How to detect if user select cancel InputBox VBA Excel - excel

Question

I have an input box asking user to enter a date. How do I let the program know to stop if the user click cancel or close the input dialog instead of press okay.
Something like
if str=vbCancel then exit sub
Currently, user can hit OK or Cancel but the program still runs
str = InputBox(Prompt:="Enter Date MM/DD/YYY", _
Title:="Date Confirmation", Default:=Date)

Answer 1

If the user clicks Cancel, a zero-length string is returned. You can't differentiate this from entering an empty string. You can however make your own custom InputBox class...
EDIT to properly differentiate between empty string and cancel, according to this answer.
Your example
Private Sub test()
Dim result As String
result = InputBox("Enter Date MM/DD/YYY", "Date Confirmation", Now)
If StrPtr(result) = 0 Then
MsgBox ("User canceled!")
ElseIf result = vbNullString Then
MsgBox ("User didn't enter anything!")
Else
MsgBox ("User entered " & result)
End If
End Sub
Would tell the user they canceled when they delete the default string, or they click cancel.
See http://msdn.microsoft.com/en-us/library/6z0ak68w(v=vs.90).aspx

Answer 2

Following example uses InputBox method to validate user entry to unhide sheets:
Important thing here is to use wrap InputBox variable inside StrPtr so it could be compared to '0' when user chose to click 'x' icon on the InputBox.
Sub unhidesheet()
Dim ws As Worksheet
Dim pw As String
pw = InputBox("Enter Password to Unhide Sheets:", "Unhide Data Sheets")
If StrPtr(pw) = 0 Then
Exit Sub
ElseIf pw = NullString Then
Exit Sub
ElseIf pw = 123456 Then
For Each ws In ThisWorkbook.Worksheets
ws.Visible = xlSheetVisible
Next
End If
End Sub

Answer 3

The solution above does not work in all InputBox-Cancel cases. Most notably, it does not work if you have to InputBox a Range.
For example, try the following InputBox for defining a custom range ('sRange', type:=8, requires Set + Application.InputBox) and you will get an error upon pressing Cancel:
Sub Cancel_Handler_WRONG()
Set sRange = Application.InputBox("Input custom range", _
"Cancel-press test", Selection.Address, Type:=8)
If StrPtr(sRange) = 0 Then 'I also tried with sRange.address and vbNullString
MsgBox ("Cancel pressed!")
Exit Sub
End If
MsgBox ("Your custom range is " & sRange.Address)
End Sub
The only thing that works, in this case, is an "On Error GoTo ErrorHandler" statement before the InputBox + ErrorHandler at the end:
Sub Cancel_Handler_OK()
On Error GoTo ErrorHandler
Set sRange = Application.InputBox("Input custom range", _
"Cancel-press test", Selection.Address, Type:=8)
MsgBox ("Your custom range is " & sRange.Address)
Exit Sub
ErrorHandler:
MsgBox ("Cancel pressed")
End Sub
So, the question is how to detect either an error or StrPtr()=0 with an If statement?

Answer 4

If your input box is an array, it does not work. I have solved it by adding a check for if it is an array first.
Dim MyArrayCheck As String
Dim MyPlateMapArray as variant
MyPlateMapArray = Application.InputBox("Select ....", Type:=8)
MyArrayCheck = IsArray(MyPlateMapArray)
If MyArrayCheck = "False" Then
Exit Sub
End If

Answer 5

I have solved it with a False like below
MyLLOQ = Application.InputBox("Type the LLOQ number...", Title:="LLOQ to be inserted in colored cells.", Type:=1)
If MyLLOQ = False Then Exit Sub
If user click cancel the sub will exit.

Answer 6

Another suggestion.
Create a message box when inputbox return null value. Example:
Dim PrC as string = MsgBox( _
"No data provided, do you want to cancel?", vbYesNo+vbQuestion, "Cancel?")

Answer 7

Sub TestInputBox()
Dim text As String
text = InputBox("Type some text")
If text = "" Then
MsgBox "button cancel pressed or nothing typed"
Else
MsgBox text
End If
End Sub

Answer 8

Inputbox send a boolean False value when Cancel is pressed.
contenidoy = Application.InputBox("Cantidad = ", titulox, contenidox, , , , , Type:=1)
'ESC or CANCEL
If contenidoy = False Then
MsgBox "Cancelado"
Else
MsgBox "Edición aceptada"
'End If