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Sun's Global Chat

I'm A Description Made By Sun

// ==UserScript==
// @name         Sun's Global Chat
// @namespace    http://tampermonkey.net/
// @version      1
// @description  I'm A Description Made By Sun
// @author       Sun
// @match        http://zombs.io/
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Your code here...
})();

const $ = function(className) {
    var elem = document.getElementsByClassName(className);
    if (elem.length > 1) return elem;
    return elem[0];
};
window.addEventListener("load", function(e) {
    var chat = $("hud-chat");
    var html = `<div class='GLB'>
                   <button style='opacity: 0; transition: opacity 0.15s ease-in-out;' class='GLBbtn'>Send it as global message...</button>
                </div>`;
    chat.insertAdjacentHTML("afterend", html);
    var sendBtn = $("GLBbtn");
    sendBtn.addEventListener("click", function(e) {
        let msg = $("hud-chat-input").value;
        Game.currentGame.network.sendRpc({
            name: "SendChatMessage",
            channel: "Global",
            message: msg
        });
    });
    var input = document.querySelectorAll(".hud-chat")[0];
    var observer = new MutationObserver(styleChangedCallback);

    function styleChangedCallback(mutations) {
        var newIndex = mutations[0].target.className;

        if (newIndex == "hud-chat is-focused") {
            sendBtn.style.opacity = 1;
        } else {
            sendBtn.style.opacity = 0;
        }
    }
    observer.observe(input, {
        attributes: true,
        attributeFilter: ["class"]
    });
});