动态定义VBA中复选框的事件

Question

我已经为我的用户窗体动态定义了复选框。 看代码：

If rs.EOF = False Then
    i = 1
    Do Until rs.EOF Or i = 6
        With frmOne.Controls("Version" & i)
            .Visible = True
            .Caption = rs!versNo & "#" & rs!Vers_From
            .tag = rs!versNo & "_" & rs!noID & ".pdf"
        End With
        i = i + 1
        rs.MoveNext
    Loop
End If

好吧，对于这些复选框，我需要一个“点击”事件。 例如：

Private Sub Version1_Click()
   If FilterOk = True Then
       VersNr = Mid(frmOne.Version1.tag, 1, InStr(frmOne.Version1.tag, "_") - 1)
       Call funcVersion
       Exit Sub
   End If
   ...
End Sub

我怎样才能使动态？ 我不需要命令按钮。 这意味着，当用户单击复选框时，事件处理程序将启动。

Answer 1

Rory 认为这是重复的，但因为我已经写了一个小片段，所以我会在这里发布。 我希望这不违反规则。 您需要使用将处理事件的启用事件的对象创建一个自定义类。 然后，您可以将复选框的引用分配给这些对象。

一个简单的演示示例：

创建一个名为CheckBoxEventHandler的类模块，并将以下代码放入类模块中。

' This will store a reference to a checkbox and enable handling its events.
Private WithEvents m_chckBox As MSForms.CheckBox

' Method to assign a reference to a checkbox to your event handler
Public Sub AssignCheckBox(c As MSForms.CheckBox)
    Set m_chckBox = c
End Sub

' Private sub to execute something on the event
Private Sub m_chckBox_Click()
    MsgBox "Checkbox" + m_chckBox.Caption + "clicked"
End Sub

创建一个带有一些复选框的用户表单，并将以下代码放入其模块中：

' Define a collection to store your event handlers while the userform is active.
Private eventHandlerCollection As New Collection

Private Sub UserForm_Initialize()
    Dim chckBoxEventHandler As CheckBoxEventHandler, c As Control

    For Each c In UserForm1.Controls
        If TypeName(c) = "CheckBox" Then
            'Create event handler instance
            Set chckBoxEventHandler = New CheckBoxEventHandler
            'Assign it reference to a checkbox
            chckBoxEventHandler.AssignCheckBox c
            'Store the event handler in the userform's collection,
            eventHandlerCollection.Add chckBoxEventHandler
        End If
    Next
End Sub

这是在您的情况下实现这一点的可能方法

（我没有你的确切代码，所以我无法测试它，但我相信它应该给你一般的想法。）

1.新建一个名为CheckboxEventHandler类

Public WithEvents chckBox As MSForms.CheckBox

Private Sub chckBox_Click()
    Debug.Print "Checkbox" + chckBox.Caption + "clicked"
    ' Do your click-handler logic here.
    ' If you need private variables that are defined elsewhere, you can define the function
    ' whereever you need it and use the eventhandler only to call it and pass it a reference to the clicked checkbox:
    Call somefunction(chckBox)
    ' Or you could define the function as a public method in frmOne and call it from here like this:
    Call frmOne.somefunction(chckBox)
End Sub

2. 在frmOne中的代码frmOne添加以下内容：

' Define a collection to store event handlers.
Private eventHandlerCollection As New Collection

' Method for adding clickhandlers to checkBoxes dynamically
Public Sub createClickHandler(c As MSForms.CheckBox)
    Dim eventHandler As New CheckBoxEventHandler
    eventHandler.chckBox = c
    Call eventHandlerCollection.Add(eventHandler)
End Sub

3. 将事件处理程序附加到复选框

If rs.EOF = False Then
    i = 1
    Do Until rs.EOF Or i = 6

        With frmOne.Controls("Version" & i)
            .Visible = True
            .Caption = rs!versNo & "#" & rs!Vers_From
            .Tag = rs!versNo & "_" & rs!noID & ".pdf"
        End With

        'register event listener
        frmOne.createClickHandler (frmOne.Controls("Version" & i))
        i = i + 1
        rs.MoveNext
    Loop
End If

Answer 2

使用复选框的AfterUpdate事件

Private Sub MyCheckBox_AfterUpdate()

   ' If the checkbox is unchecked, do nothing
   If MyCheckbox = False Then Exit Sub  

   ' If the checkbox is checked, do whatever you want:
   If FilterOk = True Then
       VersNr = Mid(frmOne.Version1.tag, 1, InStr(frmOne.Version1.tag, "_") - 1)
       Call funcVersion
       Exit Sub
   End If
   ...
End Sub