<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("p").on("custom.someNamespace",function(event){
alert(event.namespace);
});
$("p").click(function(event){
$(this).trigger("custom.someNamespace");
});
$("button").click(function(){
$("p").off("custom.someNamespace");
});
});
</script>
</head>
<body>
<p>Click on this paragraph.</p>
<button>Remove namespace</button>
</body>
</html>