问题
I am trying to create a dynamic User_form, where all the Controls are created at Run-Time.
I have 2 array of Combo-Boxes, first array of Combo-Boxes is "Catgeory" (CatCBArr) , and the second array of Combo-Boxes is "Item" (ItemCBArr).
I want, that once I select a value from the first Combo-Box of "Category", let's say CatCBArr(0), that only the related Items in ItemCBArr(0) will be displayed.
Issue: I can't figure out how to modify the second Combo-box (ItemCBArr(0)) according to the value selected in the first Combo-box (CatCBArr(0))
User_Form Code (relevant section)
Option Explicit
Dim ItemsNumofRows As Long
Dim QtyTB As MSForms.TextBox
Dim CatCB As MSForms.ComboBox
Dim ItemCB As MSForms.ComboBox
Dim Key As Variant
' dynamic Form controls (related to new Classes)
Dim CatCBArr() As New cComboBox
Dim ItemCBArr() As New cComboBox
Dim QtyTBArr() As New cTextBox
Private Sub UserForm_Initialize()
' reset flags
ItemsNumofRows = 5
TasksNamesUpd = False
TasksColUpd = False
ItemsRows_ControlsInit '<-- upload all Controls at run-time
Check_FormHeight
End Sub
'======================================================
Private Sub ItemsRows_ControlsInit()
For ItemRow = 0 To ItemsNumofRows
' add Category Combo-boxes
Set CatCB = Me.Controls.Add("Forms.ComboBox.1", "Cb" & ItemRow, True)
With CatCB
' loop through Dictionay items (view category)
For Each Key In Dict.Keys
.AddItem Key
Next Key
.SpecialEffect = fmSpecialEffectSunken
.Left = 40
.Width = 100
.Height = 18
.Top = 54 + 20 * ItemRow
ReDim Preserve CatCBArr(0 To ItemRow)
Set CatCBArr(ItemRow).ComboBoxEvents = CatCB
End With
' add Item Combo-boxes
Set ItemCB = Me.Controls.Add("Forms.ComboBox.1", "Cb_" & ItemRow, True)
With ItemCB
.SpecialEffect = fmSpecialEffectSunken
.Left = 160
.Width = 100
.Height = 18
.Top = 54 + 20 * ItemRow
ReDim Preserve ItemCBArr(0 To ItemRow)
Set ItemCBArr(ItemRow).ComboBoxEvents = ItemCB
End With
Next ItemRow
End Sub
cComboBox Class Code
Public WithEvents ComboBoxEvents As MSForms.ComboBox
Private Sub ComboBoxEvents_Change()
Dim CBIndex As Long
' get for ID number (row number), from third character in String Name.
' e.g "Cb1" will result 1)
CBIndex = CInt(Mid(ComboBoxEvents.Name, 3))
' ??? How do I get the Value, and update the second combo-box Items
Select Case ComboBoxEvents.Value
End Select
End Sub
GUI User_Form screen-shot
回答1:
Alright, here's the basics. Your class cCombobox I replicated as follows:
Private WithEvents ComboBoxEvents As MsForms.ComboBox
Private Sub ComboBoxEvents_Change()
Select Case ComboBoxEvents.value
Case "1":
UserForm1.DependentBox.Clear
UserForm1.DependentBox.AddItem "3"
UserForm1.DependentBox.AddItem "4"
Case "2":
UserForm1.DependentBox.Clear
UserForm1.DependentBox.AddItem "5"
UserForm1.DependentBox.AddItem "6"
Case Default:
'Do Nothing
End Select
End Sub
Public Property Let box(value As MsForms.ComboBox)
Set ComboBoxEvents = value
End Property
Public Property Get box() As MsForms.ComboBox
Set box = ComboBoxEvents
End Property
Next, I created a UserForm1 that adds 2 comboboxes, one of which I add to a local variable of type cComboBox.
