TableView: selectedRowKey=" %=selected% " fails when null

Question

Hello,
having a HTMLB:TableView and the key column being PersNo (a NumC 8) it is not possible to define an unselected state for my table view when using the selectedRowKey attribute:
selectedRowKey="0" or selectedRowKey="00000000"
works fine, but as soon as this is a variable of the same type as the key column
selectedRowKey="<%=selected%>"
is get an exception claiming that the key value does not exists.
Yes, and this is right, because there may be initial states where the selected row is not defined. If the "selected" thingy is filled with an existing key, it works fine.
Of course cannot simply alternate using an inline IF cos that is not possible within attributes and leads to compiler error when doing an IF-ELSE-ENDIF around the entire htmlb:tableView element (not well-formed; tag must be closed) - one that contains selectedRowKey and one one not; depending on an initial "selected".
Any ideas why using a variable fails but not specifying  the same value manually in HTMLB? Or better: what is the solution to get it working for me?
Thanks and regards,
Timo

Answer 1

Hello Durairaj,
Yes, that was the solution. I played with the leading zeros before but forgot that the NumC will revert to its defaults.
So, I now use a String that I fork in the frontend:
if the passed NumC is greater than 0 I move it over, otherwise, I manually set '0'.
That works, although it is interesting to see that the selectedRowKey var I use is of the same type as the tables key column type
Thanks all!
Regards,
Timo