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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.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>