The following indexes can be used in methods and callback functions:

• Initial Column Index (or simply Column Index)
  Equals the column's index in the columns array.

• Visible Column Index
  Depends on the column's current location in the DataGrid and changes dynamically when columns are reordered or data is grouped.

  

  Do not confuse the visible column index with the index specified using the column.visibleIndex option. The latter is used in column reordering.

• Row Index
  Starts from 0 and increases by 1 per row including group rows. With paging, the index resets on each page.