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VBA AddHandler????

Posted on 2011-02-21
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Last Modified: 2012-08-14
If I add a checkbox via code at run-time, how can add code to fire when the user clicks on it?

In VB.net I would use addhandler, but I know this isnt what I need to do with VBA.

Reading up, I thought I could just use chkNew.onClick myMethod(), but that doesnt work either.

Does anyone have an exampe of how to add a handler to a CheckBox in VBA?

Thank you
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Question by:tonelm54
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LVL 85

Expert Comment

by:Rory Archibald
ID: 34947042
What kind of checkbox (Forms or ActiveX), and where are you adding it?
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LVL 85

Expert Comment

by:Rory Archibald
ID: 34947051
If it's Forms, then you set its OnAction property to the name of the macro you want to run.
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Author Comment

by:tonelm54
ID: 34947150
I'm using MSForms.CheckBox, but looking at the intellisence there is no inaction property I can assign my macro to. I need to be able to add it by code.
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Expert Comment

by:Rory Archibald
ID: 34947191
Where are you adding it to? A Userform or a worksheet?
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Expert Comment

by:Rory Archibald
ID: 34947195
(that's not, oddly, the Forms control I was referring to)
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Author Comment

by:tonelm54
ID: 34947215
It's a userform

Thank you
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LVL 85

Expert Comment

by:Rory Archibald
ID: 34947236
In that case, your best bet is to use a class with a Checkbox variable declared WithEvents and put your Click code in that. Then as you add each checkbox, create an instance of the class, assign the checkbox to the class's variable and then add the class instance to a Collection (declared at module level in the userform).
Do you need sample code for that?
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Author Comment

by:tonelm54
ID: 34949103
Err, do you have any sample code for that? Sounds a very complex way of doing a simple task :-S
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Author Comment

by:tonelm54
ID: 34950161
My code I currently have is:-
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Author Comment

by:tonelm54
ID: 34950164
ok, this time I attach the code!!!

Private Sub UserForm_Activate()
      Dim newCheckBox  As MSForms.CheckBox
        
        Set newCheckBox = Frame1.Controls.Add("Forms.CheckBox.1")
        newCheckBox.Caption = "Hello " & x
        newCheckBox.Top = x * 30
        newCheckBox.Left = 10
        
        newCheckBox.OnAction = "Checkbox_Toggle"
                
        Frame1.Controls.Add newCheckBox
End Sub

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Sorry!
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Accepted Solution

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Rory Archibald earned 500 total points
ID: 34950223
Class module called CheckboxHandler:
Option Explicit

Public WithEvents cb As MSForms.CheckBox

Private Sub cb_Click()
   MsgBox "You clicked checkbox: " & cb.Name
End Sub

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Userform code:
Option Explicit

Dim colCBHandlers As Collection

Private Sub UserForm_Activate()
   Dim objHandler As CheckboxHandler
 Dim x As Integer
   Set colCBHandlers = New Collection
   
    For x = 1 To 100 Step 1
        Dim newCheckBox  As MSForms.CheckBox
        Set newCheckBox = Me.Frame1.Controls.Add("Forms.CheckBox.1")
        newCheckBox.Caption = "Hello " & x
        newCheckBox.Top = x * 30
        newCheckBox.Left = 10
        ' create new handler
        Set objHandler = New CheckboxHandler
        ' assign checkbox
        Set objHandler.cb = newCheckBox
        colCBHandlers.Add objHandler
    Next x

End Sub

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