Validate textbox with vb.net web forma

Question

I need help to restrict my textbox to accept just numbers. I have another textbox event textchanged and in that condition I want to not allow user to write other characters than numbers. have implemented the maxlength but I can't validate to accpet just numbers. here is my condition that I want to implement in:

 Protected Sub txtIdType_TextChanged(sender As Object, e As EventArgs)
      Dim txtb As TextBox = CType(FormViewPerson.FindControl("txtIdType"), TextBox)
      Dim txtb1 As TextBox = CType(FormViewPerson.FindControl("TextBoxIDCode"), TextBox)

      If (txtb.Text = "Leternjoftimi" OrElse txtb.Text = "KosovoIDCard" OrElse txtb.Text = "Licna karta") Then
           txtb1.MaxLength = 10
      End If
 End Sub

HEEN · Accepted Answer · 2015-04-27 13:54:32Z

2

You can do this simply in aspx page, like below:-

<asp:TextBox ID="txtNumbers" runat="server" autocomplete="off" ValidationGroup="AddNew"></asp:TextBox>
<asp:RegularExpressionValidator ID="regNumbers" runat="server" ErrorMessage="Only numbers are allowed" ControlToValidate="txtNumbers" ValidationExpression="^[0-9]*$" ValidationGroup="AddNew"></asp:RegularExpressionValidator>

You don't need to use the code-behind for this. Hope this helps

edited Apr 27, 2015 at 13:54

answered Apr 27, 2015 at 13:48

HEEN

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4 Comments

user2568960 Over a year ago

I need just when txtb.Text = "Leternjoftimi" txtb1 to write just numbers not for all types

HEEN Over a year ago

Will always txtb.Text = Leternjoftimi and where you will write only numbers. Please specify your doubts clearly. As by your question you only need the textbox to allow only numbers.

user2568960 Over a year ago

Yeah just for this case (txtb.Text = "Leternjoftimi") I want the other textbox to be the maxlength = 10 and not to allow to write othercharacters than numbers

HEEN Over a year ago

@user2568960: I guess, you should try enb081's solution

enb081 · Accepted Answer · 2015-04-27 14:51:48Z

1

You can add the validator from code behind. Try to do the following:

 Protected Sub txtIdType_TextChanged(sender As Object, e As EventArgs)
            Dim txtb As TextBox = CType(FormViewPerson.FindControl("txtIdType"), TextBox)
            Dim txtb1 As TextBox = CType(FormViewPerson.FindControl("TextBoxIDCode"), TextBox)

            If (txtb.Text = "Leternjoftimi" OrElse txtb.Text = "KosovoIDCard" OrElse txtb.Text = "Licna karta") Then

            txtb1.MaxLength = 10
            Dim validator As New RegularExpressionValidator()
            validator.ID = "validator" + New Random().[Next](100, 1000)
            validator.ControlToValidate = CType(FormViewPerson.FindControl("TextBoxIDCode"), TextBox).ID
            validator.ValidationExpression="^[0-9]*$"    
            FormViewPerson.Controls.Add(validator)

            End If

        End Sub

Suksese!

edited Apr 27, 2015 at 14:51

answered Apr 27, 2015 at 14:17

enb081

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6 Comments

enb081 Over a year ago

can you check in the browser if there is rendered a span with some ID that contains the validator word?

enb081 Over a year ago

See my edit: try changing Me.Controls.Add(validator) to FormViewPerson.Controls.Add(validator)

user2568960 Over a year ago

Thank you, but still it's not working, it allows me to write other characters not just numbers :S

enb081 Over a year ago

@user2568960 does it allow you to write more than 10 characters?

user2568960 Over a year ago

Yes when I add this piece of code from enb081 then it allos me to write more than 10. If I let the code how it was originally it doesnt allow me to write more than 10 characters

|

enb081 · Accepted Answer · 2015-04-29 12:12:21Z

1

I solved my problem using this function :

 For Each ch As Char In txt.Text
                If Not Char.IsDigit(ch) Then
                    txt.Text = ""
                    Exit Sub
                End If
            Next

edited Apr 29, 2015 at 12:12

enb081

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answered Apr 29, 2015 at 7:06

user2568960

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