ListIndex error 7777 You've used the ListIndex property incorrectly

I am trying to running the following code, to select the list box value where there is only one item in the list. However I keep getting the error "7777 You've used the ListIndex property incorrectly". I have observed the following points.

1. I have SetFocus to the control that I have tried set the value for.
2. I have tried to use the selListBox.Selected(0) method, but keep getting the "Object deosn't support this property or method"
3. The selListBox is passed as a variant because it is passed from a collection. I have changed this to selListBox as ListBox - but the same error occurs.
4. Although the error message ""7777 You've used the ListIndex property incorrectly" occurs,  the correct list box item does get selected.

I am using Access 2003. Any suggestions? Thanks
Function SelectOneListItem(selListBox As Variant)
 
If selListBox.ListIndex = -1 Then
    If selListBox.ListCount = 1 Then selListBox.SetFocus: selListBox.ListIndex = 0: selListBox.Selected(0) = True
 
End If
End Function

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HeronandBrearleyAsked:
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rockiroadsConnect With a Mentor Commented:
Not sure why u need to check the ListIndex
You can use IemData to refer to the first item

Function SelectOneListItem(selListBox As Variant)
 
    If selListBox.ListCount = 1 Then
        selListBox.SetFocus
        selListBox.value = selListBox.itemdata(0)
    End If
End Function

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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
don't use ListIndex; just set the value directly:

selListBox = 0

the Selected method expects a True or False:

selListbox.Selected(0) = True

And I'd encourage you to avoid the colon method of code; place each of your statements on a individual line. It's MUCH easier to read, and will be much appreciated by any developer who comes behind you to work on your app (or by yourself when you must make changes 6 months from now). it's difficult to scan through code and find what you're looking for with code constructed in this manner.
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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
Also, the correct item is "selected" since you're setting the focus to the listbox, which will select the FIRST item (i.e. the 0 item).
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HeronandBrearleyAuthor Commented:
LSMConsulting:

Thanks for the response - after all the swapping and changing code to check if various methods work, I have copied the worng code into my question. - Sorry. In fact my code is:

Function SelectOneListItem(selListBox As Variant)
If selListBox.ListIndex = -1 Then
    If selListBox.ListCount = 1 Then
        selListBox.SetFocus
        selListBox.Selected(0) = True
    End If
End If
End Function

However, I still get : "Object deosn't support this property or method".

Rockiroads:

I have used your selListBox.value = selListBox.itemdata(0) and it works. Seems obvious, now you've said it. Thanks.
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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
rocki's method will work, of course.
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rockiroadsCommented:
With your current code, it would probably work if defined as a listbox

Function SelectOneListItem(selListBox As ListBox)
If selListBox.ListIndex = -1 Then
    If selListBox.ListCount = 1 Then
        selListBox.SetFocus
        selListBox.Selected(0) = True
    End If
End If
End Function
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rockiroadsCommented:
One thing I forgot to add, and the reason why I prefer to use itemdata, is that I dont believe selected sets the listbox value, it just merely highlights an entry. Use of itemdata in setting the value sets both the value and selects item
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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
Yes, the Selected property simply selects that item. Of course, at that point the Listbox would return whatever value is in the bound column for that listbox. IOW, if I select item 2, the listbox would be "set" to whatever value is in the ItemData for Item 2.
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