humblebundle.js

// ==UserScript==
// @name         Huble Bundle Books
// @namespace    http://brodul.org
// @version      0.1
// @description  Downloads books in a format from huble bundle
// @author       Andraz Brodnik brodul
// @match        https://www.humblebundle.com/*
// @grant        GM_download
// @run-at document-idle
// ==/UserScript==

(function() {
    'use strict';
    function getElementByXpath(path) {
        return document.evaluate(path, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
    }
     // wait until the select element appears
     var checkExist = setInterval(function() {
         if (document.getElementById("switch-platform")) {
             clearInterval(checkExist);
             main()
         }
     }, 100);

    // main function
    function main() {
        var platformSelect = document.getElementById("switch-platform");
        platformSelect.addEventListener("change", (e) => {
            var selectedOption = e.target.options[e.target.selectedIndex].value;
            if (selectedOption === "ebook") {
                render();
            } else {
                remove();
            }
        });
    }

    function render() {
        let el = document.createElement("div");
        var downLoadAll = document.createElement("h4");
        downLoadAll.innerHTML = "DOWNLOAD ALL";
        el.className = "container"
        el.id = "tmp";
        el.style.cursor = "pointer";
        el.appendChild(downLoadAll);
        el.addEventListener("click", download);
        document.getElementsByClassName("header")[0].appendChild(el);
    }
    function remove() {
        document.getElementById("tmp").remove();
    }
    function download() {
        var books = document.getElementsByClassName("column subproducts-holder js-subproducts-holder")[0];
        Array.from(books.children).forEach( (el, i) => {
            setTimeout(() => {
                el.click();
                setTimeout(() => getElementByXpath("//h4[contains(text(),'MOBI')]/..").click(), 1000);
                setTimeout(() => getElementByXpath("//h4[contains(text(),'EPUB')]/..").click(), 3000);
                // setTimeout(() => getElementByXpath("//h4[contains(text(),'PDF')]/..").click(), 4000);
            }, 15000*i);
        });
        // console.log(books);
    }
})();