How to display the success of adding a comment above the form when adding?

Question

CodeIgniter

There are 2 methods in the posts controller,
1 view
method 2 comments method
In 1 method, the logic for displaying the publication and comments to it
In the 2 method, adding a comment (I load a new view, where I write that the comment has been added)
I need to display that the comment was added not in new form, but in the same one where I created the comment. And then some kind of derevnya turns out ... How to do it?