Public DependentBox As MsForms.ComboBox
Private InitialBox As cComboBox
Private Sub UserForm_Initialize()
Dim cBox As MsForms.ComboBox
Set InitialBox = New cComboBox
Set cBox = Me.Controls.Add("Forms.ComboBox.1", "initial", True)
With cBox
.Left = 6
.Width = 100
.Height = 25
.Top = 6
.AddItem "1"
.AddItem "2"
End With
InitialBox.box = cBox
Set DependentBox = Me.Controls.Add("Forms.ComboBox.1", "dependent", True)
With DependentBox
.Top = 6
.Left = 126
.Height = 25
.Width = 100
End With
End Sub
Even though this works, the above approach is not very clean, since your class is not self-contained - It has to be aware of the UserForm. A better way would be to link the boxes in the class already and then just pass them from the Userform when you initialize your arrays of controls. Then it would be:
cComboBox class:
Private WithEvents p_ComboBoxEvents As MSForms.ComboBox
Private p_DependBox As MSForms.ComboBox
Private Sub p_ComboBoxEvents_Change()
Select Case p_ComboBoxEvents.value
Case "1":
p_DependBox.Clear
p_DependBox.AddItem "3"
p_DependBox.AddItem "4"
Case "2":
p_DependBox.Clear
p_DependBox.AddItem "5"
p_DependBox.AddItem "6"
Case Default:
'Do Nothing
End Select
End Sub
Public Property Let TriggerBox(value As MSForms.ComboBox)
Set p_ComboBoxEvents = value
End Property
Public Property Get TriggerBox() As MSForms.ComboBox
Set TriggerBox = p_ComboBoxEvents
End Property
Public Property Let DependBox(value As MSForms.ComboBox)
Set p_DependBox = value
End Property
Public Property Get DependBox() As MSForms.ComboBox
Set DependBox = p_DependBox
End Property
Here you see you already link the boxes in a self-contained class. In the event handler you could create a lookup for the values, etc. Then in the UserForm1 code you initialize them as follows:
Option Explicit
Private LinkedComboBox As cComboBox
Private Sub UserForm_Initialize()
Dim cBox As MSForms.ComboBox
Set LinkedComboBox = New cComboBox
Set cBox = Me.Controls.Add("Forms.ComboBox.1", "initial", True)
With cBox
.Left = 6
.Width = 100
.Height = 25
.Top = 6
.AddItem "1"
.AddItem "2"
End With
LinkedComboBox.TriggerBox = cBox
Set cBox = Me.Controls.Add("Forms.ComboBox.1", "dependent", True)
With cBox
.Top = 6
.Left = 126
.Height = 25
.Width = 100
End With
LinkedComboBox.DependBox = cBox
End Sub
EDIT: Based on the fact that it needs to be an array, you can amend the userform as follows:
Option Explicit
Private LinkedComboBox(0 To 4) As cComboBOx
Private Sub UserForm_Initialize()
Dim cBox As MSForms.ComboBox
Dim i As Integer
For i = 0 To 4
Set LinkedComboBox(i) = New cComboBOx
Set cBox = Me.Controls.Add("Forms.ComboBox.1", "initial", True)
With cBox
.Left = 6
.Width = 100
.Height = 25
.Top = 6 + (i * 25)
.AddItem "1"
.AddItem "2"
End With
LinkedComboBox(i).TriggerBox = cBox
Set cBox = Me.Controls.Add("Forms.ComboBox.1", "dependent", True)
With cBox
.Top = 6 + (i * 25)
.Left = 126
.Height = 25
.Width = 100
End With
LinkedComboBox(i).DependBox = cBox
Next i
End Sub
In the array you can access each box as LinkedComboBox(i).DependBox and LinkedComboBox(i).TriggerBox. You won't need the two seperate arrays anymore, since everything is already contained in this LinkedComboBox array
来源：https://stackoverflow.com/questions/44409871/dynamic-created-user-form-with-2-dependent-combo-boxes