JFBCRecommendation

I'm assuming you mean the Requests feature, not recommendations. Right now, JFBConnect doesn't have a way to prevent sending the same request to certain users. To change would take a lot of changes, but I don't know all of the details.

Mainly, you'd need to get the Facebook User IDs that have already received the request from the xyz_jfbconnect_request_notifications table. Once you get those dynamically, you'll need to create a Javascript variable on the page which is used in the components/com_jfbconnect/includes/jfbconnect.js file. Specifically, in the jfbc.requests.popup function, you can add an exclude_ids parameter to the FB.ui call. For more information on the exclude_ids parameter, see the Facebook documentation:
developers.facebook.com/docs/reference/dialogs/requests/

I hope that description helps get you started, but it will take a bit of work to get going. Additionally, the feature you ask for is something we have plans to add, likely in the 5.0 release late this year. If you implement the feature before then, let us know how it goes.

Best of luck,
Alex

Yes, it's a complicated thing that you're asking for and not as simply as one or 2 lines of code. If so, we'd be more than happy to investigate and provide the answer right now. We do have the investigation planned for later this year with an upcoming release, so you can wait for that release in a few months or try to get it going now on your own. Certainly if you run into issues, we can try to help guide you as necessary, but we won't be able to implement or test it for you now.

Best of luck,
Alex

Glad to hear you figured out what you were trying to do. If you want to share your solution, or if you have any other questions we can help with, just let us know!

Thanks,
Alex