textbox to allow only integers RSS

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  etg1103

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  905 Points

  189 Posts

  textbox to allow only integers

  Aug 12, 2005 10:01 PM|LINK

  I have textboxes that I only want to allow integers.  One thing on these textboxes is I have OnTextChange to do calculations.  Now the thing is if the user puts anything else other than an integer I get an error.  Is the a validator or something that will not allow the user to put something else.
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  FrankWhite

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  538 Posts

  Re: textbox to allow only integers

  Aug 13, 2005 01:33 AM|LINK

  Preferably you'd want to use Javascript for this.  (I don't have any handy at the moment)  If you're using Visual Basic, you can use the IsNumeric() function on the server-side to make sure the value is an integer.
  "I would love to change the world, but they won't give me the source code." -unknown
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  joteke

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  ASPInsiders

  MVP

  Re: textbox to allow only integers

  Aug 13, 2005 06:21 PM|LINK

  Hi,

  first of all, if user must always enter something, assign a RequiredFieldValidator to the TextBox.
  
  <asp:RequiredFieldValidator ID="ReqVal1" runat="server" ControlToValidate="TextBox1" ErrorMessage="Input is required"  />
  
  Then to make sure that only integers are allowed, you can utilize CompareValidator (it won't run if user hasn't entered anything, therefore  RequiredFieldValidator is also needed)

  <asp:CompareValidator ID="intVal1" runat="server"  ControlToValidate="TextBox1" Operator="DataTypeCheck" Type="Integer" ErrorMessage="Only integers are allowed"  />

  (If there's the chance that browser is not IE or doesn't support client-side validation, also check Page.IsValid at server-side)
  
  There's also commercial control, Peter Blum's IntegerTextBox

  Thanks,
  
  Teemu Keiski
  Finland, EU
  
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  smiling4ever

  All-Star

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  Re: textbox to allow only integers

  Aug 13, 2005 08:10 PM|LINK

  This class will help you well
  
  Public Class NumericTextBox

      Inherits System.Windows.Forms.TextBox

      Public Sub New()
          MyBase.New()

          Me.Text = 0

      End Sub

      Public Sub New(ByVal Value As Double)
          MyBase.New()

          Me.Text = Value

      End Sub

      Enum DataTypes
          dtAny
          dtInteger
          dtDouble
      End Enum

      Private mDataType As DataTypes
      Public Property DataType() As DataTypes
          Get
              Return mDataType
          End Get
          Set(ByVal Value As DataTypes)
              mDataType = Value
          End Set
      End Property

      Public Overrides Property Text() As String
          Get
              Return MyBase.Text

          End Get
          Set(ByVal Value As String)
              Select Case Me.DataType
                  Case DataTypes.dtAny
                      MyBase.Text = Value
                  Case DataTypes.dtDouble
                      Try
                          MyBase.Text = _
                           System.Convert.ToDouble(Value)
                      Catch
                          MyBase.Text = 0
                      End Try

                  Case DataTypes.dtInteger
                      Try
                          MyBase.Text = _
                            System.Convert.ToInt32(Value)
                      Catch
                          MyBase.Text = 0
                      End Try
              End Select
          End Set
      End Property

      Private Sub NumericTextBox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles MyBase.KeyPress
          If Me.DataType = DataTypes.dtInteger Then
              If Not (e.KeyChar.IsDigit(e.KeyChar) Or _
              e.KeyChar = ControlChars.Tab Or _
              e.KeyChar = ControlChars.Back) Then
                  e.Handled = True
              End If

          ElseIf Me.DataType = DataTypes.dtDouble Then
              If Not (e.KeyChar.IsDigit(e.KeyChar) Or _
              e.KeyChar = ControlChars.Tab Or _
              e.KeyChar = ControlChars.Back Or _
              e.KeyChar = ".") Then
                  e.Handled = True
              End If
          End If

      End Sub
  End Class
  

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  tim.guo

  Member

  5 Points

  1 Post

  Re: textbox to allow only integers

  Aug 14, 2005 03:27 AM|LINK

  web base application u can do this:
  
  /*======================================================================*/
  string clientScript;
  clientScript="if ( !( (window.event.keyCode > 47) && (window.event.keyCode <= 57))) {  window.event.keyCode=0; }";
  this._txtBox.Attributs.add("keypress",clientScript);
  /*======================================================================*/