Need help adding alphabetical sort to combobox - excel

Question

I have a combobox in an Excel UserForm that I would like to sort alphabetically. I don't have any idea how to add this function, and I would appreciate any help. Here is my VBA:
Private Sub Userform_Initialize()
' Sets range for ComboBox list
Dim rng As Range, r As Range
Set rng = Sheet1.Range("H2:H65536")
For Each r In rng
AddUnique r.value
Next r
End Sub
Sub AddUnique(value As Variant)
Dim i As Integer
Dim inList As Boolean
inList = False
With Me.ComboBox1
For i = 0 To Me.ComboBox1.ListCount - 1
If Me.ComboBox1.List(i) = value Then
inList = True
Exit For
End If
Next i
If Not inList Then
.AddItem value
End If
End With
End Sub

Answer 1

My suggestion is to use a Dictionary to create a collection of only the unique value in your range, then sort it prior to adding the items to your combobox.
If you haven't done so already, add a reference library to your project by going to the Tools menu, then select References. Scroll down the list and find the "Microsoft Scripting Runtime" and check it.
Then it's a simple matter of looping through all the entries -- only adding an item if it doesn't exist already. I lifted a sorting routine from ExcelMastery. Then add the items to your combobox.
Option Explicit
Private Sub Userform_Initialize()
' Sets range for ComboBox list
Dim rng As Range, r As Range
Set rng = Sheet1.Range("H2:H65536")
'--- create a dictionary of the items that will be in
' the combobox
Dim uniqueEntries As Object
Set uniqueEntries = New Scripting.Dictionary
For Each r In rng
'--- all dictionary keys must be a string
Dim keyString As String
If IsNumeric(r) Then
keyString = CStr(r)
Else
keyString = r
End If
If Not uniqueEntries.exists(keyString) Then
uniqueEntries.Add CStr(keyString), r
End If
Next r
Set uniqueEntries = SortDictionaryByKey(uniqueEntries)
CreateComboboxList uniqueEntries
End Sub
Private Sub CreateComboboxList(ByRef dictList As Scripting.Dictionary)
Dim key As Variant
For Each key In dictList.keys
Debug.Print "Adding " & key
'Me.combobox1.AddItem key
Next key
End Sub
'------------------------------------------------------------------
'--- you should put this in a module outside of your userform code
Public Function SortDictionaryByKey(dict As Object, _
Optional sortorder As XlSortOrder = xlAscending) As Object
'--- from ExcelMastery
' https://excelmacromastery.com/vba-dictionary/#Sorting_by_keys
Dim arrList As Object
Set arrList = CreateObject("System.Collections.ArrayList")
' Put keys in an ArrayList
Dim key As Variant, coll As New Collection
For Each key In dict
arrList.Add key
Next key
' Sort the keys
arrList.Sort
' For descending order, reverse
If sortorder = xlDescending Then
arrList.Reverse
End If
' Create new dictionary
Dim dictNew As Object
Set dictNew = CreateObject("Scripting.Dictionary")
' Read through the sorted keys and add to new dictionary
For Each key In arrList
dictNew.Add key, dict(key)
Next key
' Clean up
Set arrList = Nothing
Set dict = Nothing
' Return the new dictionary
Set SortDictionaryByKey = dictNew
End Function