Excel VBA combobox doesn't allow to select specific items from list - vba

Question

I have a combobox in my worksheet with a dynamic search, the dynamic search is done by searching the typed letters in a list that is on another worksheet. The search is done by excel formulas. The list is a defined range and then the combobox listfillrange is set to the named range.
When I type the dropdown list opens, for certain items the combobox allows me to select from the list and for others the selection disappear as I select. I tried figure why do these items disappear. The list is long (10,000 items) so it kind of works slow, but I am not sure if this is the problem.
How can I fix such a problem? Is there a way to define a variable for the mouseclick selection from dropdown list?
Thanks in advance,
Tali
This is my code:
Private Sub ComboBox1_Change()
Sheets("PS").EnableCalculation = True
ComboBox1.ListFillRange = "DropDownList"
ComboBox1.DropDown
End Sub
Private Sub CommandButton21_Click()
Dim PS As Worksheet
Application.ScreenUpdating = False
Application.ErrorCheckingOptions.BackgroundChecking = False
Sheets("PharmaSoft").Select
Set PS = Sheets("PS")
SelectionA = PS.Range("J2").Value
If ComboBox1.Value = SelectionA Then
Range("J19") = "Pharmacy purchase price"
Range("N19") = PS.Range("K2")
Range("O19") = "ILS"
Range("J21") = "Pharmacy selling price Incl.VAT"
Range("N21") = PS.Range("L2")
Range("O21") = "ILS"
Range("J23") = "Package size"
Range("N23") = PS.Range("M2")
Range("J19:O23").Select
With Selection.Font
.ThemeColor = xlThemeColorDark1
.TintAndShade = 0
End With
Selection.Font.Bold = True
Application.ScreenUpdating = True
Range("N19").Errors.Item(1).Ignore = True
Range("N21").Errors.Item(1).Ignore = True
Range("N23").Errors.Item(1).Ignore = True
Else
MsgBox "Please select a product", vbCritical, "Error"
End If
Sheets("PS").EnableCalculation = False
End Sub
Private Sub CommandButton22_Click()
Application.ScreenUpdating = False
Sheets("PharmaSoft").Select
ComboBox1.Value = Null
Range("J19:O23").Value = Null
Application.ScreenUpdating = True
End Sub
Also the code for the workbook:
Private Sub Workbook_Open()
Sheets("PharmaSoft").Select
Application.ScreenUpdating = False
Sheets("PharmaSoft").ComboBox1.Value = Null
Range("J19:O23").Value = Null
Application.ScreenUpdating = True
End Sub

Answer 1

Although I can't comment on what you're doing given that your search is done as you mention with excel formulas. I do know that using data validation via a combo box can be pretty quick. The method I use is as per this page and is extremely fast. It's pretty much instantaneous on a validation range that is about 15k rows long. The best part about it is that it provides auto completion. So when you type in the combo box and that value isn't in the list, the entry that matched one character ago disappears. It's a good visual cue whether you're selection is valid or not. And of course, you can still use the drop down box in the usual way. The only down side is that, as coded at the link provided, you have to double-click to enter the auto-completion mode.