Another cascading combo challenge

[Joe]

Hi -

I have a subform with two combos CboMechanism with row source = TblMechanism
and CboSubMechanism dependent on selection in CboMechanism using the
following code in CboMechanism Afer Update event...

Private Sub CboMechanism_AfterUpdate()
On Error Resume Next
Select Case CboMechanism.Value
Case "7"
CboSubMechanism.RowSource = "tbl_SubMechEquipt"
Case "9"
CboSubMechanism.RowSource = "tbl_SubMechFall"
Case "10"
CboSubMechanism.RowSource = "tbl_SubMechLift"
Case "11"
CboSubMechanism.RowSource = "tbl_SubMechParachute"
Case "14"
CboSubMechanism.RowSource = "tbl_SubMechSlip"
Case "16"
End Select
This works well when the cases are selected but does not clear
CboSubMechanism when a non-case selection is made.

I tried adding CboSubMechanism.RowSource = "tbl_SubMechMTA" in the After
Update but it doesn't really resolve the problem. I've tried requerying in
after update event without it resolving the issue.

I would be grateful for any guidance offered.

 

[Douglas J. Steele]

What do you mean by "does not clear CboSubMechanism"? Are you saying that
CboSubMechanism still has a row selected in it, or are you simply that
CboSubMechanism still has content?

To unselect from CboSubMechanism, use

Me!CboSubMechanism = Null

To ensure CboSubMechanism has no data in it, use

Me!CboSubMechanism.RowSource = vbNullString
Me!CboSubMechanism.Requery

 

[Joe]

Doug, Thanks for your help.

Using Me!CboSubMechanism = Null

1. If ‘crush’ (not one of the ‘case’ options) is selected, second combo
initially shows correct empty of options.

2. When “fall†(a ‘case’ option) is selected second combo lists options
related to ‘fall’ as required.

3. If “parachuting’ (‘case’ option’ is selected second combo properly lists
options related to “parachuting†as expected.

4. If “Stretch†(not ‘case’ option) is then selected CboSubMechanism still
retains the options for the last ‘case’ selected. No options should be
available for this selection!

When
Me!CboSubMechanism.RowSource = VbNullString
Me!CboSubMechanism.Requery
are used none of the options populate for the 'case' selections in
CboMechanism.

I'm not sure where to go from here. I've tried combinations of the above
just to eliminate that option but no go.

 

[Douglas J. Steele]

Please the entire routine as you've changed it.

 

[Joe]

Hi Doug - You are a champion!
When I reviewed the code I found that I had just appended the
Me!CboSubMechanism.RowSource = VbNullString
Me!CboSubMechanism.Requery
after the End Select. I forgot to look at what the code was actually doing -
doh!

All is well now that I have put the code at the beginning of the routine .

Many thanks for your patient help. You MVP's are always so helpful and it
is greatly appreciated.