Coldfusion 11 update 3 fixed the cfgrid javascript binding issue.(bug number 3712909,3712885)
Prior to this, js binding was broken where as CFC binding as well as URL binding were wroking properly.
As a result pagination, dynamic binding etc were not working if js binding was used though basic static grid was working properly.
Even query columns were not getting mapped to their associated grid columns.
This had happened due to our internal upgrade of EXTJS framework which did not support js binding.
So we had to write a custom js binding wrapper to make it work in coldfusion. Now everything works fine in JS binding