Updating hidden fields

Hey guys, firstly big up for the awesome plugin!

I have been searching the forums a bit, but can't find anything quite like this:

I have 2 hidden fields to use for filtering and it works great, the only problem is I need top update the data in them after a action. So in one of my fields I have a AJAX call to update data, but I do not reload the datatable. After the update takes place I need to update my hidden field with the updated information so when I filter again it filters on the updated field.

Tell me if you need some code, I would post it now, but there is a lot of code.

Thanks