adds button to consume Tiger's Eye Dew at the end of battle

fv_energy.user.js

// ==UserScript==
// @name         FV ENERGY! It's EXTREME!!!
// @version      1.2
// @description  become a Kyle
// @author       msjanny
// @match        https://www.furvilla.com/career/warrior/*
// @grant       GM_addStyle
// ==/UserScript==

(function() {
    'use strict';
    /* globals $:false */
    $(document).ready(function(){
        let url = window.location.href;
        let isBattle = window.location.href.indexOf("battle") !== -1;
        let id = isBattle ? url.split('/')[6] : url.split('/')[5];
        let dewBtn = $('<a href="#" class="btn"><img src="https://www.furvilla.com/img/items/4/4275-tigers-eye-dew.png" height="30">ENERGY!</a>').click(function() {
            //open modal
            $('#modal').modal('show');
            $.get("https://www.furvilla.com/use/tiger-dew/4275", function(data) {
                $('#modal .modal-content').html(data.content);
                //select currect warrior from dropdown
                $(`option[value="${id}"]`).attr("selected", "selected");
            });
        });
        //only add the wax fangs if the active villager matches the current warrior
        if ($(".right-column .villager-avatar a").eq(0).attr("href").split('/')[4] == id) {
            let fangsBtn = $('<a href="#" class="btn"><img src="https://www.furvilla.com/img/items/3/3843-wax-fangs.png" height="30">:K</a>').click(function() {
                //open modal
                $('#modal').modal('show');
                $.get("https://www.furvilla.com/use/candy/wax-fangs", function(data) {
                    $('#modal .modal-content').html(data.content);
                });
            });
            isBattle ? $(".battle-complete > p").prepend(fangsBtn) : $(".registration-well > .row.text-center").append(fangsBtn);
            fangsBtn.clone(true).appendTo($(".modal-dialog"));
        }
        // add to page
        isBattle ? $(".battle-complete > p").prepend(dewBtn): $(".registration-well > .row.text-center").append(dewBtn);
        dewBtn.clone(true).insertAfter($(".modal-content"));
        $("<style type='text/css'>.modal-dialog > .btn { margin-top: 80px; z-index: 2050; position: relative; }</style>").appendTo("head");
    });
})();