A basic user script to enable html5 notifications on zendesk sites when there are incoming chat requests

zendesk-chat-notifications.user.js

// ==UserScript==
// @name           Desktop Notifications for zendesk
// @include        https://*.zendesk.com/agent/*
// ==/UserScript==

setTimeout(function () {
    var initNotifications = window.webkitNotifications ? function () {
        var notify = window.webkitNotifications;

        var n = null;
        function createNotification() {
            n = notify.createNotification("", "Pending chat requests", "Someone wants to chat with us. HELP THEM!!!");
            n.onclose = createNotification;
        }
        
        var invites = document.getElementById("chat-invites");
        if (invites && notify.checkPermission() == 0) createNotification();

        var watching = false;
        var watch = function () {
            if (n && invites) {
                invites.children.length > 0 ? n.show() : n.close();
                setTimeout(watch, 500);
            }
        };
        
        if (notify.checkPermission() == 0) {
            watch();
        } else {
            document.body.addEventListener("click", function () {
                if (notify.checkPermission() == 0) {
                    if (!watching) {
                        watching = true;
                        initNotifications();
                    }
                } else {
                    notify.requestPermission();
                }
            }, false);
        }
    } : function () {};
    initNotifications();
}, 10000);