Send value from view to method and vice versa

I think you need AJAX to do this.
Insert a link to the latest Jquery library in the 'head' section of your view (or template).
Jquery makes life a lot easier when it comes to implementing AJAX.

At the bottom of your view, create a script that sends an AJAX-request to the controller (with the current value), and get the new value back.
Jquery can replace the old value by the new value on the fly.