(Excel VBA) How to Show AutoComplete Feature of a ComboBox as a DropDown List - vba

Question

I would like the following code to add values to a combobox, then when the user inputs characters into the combobox, the dropdown feature of the combobox will show only those items which contain those characters, similarly to the way the Google Search Bar works.
(source: intersites.com)
Code Edit:
Option Explicit
Option Compare Text
Public LC As Long
Public Count As Integer
Dim ComboArray() As String
'Initializes the userform, and saves values from database into an array
Private Sub UserForm_Initialize()
LC = Cells(1, Columns.Count).End(xlToLeft).Column
ReDim ComboArray(1 To LC)
For Count = 1 To LC
ComboArray(Count) = Cells(1, Count).Value
Next Count
End Sub
'Prevents changes if the down key is pressed?
Private Sub ComboBox_SiteName_KeyDown(ByVal KeyCode As MSForms.ReturnInteger, ByVal Shift As Integer)
Application.ScreenUpdating = False
End Sub
'Adds values to combobox if they contain the string input by user
Private Sub ComboBox1_Change()
Dim pos As Integer
Dim i As Integer
ComboBox1.Clear
For Count = 1 To LC
pos = InStr(1, ComboArray(Count), ComboBox1.Value)
If pos <> 0 Then
With ComboBox1
.AddItem Cells(1, Count)
End With
End If
Next Count
End Sub

Answer 1

Here is a simple example, which may need refinement for your purposes, but illustrates the general principles of using the KeyPress event to build a string of user input, and compare that to each item in the list, effectively filtering the list to values that start with the input string.
This needs some refinement to handle backspacing, deleting, etc., which I tried to do, but didn't get as far as I'd like.
Code:
Option Explicit
Dim cbList As Variant
Dim userInput$
'### USERFORM EVENTS
Private Sub ComboBox1_KeyDown(ByVal KeyCode As MSForms.ReturnInteger, ByVal Shift As Integer)
Select Case KeyCode
Case 8, 48
'MsgBox "Backspace"
Debug.Print "Backspace"
If userInput <> "" Then
userInput = Left(userInput, Len(userInput) - 1)
End If
Case 46
'MsgBox "Delete"
Debug.Print "Delete"
userInput = Replace(userInput, ComboBox1.SelText, "")
End Select
End Sub
Private Sub UserForm_Activate()
Dim cl As Range
userInput = ""
For Each cl In Range("A1:A8")
Me.ComboBox1.AddItem cl.Value
Next
Me.ComboBox1.MatchRequired = False
cbList = Me.ComboBox1.List
End Sub
Private Sub UserForm_Terminate()
userInput = ""
End Sub
'#### END USERFORM EVENTS
'#### COMBOBOX EVENTS
Private Sub ComboBox1_KeyPress(ByVal KeyAscii As MSForms.ReturnInteger)
Me.ComboBox1.List = cbList
' Capture the user input in module variable
userInput = userInput & Chr(KeyAscii)
Debug.Print "input: " & userInput
Debug.Print KeyAscii
Dim i As Long, itm
For i = Me.ComboBox1.ListCount - 1 To 0 Step -1
itm = Me.ComboBox1.List(i)
If Not StartsWith(CStr(itm), userInput) Then
Me.ComboBox1.RemoveItem i
End If
Next
If Me.ComboBox1.ListCount = 0 Then
Me.ComboBox1.List = cbList
Else
Me.ComboBox1.List = Me.ComboBox1.List
End If
Me.ComboBox1.DropDown
End Sub
'#### END COMBOBOX EVENTS
'#### HELPER FUNCTIONS
Function StartsWith(imtVal$, inputStr$, Optional caseSensitive As Boolean = False)
', Optional caseSensitive As Boolean = False
'If Not caseSensitive Then
imtVal = LCase(imtVal)
inputStr = LCase(inputStr)
'End If
StartsWith = VBA.Strings.Left(imtVal, Len(inputStr)) = inputStr
End Function
'#### END HELPER FUNCTIONS