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check all checkboxes

Posted on 2006-04-11
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Last Modified: 2010-04-23
This doesn't seem to be working for me...what am I missing?

        Dim ctl As CheckBox
        For Each ctl In Controls
           ctl.Checked = True
        Next
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Question by:sirbounty
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Mike Tomlinson earned 500 total points
ID: 16428411
Dim cb As CheckBox
Dim ctl As Control
For Each ctl In Me.Controls
    If TypeOf ctl Is CheckBox Then
        cb = CType(ctl, CheckBox)
        cb.Checked = True
    End If
Next


*** BUT *** this will only hit checkboxes directly contained by the FORM itself.  If the checkboxes are contained in another control (panel, groupboxes, etc) then you would need a recursive algorithm to find all of them.
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by:sirbounty
ID: 16428593
ksir - can ya explain what we're doing here?  I'm not very familiar with ctype...does that statement convert the control to a checkbox before proceeding?  Why doesn't the fact that I've established ctl as a checkbox work?  Shouldn't the loop go through all checkboxes, since ctl isn't declared as a generic control? : \
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by:Mike Tomlinson
ID: 16428650
When you use Me.Controls, you iterate ALL controls directly contained by the form.  What if you have controls on your form that are not CheckBoxes?  This would cause an error since your code would attempt to convert say a TextBox to a CheckBox in your For...Next loop!

You are correct about the CType() function.  It is converting the "ctl" variable to a CheckBox if it passed the "TypeOf ctl Is CheckBox" test (which returns True if "ctl" is a CheckBox).
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Author Comment

by:sirbounty
ID: 16428736
The way I read it was
Declare a variable as a checkbox control.  Now loop through all of those 'type' controls, not 'all' controls.
I guess it sort of makes sense, I just presumed that by declaring the ctl as a specific checkbox that that would/should limit the iteration to those types of controls only...
Thanx for the follow.
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by:Mike Tomlinson
ID: 16428765
Don't feel bad, your assumption is a pretty common one and the type of code you posted comes up on EE quite a bit.  =)
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