Add a new sheet using Input Box, check existing sheet names and invalid sheet names - vba

Question

Im new to VBA but i need to do something with it. I want to make input box that add a new sheet with specific name. somehow i can make it after some searching over the forum. here are the steps that i want to do, but i cant make it completely done.
make input box that ask a name of new sheet (it's done).
when the name of sheet is already available then a msg box appear
that it can't make a new sheet but when the opposite happen then a
new sheet is made (it's done too).
the last is i want to make when the input box is blank a new msg box
appear and ask to enter different name (this i can't do).
Here's the code im using so far
Public Sub CariSheet()
Dim SheetName As String
Dim shExists As Boolean
Do
SheetName = InputBox("Write the name of sheet", "Add Sheet")
If NamaSheet <> "" Then
shExists = SheetExists(SheetName)
If Not shExists Then
Worksheets.Add(After:=Worksheets(Worksheets.Count)).Name = SheetName
MsgBox "The sheet " & (SheetName) & " is successfuly made", , "Result"
Else
MsgBox "The name is already exist, please enter a new name", vbOKOnly + vbInformation, "Name"
End If
End If
Loop Until Not shExists Or SheetName = ""
End Sub
Private Function SheetExists(ByVal SheetName As String, _
Optional ByVal wb As Workbook)
If wb Is Nothing Then Set wb = ActiveWorkbook
On Error Resume Next
SheetExists = Not wb.Worksheets(SheetName) Is Nothing
End Function
any help will be appreciated, thanks in advance for your attention. ah and sorry for my bad english.

Answer 1

Check if this code helps you:
Just added Else part for you Main If condition where you check If Sheetname is not blank.
Also, You can also uncomment my line Exit Sub if you want to exit subroutine in case of blank input box.
Public Sub CariSheet()
Dim SheetName As String
Dim shExists As Boolean
Do
SheetName = InputBox("Write the name of sheet", "Add Sheet")
If SheetName <> "" Then
shExists = SheetExists(SheetName)
If Not shExists Then
Worksheets.Add(After:=Worksheets(Worksheets.Count)).Name = SheetName
MsgBox "The sheet " & (SheetName) & " is successfuly made", , "Result"
Else
MsgBox "The name is already exist, please enter a new name", vbOKOnly + vbInformation, "Name"
End If
Else
MsgBox "Please enter a sheet name.", vbOKOnly + vbInformation, "Warning"
'Exit Sub
End If
Loop Until Not shExists Or SheetName = ""
End Sub

Answer 2

This code caters for errors for either:
the sheet name already existing
the sheet name being invalid (empty (ie ""), too long or invalid characters)
Code updates so sheet name is validated for length, and then by a Regexp for Valid characters for Excel sheet names before the sheet is created
If either 1 or 2 is true the user is re-prompted (with an additional try again message)
Public Sub CariSheet()
Dim SheetName As String
Dim bFinished As Boolean
Dim strMsg As String
Dim ws As Worksheet
Do While Not bFinished
SheetName = InputBox("Pls enter the name of the sheet", strMsg, "Add Sheet")
On Error Resume Next
Set ws = Sheets(SheetName)
On Error GoTo 0
If ws Is Nothing Then
Select Case Len(SheetName)
Case 0
strMsg = "Sheet name is blank"
Case Is > 31
strMsg = "Sheet name exceeds 31 characters"
Case Else
If ValidSheetName(SheetName) Then
Set ws = Worksheets.Add(After:=Worksheets(Worksheets.Count))
ws.Name = SheetName
Else
strMsg = "Sheet name has invalid characters"
End If
End Select
Else
strMsg = "Sheet exists"
Set ws = Nothing
End If
Loop
End Sub
test for valid sheet name
Function ValidSheetName(strIn As String) As Boolean
Dim objRegex As Object
Set objRegex = CreateObject("vbscript.regexp")
objRegex.Pattern = "[\<\>\*\\\/\?|]"
ValidSheetName = Not objRegex.test(strIn)
End Function