Set calculated value in Textbox

Hello,

I have a textbox in which I defined the value of a calculated field using JavaScript. Here is the JS Code:

NWF$(document).ready(function(){
   NWF$('#' + CenCouVal).change(function(){
      var selection = NWF$('#' + CenCouVal);
      NWF$('#' + varText).val(selection.val());
   });
});

CenCouVal represents the client ID JavaScript variable name of the calculated value.

varText represents the client ID JavaScript variable name of the textbox.

This textbox is located in a Repeating Section in which I have defined 3 rows by default (see picture below). Can someone tell me how I can put the textbox value in the red box in the first row ? Is it also possible to set this value in all textboxes on this column ? Thanks