picks random anime/manga from your MAL animelist/mangalist pages

MALrandom.js

// ==UserScript==
// @name         MAL random
// @version      3
// @description  picks random anime/manga from your MAL animelist/mangalist pages
// @author       IA21
// @match        https://myanimelist.net/mangalist/*
// @match        https://myanimelist.net/animelist/*
// @grant        none
// ==/UserScript==

// reference: http://stackoverflow.com/a/1527820/6179686
function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

(function() {
    'use strict';

    var container = document.createElement("div");
    var randButton = document.createElement("span");
    var randHighButton = document.createElement("span");

    randButton.innerHTML = "random (all)";
    randHighButton.innerHTML = "random (only high priority)";

    randButton.style.marginLeft = "15px";
    randHighButton.style.marginLeft = "15px";

    randButton.style.cursor = "pointer";
    randHighButton.style.cursor = "pointer";

    container.style.color = "white";
    container.style.lineHeight = "38px";
    container.style.position = "absolute";

    container.appendChild(randButton);
    container.appendChild(randHighButton);

    var text = document.getElementsByClassName("text")[10];
    document.getElementsByClassName("list-status-title")[0].insertBefore(container, text);

    randButton.onclick = function() {
        var titleList = document.getElementsByClassName("link sort");
        var e = titleList[getRandomInt(0, titleList.length)];
        e.target = "_blank";
        e.click();
    };

    randHighButton.onclick = function() {
        var theChosenOnes = [], list = document.getElementsByClassName("list-item");

        for (var i = 0 ; i < list.length ; i++)
            if(list[i].getElementsByClassName("data priority")[0].innerText == "High")
                theChosenOnes.push(list[i].children[0].children[3].children[0]);

        if(theChosenOnes.length !== 0)
        {
            var e = theChosenOnes[getRandomInt(0, theChosenOnes.length)];
            e.target = "_blank";
            e.click();
        }
        else if(theChosenOnes.length === 0)
            alert("No High Priority Entry Found");
    };

})();