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There are many times in Excel VBA that we are required to gather information from a user. Probably the most frequent method of doing is via a message box, that is;
Sub UserInput() Dim iReply As Integer iReply = MsgBox(Prompt:="Do you wish to run the 'update' Macro", _ Buttons:=vbYesNoCancel, Title:="UPDATE MACRO") If iReply = vbYes Then Run "UpdateMacro" ElseIf iReply = vbNo Then 'Do Other Stuff Else 'They cancelled (VbCancel) Exit Sub End If End Sub
As you can though, the message
box approach only allows for pre-determined responses. To actually allow the
user to enter some text, number or even a formula we can use the InputBox
Function. The syntax for the InputBox Function is;
InputBox(prompt[, title] [, default] [, xpos] [, ypos] [, helpfile, context])
It is rare that you will need to use [, xpos] [, ypos] or [, helpfile, context]. See Excel help for details on these. It should also be noted that, the InputBox Function returns a String only when used in this way. (more on another way soon).
Ok, lets assume we need to gather the name of the user and do some stuff depending on that name. The macro below will achieve this.
Sub GetUserName() Dim strName As String strName = InputBox(Prompt:="You name please.", _ Title:="ENTER YOUR NAME", Default:="Your Name here") If strName = "Your Name here" Or _ strName = vbNullString Then Exit Sub Else Select Case strName Case "Bob" 'Do Bobs stuff Case "Bill" 'Do Bills stuff Case "Mary" 'Do Marys stuff Case Else 'Do other stuff End Select End If End Sub
Note the use of the
Select Case Statement
to determine the name the user supplies.
When we precede the InputBox Function with "Application" we get an InputBox Method that will allow us to specify the type of info that we can collect. Its Syntax is;
InputBox(Prompt, Title, Default, Left, Top, HelpFile, HelpContextId, Type)
As you can see, the Prompt, Title and Default are the same as in the InputBox Function. However, it is the last argument "Type" that allows us to specify the type of data we are going to collect. These are as shown below;
Type:=0 A formula
Type:=1 A number
Type:=2 Text (a string)
Type:=4 A logical value (True or False)
Type:=8 A cell reference, as a Range object
Type:=16 An error value, such as #N/A
Type:=64 An array of values
We have already covered a String being returned so lets look, what I believe, to be the most useful. That is, Type 8 & 1. The code below shows how we can allow the user to specify a Range Object.
Sub RangeDataType() Dim rRange As Range On Error Resume Next Application.DisplayAlerts = False Set rRange = Application.InputBox(Prompt:= _ "Please select a range with your Mouse to be bolded.", _ Title:="SPECIFY RANGE", Type:=8) On Error GoTo 0 Application.DisplayAlerts = True If rRange Is Nothing Then Exit Sub Else rRange.Font.Bold = True End If End Sub
Note the use of both, On
Error Resume Next and Application.DisplayAlerts = False. These
stop Excel from trying to handle any bad input from the user, or if they
Cancel. Take the lines out, run the code and click Cancel, or specify a non
valid range and Excel will bug out in the case of Cancel.
Let's now look at how we can collect a numeric value from a user.
Sub NumericDataType() Dim lNum As Long On Error Resume Next Application.DisplayAlerts = False lNum = Application.InputBox _ (Prompt:="Please enter you age.", _ Title:="HOW OLD ARE YOU", Type:=1) On Error GoTo 0 Application.DisplayAlerts = True If lNum = 0 Then Exit Sub Else MsgBox "You are " & lNum & " years old." End If End Sub
Again, we take over the
possibility of the user electing to Cancel, or entering a non-numeric value.
If they enter anything that is not numeric and click OK, they are taken back
to the InputBox Method with their entry highlighted.
Unlike the InputBox Function, we can combine different Types for the InputBox Method and take action based on their data type. See example.
Sub Numeric_RangeDataType() Dim vData On Error Resume Next Application.DisplayAlerts = False vData = Application.InputBox _ (Prompt:="Please select a single cell housing the number, " _ & "or enter the number directly.", _ Title:="HOW OLD ARE YOU", Type:=1 + 8) On Error GoTo 0 Application.DisplayAlerts = True If IsNumeric(vData) And vData <> 0 Then MsgBox "You are " & vData & " years old." Else Exit Sub End If End Sub
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