vb2010 datagridview auto text
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Thread: vb2010 datagridview auto text

  1. #1
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    vb2010 datagridview auto text

    I would like for my datagridview to automatically fill in the column's next row with the previous entry + 1 letter. So say my datagrid is like this:

    ID NextField
    15-3A xxxxx
    15-3B xxxxx
    15-3C xxxxx

    Everything is working fine if I type it in but would be nice if the user didn't have to type this each time and just have it fill in the next consecutive ID automatically when you press down to start a new row. Also i need it to work no matter what gets typed in... so if I make another ID 15-4A it will start filling in 15-4B etc. on each new row.

    Any Ideas?

    Thanks

  2. #2
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    Re: vb2010 datagridview auto text

    Well, you should be using a GUID to identify each key. Then, you can assign/change each generated number when you want, even if editing is not allowed!

    Link tables via their GUID, and you'll have no problems with keys
    David

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  3. #3
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    Re: vb2010 datagridview auto text

    I have looked at it and I'm just not able to understand how to do it, I've never worked with GUID's. I'm using MS Access as my database, my key is just a text type, GUID is not an option. Is there some code example you can think of that will make my datagridview "ID" column's next row default the previous row's ID + the next consecutive letter?

  4. #4
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    Re: vb2010 datagridview auto text

    Only if you code it by hand..
    David

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  5. #5
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    Re: vb2010 datagridview auto text

    That's what I've been needing help with, the code...

    I can do the current code which works fine for putting in a default value:

    Private Sub DataGridView1_DefaultValuesNeeded(ByVal sender As Object, _
    ByVal e As System.Windows.Forms.DataGridViewRowEventArgs) _
    Handles DataGridView1.DefaultValuesNeeded

    With e.Row
    .Cells("ID").Value = "15-4A"
    End With

    End Sub

    Can anyone think of a way to modify it to work with my application? I need the value of "15-4A" to be the "last row + next consecutive letter" so the datagrid will fill in "15-4B", "15-4C", etc., not keep repeating "15-4A"?

    Thanks

  6. #6
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    Re: vb2010 datagridview auto text

    Sure. Each letter has a numerical value, so you'd use the lowest A or a, to the upper z or Z.

    You'd have to write a module to generate the value by hand. Pass the current value, and add one. You have to know what to do when it overflows, though
    David

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  7. #7
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    Re: vb2010 datagridview auto text

    I'm not concerned with overflow... I won't have more than 10 letters used. One last thing I thought of, is there a default expression for access that may be easier than coding all this in? If so, what would it be?

    Thanks

  8. #8
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    Thumbs up Solved vb2010 datagridview auto text

    I don't know if this is the "best" way to do it, but it got the job done for anyone looking to do this. Maybe someone can come up with a much more simple way, I'm a noob! I had to hide a textbox in the form too, to make this work.




    Private Sub ConBreakDataDataGridView_DefaultValuesNeeded(ByVal sender As Object, _
    ByVal e As System.Windows.Forms.DataGridViewRowEventArgs) _
    Handles ConBreakDataDataGridView.DefaultValuesNeeded

    'Make your textbox display the datagridview cell

    TextBox1.Text = Me.DataGridView.CurrentRow.Cells("ID").Value.ToString

    Dim cnt As Integer

    ' count the characters in textbox1
    cnt = Len(TextBox1.Text)

    'Selects from the left always one character shorter than the last character in your field.
    'Do this for however many characters you want to have in your field (I have 12).
    Dim string1 As String = Microsoft.VisualBasic.Left(Me.TextBox1.Text, 0)
    Dim string2 As String = Microsoft.VisualBasic.Left(Me.TextBox1.Text, 1)

    'Select only the last character in your field (from the right).
    Dim chglast As String = Microsoft.VisualBasic.Right(Me.TextBox1.Text, 1)

    'Make your textbox display your left string and your right string
    If cnt = 1 Then
    Me.TextBox1.Text = string1 & (Chr(Asc(chglast) + 1))
    ElseIf cnt = 2 Then
    Me.TextBox1.Text = string2 & (Chr(Asc(chglast) + 1))
    'Add one of these statements for every string you have (I have 12)

    'Limit the size of your character field
    ElseIf cnt > 12 Then
    MsgBox("Please use 12 or less characters.")
    ElseIf cnt < 1 Then
    MsgBox("ID cannot be blank.")
    End If

    'Make your next row's field display your updated textbox value as default

    With e.Row
    .Cells("ID").Value = TextBox1.Text
    End With

    End Sub

  9. #9
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    Re: vb2010 datagridview auto text

    http://www.freevbcode.com/ShowCode.asp?ID=5440 ???

    Code:
    Function IncrementString(ByVal strString As String) As String
    '
    ' Increments a string counter
    ' e.g.  "a" -> "b"
    '       "az" -> "ba"
    '       "zzz" -> "aaaa"
    '
    ' strString is the string to increment, assumed to be lower-case alphabetic
    ' Return value is the incremented string
    '
    
      Dim lngLenString As Long
      Dim strChar As String
      Dim lngI As Long
      
      lngLenString = Len(strString)
      
      ' Start at far right
      For lngI = lngLenString To 0 Step -1
      
        ' If we reach the far left then add an A and exit
        If lngI = 0 Then
          strString = "a" & strString
          Exit For
        End If
        
        ' Consider next character
        strChar = Mid(strString, lngI, 1)
        If strChar = "z" Then
          ' If we find Z then increment this to A
          ' and increment the character after this (in next loop iteration)
          strString = Left$(strString, lngI - 1) & "a" & Mid(strString, lngI + 1, lngLenString)
        Else
          ' Increment this non-Z and exit
          strString = Left$(strString, lngI - 1) & Chr(Asc(strChar) + 1) & Mid(strString, lngI + 1, lngLenString)
          Exit For
        End If
        
      Next lngI
    
      IncrementString = strString
      Exit Function
      
    End Function
    David

    CodeGuru Article: Bound Controls are Evil-VB6
    2013 Samples: MS CODE Samples

    CodeGuru Reviewer
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    2006, 2007 & 2008 MVP Visual Basic
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