edit and update datagrid

i have created a datagrid and editing the grid without using edittemplate.i am allowing the user to edit only one row.now i want to the index for that particular cell which has been edited to make furthur calculation.how can i get the cell index.

Try this code if you can use this for finding changed cell indexes.
In code changed cell is shown in window status bar.
You may save them in 2 dimensional array.

obj.onSelectedChanged = function(){ window.status = "selected: " + this.getSelectedColumns() + " " + this.getSelectedRows()};