Ajax request using site_url not working

Thanks everyone. For those asking about the e variable. The only difference between my example that works and my example that doesn't work is the url variable. So everything in the controller must be ok.

It's in a js file so that must be the problem. The view has a php extension but that loads this code in a separate js file. I only have a couple of hours each morning to work on this so I'll check it out your suggestions tomorrow. Thanks again.