radGrid - check if there was a row selected, before selecting another one.

Okay, we had the radGrid with AllowMultiRowSelection property turned off.
But we needed to check if there is already a selection in the grid (on the client side), then get the item and do some calculations.

So far so good.
But it appeared that it is very difficult to get the previous item selected in a grid when selecting a new one.

The OnRowSelected event as you may suspect is raised too late in order to get this information as the selection is already changed.
So I thought the OnRowSelecting event will be the best time to perform this.

Guess what? It wasn't. At least for me.
Each time I checked the

sender.MasterTableView.get_selectedItems().length > 0

The statement evaluated to false (which means to me that when the OnRowSelecting event is raised AFTER the selection is Clear()).

So I found a workaround to help myself persist the previous selected item of the grid:

var lastRow = null;

function RowDeselected(sender, eventArgs) {
lastRow = sender;
}

function RowSelecting(sender, eventArgs) {
if (lastRow) {
     // There was a selection before we try to select. Do whatever you need here.
}
     else {
     // There wasn't any selected item, this is the first one.
     }
}

To me it seems that problems may arise. I will test some more to see for side effects and will report back.


Any comments are appreciated.