meu_novo_botao.user.js

// ==UserScript==
// @name        meu_novo_botao
// @namespace   http://www.eud.net.br/gmscripts
// @description Meu novo botão na tela de dashboard
// @include     http://agroup.eud.net.br/main
// @version     1
// @grant       none
// ==/UserScript==

console.log('Meu novo botão');

console.log('Iniciando');

var inserido = false;

function lookForElement(xpath) {
	var snapResults = document.evaluate(xpath,
			document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
	if (snapResults.snapshotLength > 0) return snapResults.snapshotItem(0); //return the first element
	else return false;
}

// document.addEventListener('DOMSubtreeModified', function (ev) {
// 	console.log('DOMSubtreeModified');
document.addEventListener('DOMNodeInserted', function (ev) {
	console.log('DOMNodeInserted');
	if (!inserido) {
		var elem = lookForElement('/html/body/ng-view/div/div/div[2]/div/div[2]');
		if (!!elem) {
			var newBtn = document.createElement('a');
			newBtn.classList.add('btn');
			newBtn.classList.add('btn-default');
			newBtn.setAttribute('href', '/events/new');
			newBtn.innerHTML = '+ New group';
			inserido = true;
			elem.appendChild(newBtn);
		}
		// console.log(ev);
		// if (/event/.test(ev.target) && /div.panel-body/.test(ev.relatedNode)) {
		// 	console.log('achou com relatedNode!');
		// }
		// if (/div.panel-body/.test(ev.target)) {
		// 	console.log('achou com target!');
		// }
	}
});