How to get Javascript execution result in Codeigniter?

Question

CodeIgniter

Good evening. There was a task to process some data, the decision was found by means of JavaScript. But there was a small problem, after processing, you need to return the data back to the controller, how can this be implemented?
First of all, the controller is loaded, then we pull out information from the database, load it into a huge array, send it to the view, and process the information in the form using JavaScript.
Please don't write me about the $this->load->view("page.php", $data, TRUE) construct, this construct will display all the code on the page, but I only need to get the result.
Thank you.