Hello - What's the most elegant way to avoid duplicate event handler bindings in jQuery?

 

For example, for a ddl named "myDdl" a basic handler might look something like this:

 

$('#myDdl').change(function(){ alert('myDdl changed');});

 

I have a scenario where duplicate handlers are getting added for myDdl.

 

So what's the most elegant guard clause I can use to avoid this?