsList[i].addedNodes.length > 0)
            {
                for(let j = 0; j < mutationsList[i].addedNodes.length; j++)
                {
                    if($(mutationsList[i].addedNodes[j]).find(".chat-author__display-name[data-a-user='"+MutUser+"']").length > 0 || //Live vanilla
                       $(mutationsList[i].addedNodes[j]).find(".vod-message .chat-author__display-name[data-a-user='"+MutUser+"']").length > 0 || //VODs vanilla
                       $(mutationsList[i].addedNodes[j]).find(".vod-message [data-user='"+MutUser+"']").length > 0 || //VODs FFZ
                       $(mutationsList[i].addedNodes[j]).data("user") == MutUser) //Live FFZ
                    {
                        $(mutationsList[i].addedNodes[j]).addClass("tcuh-highlighted");
                    }
                }
            }
        }
    }

    function addGlobalStyle(css)
    {
        var head, style;
        head = document.getElementsByTagName('head')[0];
        if (!head) { return; }
        style = document.createElement('style');
        style.type = 'text/css';
        style.innerHTML = css;
        head.appendChild(style);
    }

})();