You’re trying to get the last row that was displayed and send that value in the AJAX? You may be going past were I can help you. If I was doing this, more than likely I would be setting a variable in JavaScript that held the current row being displayed rather than trying to get the row id from the html element.
var current_id = 0;
I’d increment or decrement this value based on what the user clicked and then send this value in my request.
I actually don’t do much with jQuery. I can help you with the ACF/PHP side of things, I’ve had some experience with AJAX, but when it comes to how to get what you need to send using jQuery what you really need is jQuery help.
