//Interactive grid /Dynamic Actions/ Execute JavaScript

var widget = apex.region('emp').widget();
var grid = widget.interactiveGrid('getViews','grid');
var model = grid.model;
var selRecs     = grid.view$.grid("getSelectedRecords");  
  
selRecs.forEach(function(r) {  
                model.setValue(r,"COMM",model.getValue(r,"SAL"));  
        }  
);