Avoid submitting a form and focus next available input in a form on enter key

nextInputOnEnter.js

	document.addEventListener('keydown', function(){
		if (event.keyCode === 13 && event.target.nodeName !== 'TEXTAREA') {
			let form = event.target.closest('form');
			if (form) {
				event.preventDefault();
				let startingNode = event.target.nextElementSibling || event.target.parentElement.nextElementSibling; // will break if final?
				let foundStart = false;
				function onlyInputs(node) {
					if (!foundStart && node !== startingNode) return NodeFilter.FILTER_REJECT;
					else foundStart = true;
					if (node.offsetHeight === 0 && node.offsetWidth === 0) return NodeFilter.FILTER_REJECT;
					// node.querySelector('input, textarea, select');
					let found = ['INPUT', 'TEXTAREA', 'SELECT'].includes(node.nodeName) && node.type !== 'hidden';
					return found ? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_REJECT;
				}
				let nodeIterator = document.createNodeIterator(form, 1, onlyInputs);
				nodeIterator.nextNode().focus();
			}
		}
	});