Next_Arrow_Keys_for_heise_select.user.js

// ==UserScript==
// @name         Next/Forward Page for heise select
// @version      0.3
// @description  Press Left/Right arrow key for previous/next page
// @author       Kuermel
// @match        https://www.heise.de/select/*
// ==/UserScript==

document.onkeydown = checkKey;

function checkKey(e) {

    e = e || window.event;

    if (e.keyCode == '37' || e.keyCode == '65') {
	document.getElementsByClassName("nav__link nav__link--prev")[0].click();
       // left arrow or a
    }
    else if (e.keyCode == '39' || e.keyCode == '68') {
	document.getElementsByClassName("nav__link nav__link--next")[0].click();
       // right arrow or d
    }
    else if (e.keyCode == '87') {
        window.scrollBy({
            "behavior": "smooth",
            "left": 0,
            "top": -50
        });
       // w
    }
    else if (e.keyCode == '83') {
        window.scrollBy({
            "behavior": "smooth",
            "left": 0,
            "top": 50
        });
       // s
    }

}