GC Keyboard Shop Browser

Allows ArrowKey, WASD, and NumPad shop browsing. The first shop item will automatically be focused, then the arrow keys, WASD, or 8426 (for NumPads) will navigate between items.

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// ==UserScript==
// @name         GC Keyboard Shop Browser
// @namespace    https://www.grundos.cafe/userlookup/?user=hazr
// @version      1.0
// @description  Allows ArrowKey, WASD, and NumPad shop browsing. The first shop item will automatically be focused, then the arrow keys, WASD, or 8426 (for NumPads) will navigate between items.
// @author       hazr
// @license      MIT
// @match        https://www.grundos.cafe/viewshop/*
// @match        https://www.grundos.cafe/market/browseshop/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=grundos.cafe
// @grant        none
// @run-at       document-start
// ==/UserScript==

var items = [];
var selectedItem = 0;
var maxIndex = 0;
var loaded = false;

new MutationObserver(function(mutations)
                     {
    items = document.querySelectorAll('#searchedItem form > input[type="image"], #shopInventory form > input[type="image"]');
    if (items)
    {
        items[0].focus();
        selectedItem = 0;
        maxIndex = items.length - 1;
        loaded = true;

        this.disconnect();
    }
}).observe(document, {childList: true, subtree: true});

(function() {
    'use strict';

    // Listen for keydown events
    document.addEventListener('keydown', function(event) {
        if (!loaded || maxIndex < 0 || document.activeElement.attributes.getNamedItem("type")?.value == "text") return;
        switch(event.key) {
            case "ArrowLeft":
            case "a":
            case "4":
                if ((selectedItem -= 1) < 0) selectedItem = 0;
                items[selectedItem].focus();
                break;
            case "ArrowRight":
            case "d":
            case "6":
                if ((selectedItem += 1) > maxIndex) selectedItem = maxIndex;
                items[selectedItem].focus();
                break;
            case "ArrowUp":
            case "w":
            case "8":
                if ((selectedItem -= 4) < 0) selectedItem = 0;
                items[selectedItem].focus();
                break;
            case "ArrowDown":
            case "s":
            case "2":
                if ((selectedItem += 4) > maxIndex) selectedItem = maxIndex;
                items[selectedItem].focus();
                break;
        }
    });
})();