Use the jQuery on() method.

Example:

HTML:

<!DOCTYPE html>
<html>
	<head>
		<script type="text/javascript" src="lib/jquery-3.4.1.min.js" defer></script>
		<script type="text/javascript" src="js/index.js" defer></script>
	</head>
	<body>
		<div id="append"></div>
	</body>
</html>

JS:

$('#append').append('<a href="#" class="apendTest">Test</a>');
$('#append').on('click', '.apendTest', function() {
	alert("test")
})