Angularjs ng-grid : rowItem.rowIndex not map to the index of data array after sorting. (with solution)

I found that the rowIndex will no longer map to the index of the data array if sorting is applied.

demo here: http://plnkr.co/edit/irVXdjAoCvAKPxQ1uD4P?p=preview

Lastly, I found a way to locate the index of data array even after sorting is applied by using rowMap and the syntax like this:

$scope.gridOptions.ngGrid.rowMap.indexOf(rowItem.rowIndex);

instead of just using rowItem.rowIndex.

however, this is not officially documented. 

So, beware that there is any changes in the future updates/patches of the ng-grid. 

updated on 05 Feb 2014

With further studies, I found that selectedItems may serves the same purpose only when the multiSelect equals to false. So, it won't work exactly the same if you require the grid with multiSelect:true.