Probably a slap-my-forehead solution, but:
<div id="foo">
   <!-- this will all be replaced periodically via AJAX -->
   <p id="bar_1">click me</p>
   <p id="bar_2">click me</p>
   <p id="bar_3">click me</p>
   <!-- end AJAXed section -->
</div>
$('#foo').on(click,'p',function(){
   alert($(this).attr('id'));
   //returns "foo"
});
Clicking any p alerts "foo". How do I return "bar_n", the id of the p that was clicked?
I'm targeting the outer div because it's reliable and not going to be replaced via AJAX.  Within the .on() method, I'm targeting (subtargeting?) the inner p because that's what I really want to bind the click handler to.  All the p's will be replaced periodically, and their bindings lost, therefore, I can't simply say $('p').on(click...). Can I?
 
                        
You need to add quote here
clicklike -'click'and every thing will be fine then, fiddle already submitted by @Arun.Try this -