mainWindow.html

<!DOCTYPE html>
<html lang = "en">
<head>

	<title>Shopping List</title>
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0-beta/css/materialize.min.css">
</head>

<body>

	<nav>
		
		<div class = "nav-wrapper">
		
			<a class = "brand-logo center">Shopping List</a>
		</div>
	</nav>
	
	<ul></ul>
	
	<script>
	
		const electron = require('electron');
		const {ipcRenderer} = electron;
		const ul = document.querySelector('ul');
		
		//	Add item
		ipcRenderer.on('item:add', function(e, item) {
		
			ul.className = 'collection';
			//console.log(item);
			const li = document.createElement('li');
			li.className = 'collection-item';
			const itemText = document.createTextNode(item);
			li.appendChild(itemText);
			ul.appendChild(li);
		});
		
		//	Clear item
		ipcRenderer.on('item:clear', function(e) {
		
			//console.log(item);
			ul.innerHTML = '';
			ul.className = '';
		});
		
		//	Remove item
		ul.addEventListener('dblclick', removeItem);
		
		function removeItem(e) {
			
			e.target.remove();
			if (ul.children.length == 0) {
			
				ul.className = '';
			}
		}
	</script>
</body>
</html>