如何将文本框输入限制为数值？

Question

我有将在多页内创建文本框的代码：

Private Sub CommandButton1_Click()

RowChar = 70
MultiPage1.Pages.Clear

For i = 0 To TextBox1.Value - 1
    MultiPage1.Pages.Add
    MultiPage1.Pages(i).Caption = "Variable" & i + 1

    Call LabelPerPage

    Set txtbx = UserForm1.MultiPage1.Pages(i).Controls.Add("Forms.TextBox.1", "NameBox")
    With txtbx
        .Top = 20
        .Left = 100
    End With

    Set txtbx = UserForm1.MultiPage1.Pages(i).Controls.Add("Forms.TextBox.1", "MinBox")
    With txtbx
        .Top = 50
        .Left = 100
    End With

    Set txtbx = UserForm1.MultiPage1.Pages(i).Controls.Add("Forms.TextBox.1", "LsbBox")
    With txtbx
        .Top = 20
        .Left = 300
    End With

    Set txtbx = UserForm1.MultiPage1.Pages(i).Controls.Add("Forms.TextBox.1", "MaxBox")
    With txtbx
        .Top = 50
        .Left = 300
    End With

    If i = 0 Then
        FormulaString = "= C15"
    Else
        FormulaString = FormulaString & "  " & Chr(RowChar) & "15"
        RowChar = RowChar + 3
    End If
Next i
TextBox2.Value = FormulaString
End Sub

Private Sub LabelPerPage()
    Set txtbx = UserForm1.MultiPage1.Pages(i).Controls.Add("Forms.Label.1")
    With txtbx
        .Top = 20
        .Left = 50
        .Caption = "NAME:"
    End With

    Set txtbx = UserForm1.MultiPage1.Pages(i).Controls.Add("Forms.Label.1")
    With txtbx
        .Top = 50
        .Left = 50
        .Caption = "MIN:"
    End With

    Set txtbx = UserForm1.MultiPage1.Pages(i).Controls.Add("Forms.Label.1")
    With txtbx
        .Top = 20
        .Left = 250
        .Caption = "LSB:"
    End With

    Set txtbx = UserForm1.MultiPage1.Pages(i).Controls.Add("Forms.Label.1")
    With txtbx
        .Top = 50
        .Left = 250
        .Caption = "MAX:"
    End With
End Sub

我试图创建一个页面以及其中的文本框，我的问题是我无法对TextBox进行KeyPress，因为它只会由于我的代码而自动创建。

目标：

1。）要执行KeyPress，则TextBox无法输入数字值或Letter。

2。）我想比较两个文本框，其中textbox1应该小于textbox2

我尝试过：

选项1：

Private Sub MaxBox_KeyPress(ByVal KeyAscii As MSForms.ReturnInteger)
If (KeyAscii > 46 And KeyAscii < 58) Or KeyAscii = 43 Then
KeyAscii = KeyAscii
Else
KeyAscii = 0
MsgBox "Invalid key pressed, you can enter numbers only"
End If
End Sub

选项2：

Private Sub OnlyNumbers()
    If TypeName(Me.ActiveControl) = "MaxBox" Then
        With Me.ActiveControl
            If Not IsNumeric(.Value) And .Value <> vbNullString Then
                MsgBox "Sorry, only numbers allowed"
                .Value = vbNullString
            End If
        End With
    End If
End Sub

Answer 1

为什么不完全失去keyPress，因为您要实现的唯一目标就是仅数字输入？您可以在用户表单代码中执行以下操作：

Option Explicit
'Variable to capture Change event from your textbox:
Private WithEvents maxbox As MSForms.TextBox

'The creation of the thing; I just created a multipage control to reuse your lines.
Private Sub UserForm_Initialize()
    Dim txtbox as MSForms.TextBox
    Dim i As Integer
    i = 0
    Set txtbox = UserForm1.MultiPage1.Pages(i).Controls.Add("Forms.TextBox.1", "MaxBox")
    With txtbox 
        .Top = 50
        .Left = 50
    End With
    Set maxbox = txtbox
End Sub

'Capture change of maxbox:
Private Sub maxbox_Change()
    'In case somebody entered something non-numeric:   
    If IsNumeric(maxbox.Text) = False Then
        'Remove the input character
        maxbox.Text = Left(maxbox.Text, Len(maxbox.Text) - 1)
        'And alert the user
        MsgBox "numeric only!"
    End If
End Sub

如果需要多个，也可以只创建一个捕获事件的自定义类，然后将该类的collection添加到用户窗体中。为此，您可以查看答案on this question

Edit：对于后半部分（针对Minbox进行验证），您可以使用相同的事件：只需添加另一个if语句以确保数字值为> CInt(minbox.text)（或其他数字类型）。

编辑2：如果字符串的长度为0（即，当有人按下Backspace / Delete触发更改事件时，您可能想为Left(maxbox.Text, Len(maxbox.Text) - 1)位添加错误处理）。