Deselect Selecteditem in a Listbox

[ghislain]

Hello!

I'm still working on my selection form..
Which has got a listbox. When nothing is selected the selectedindex = -1.
Now when i select something i can't deselect it anymore..
So I made up this deselect button with the following click-event:

myListbox.selectedIndex = -1

But this produces an [runtime] error everytime.
Does anybody have a suggestion?

Ghislain

[Erel]

Try to remove the selected item and then insert it again.

[Cableguy]

If You don't require multiple selections then a radio button should be best for you....Check this code:

[specci48]

Hi ghislain,

if I want to give the user the chance to deselect a listbox entry I'll do the following:
I add a "dummy"-entry at the first (or last) position of the listbox named "<no selection>" (or something like that) and pre-select this entry before showing the listbox.
Now you can proof during runtime, if the first (or last) entry is selected, which means, nothing is selected ...


specci48

[ghislain]

Thanks for all the replies.
For the time being I will just refill my listbox. Which does the same trick as well. But it might become too slow when my list becomes longer and longer..
I hope in the future the functionality to deselect-all will be implemented..
Thanks!

[Cableguy]

Have you tryied to set the index to -1?
That is , at least i think it is, the start point of any un-selected index..

[Big JR]

Ghislain started off setting the index to -1 but, as mentioned, that gives a runtime error. If you trap that error with an empty error handler you'll get the deselection without the error being reported.

Sub EventsList_LostFocus
ErrorLabel(ErrHandler)
EventsList.SelectedIndex = -1
return
ErrHandler:
End Sub

If your deselection comes within other code you'll need to have a goto to just after the selectedindex = -1 code.