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Thread: Concatenate controls/commands to handle multiple controls with one function

Henk
Posts: 5

Concatenate controls/commands to handle multiple controls with one function Your last visit to this thread was on 1/1/1970 12:00:00 AM

Posted: 23 Jan 07 10:44 AM

Hi. I'm not sure if it is possible but here's the code I want to use;


Sub CheckBoxVisibility(sControlName)
 
    Dim checkbox, editbox, picklist
 
    checkbox = "chk" & sControlName & ".state"
    editbox = "edb" & sControlName & ".Visible"
    picklist = "pkl" & sControlName & ".Visible"
 
      if checkbox = cbChecked then
 
         editbox = True
         picklist = False
 
      elseif checkbox = cbUnchecked then
 
         editbox = False
         picklist = True
 
      end if
 
end sub
 
Sub chkSM1Click(Sender)
 
    Dim sControlName
    sControlName = Right(Sender.name, 3)
 
    Call CheckboxVisibility(sControlName)
 
End Sub

In short, I have controls like edbSM1 (editbox), edbSM2, edbSM3, chkSM1 (checkbox), chkSM1, pklSM1 (picklist), pklSM2. It would save time to use a functions as above to use dynamic controls. But it doesn't recognize

  checkbox = "chk" & sControlName & ".state"

as a control and its attribute, so the if doesn't work and always returns false. It should return

  chkSM1.state

which is obviously the state of the checkbox ()chChecked or cbUnchecked.

So is it possible to concatenate controls or commands??? And if yes, how?

[Reply][Quote]

Timmus Agersea
Posts: 328

Re: Concatenate controls/commands to handle multiple controls with one function Your last visit to this thread was on 1/1/1970 12:00:00 AM

Posted: 23 Jan 07 1:24 PM

You can access controls via their name through the Form.Controls collection.

set oCheckbox = frmAccountDetail.Controls("chk" & sControlName)
msgbox oCheckbox.State

Timmus

[Reply][Quote]

Jeremy Brayton
Posts: 491

Re: Concatenate controls/commands to handle multiple controls with one function Your last visit to this thread was on 1/1/1970 12:00:00 AM

Posted: 23 Jan 07 6:45 PM

Ryan tipped me off to the Eval() function. Either accomplishes the same thing but Eval is useful in classes where a form isn't necessarily present.

objectControl = Eval("checkBox" + sControlName)
objectControl.Visible = true

[Reply][Quote]

Henk
Posts: 5

Re: Concatenate controls/commands to handle multiple controls with one function Your last visit to this thread was on 1/1/1970 12:00:00 AM

Posted: 24 Jan 07 1:11 AM

Great guys, this is exactly what I was looking for!

[Reply][Quote]

RJ Eaton
Posts: 234

Re: Concatenate controls/commands to handle multiple controls with one function Your last visit to this thread was on 1/1/1970 12:00:00 AM

Posted: 26 Jan 07 1:54 PM

Jeremy do you have a little more on the eval function.. I know .. I'm being lazy and didn't look it up just a quick use of.. such as Can I use it to loop through controls etc..

Thanks

[Reply][Quote]

Timmus Agersea
Posts: 328

Re: Concatenate controls/commands to handle multiple controls with one function Your last visit to this thread was on 1/1/1970 12:00:00 AM

Posted: 26 Jan 07 2:02 PM

Here is some sample code that loops through all the controls, checks the type of control, and sets the appropriate properties to make them readonly:


    For iControl = 0 To ControlCount - 1
        Select Case (TypeName(Controls(iControl)))
            Case "Edit","PickList","Memo"
                Controls(iControl).ReadOnly = True
                Controls(iControl).Color = Application.BasicFunctions.StringToColor("BtnFace")

            Case "CheckBox"', "DataGrid"
                Controls(iControl).Enabled = False

            Case "ComboBox"
                Controls(iControl).Enabled = False
                Controls(iControl).Color = Application.BasicFunctions.StringToColor("BtnFace")

            Case "LookupEdit","PopupEdit","DateTimeEdit"
                Controls(iControl).ReadOnly = True
                Controls(iControl).ButtonVisible = False
                Controls(iControl).Color = Application.BasicFunctions.StringToColor("BtnFace")

            Case "Button","Label","LinkEdit","Panel"
                ' Do Nothing

            Case Else
                'MsgBox Controls(iControl).Name & vbCrLf & TypeName(Controls(iControl))

        End Select

    Next

Hope that helps!

Timmus

[Reply][Quote]

RJ Eaton
Posts: 234

Re: Concatenate controls/commands to handle multiple controls with one function Your last visit to this thread was on 1/1/1970 12:00:00 AM

Posted: 26 Jan 07 2:16 PM

Timmus, Thanks.. this is what I do now.. was looking to see if the Eval function he described above would be easier or better.. But thanks anyway

[Reply][Quote]

Jeremy Brayton
Posts: 491

Re: Concatenate controls/commands to handle multiple controls with one function Your last visit to this thread was on 1/1/1970 12:00:00 AM

Posted: 26 Jan 07 2:56 PM

Ryan explained the Eval and Execute functions in this post: http://www.slxdeveloper.com/devhome/forum.aspx?forumid=2000&postid=4227

Eval's technical definition: http://www.devguru.com/technologies/vbscript/QuickRef/eval.html
Execute's: http://www.devguru.com/technologies/vbscript/QuickRef/execute.html

Here's how Eval helped me:


    select case stringProperty
        case "Text"
            stringVoid = objectControl.Text
        case "Enabled"
            stringVoid = objectControl.Enabled
        case "ReadOnly"
            stringVoid = objectControl.ReadOnly
        case else
            Err.Raise 8
    end select

is changed to this


    stringVoid = Eval("objectControl." + stringProperty)

Now instead of adding a new case statement for every new property I want to trap, all I have to do is pass in the correct stringProperty parameter. It changed a potentially large switch statement (had I placed in every possible property) to a 1-liner. I would probably have more examples if I took the time to look deeper into my code base, this was just what stood out the most when the lightbulb went off.

[Reply][Quote]

Ryan Farley
Posts: 2265

Re: Concatenate controls/commands to handle multiple controls with one function Your last visit to this thread was on 1/1/1970 12:00:00 AM

Posted: 26 Jan 07 6:29 PM

Basically, Eval and Execute allow you to take a string of VBScript code and "run" it at runtime, just like it was part of your script.

Eval is value returning. You could check some property for example of an unknown control:

If Eval("txtSomeTextBox.Enabled") Then
    '...
End If

While Execute is used to simply execute or run a string of code:

Execute "txtSomeTextBox.Enabled = False"
 
' or...
 
Execute "MsgBox txtSomeTextBox.Text"
' which could also be written as...
MsgBox Eval("txtSomeTextBox.Text")

Make sense?

[Reply][Quote]

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