Tryit Editor v2.9

Edit This Code:
<!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>