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TextBox Format

Posted on 2010-08-19
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Last Modified: 2013-11-14
Hi,
I have a textbox.
In this textbox, the user enters miles information. This would be a decimal. Right now he can enter any value
123.456 or 1234.56 or 12.3456
I want this to be restricted to 9 digits i did this by setting the max length to 9.
Now i want this to have only 2 decimals
the user should be entering the text in this format 123456.78
The digits to the left of decimal should not be greater than 6
Is there any way i can do this without using a masked text box?

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Question by:rowternet
6 Comments
 
LVL 27

Assisted Solution

by:nmarun
nmarun earned 125 total points
ID: 33477925
If this is a winforms application, you can add a handle to the keypressed event and then take control of what the user enters in the textbox.You can also do this for web applications, but you'll have to use javascript for that.Arun
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LVL 5

Assisted Solution

by:jijeesh
jijeesh earned 125 total points
ID: 33478109
Try using RegEx and refer below article
http://www.csharphelp.com/2006/04/masked-c-textbox-control/
0
 

Author Comment

by:rowternet
ID: 33478531
Hi nmarun,

I already have a key press event in place which prevetns the user from entering any junk character.
What i need is :
Whenever the user enters something it should take 2 decimals.
jijeesh:
I cannot change my controls at this point.

On the textbox there is a property called Precision adn i set it to 2 decimals.
But, it does not seem to do anything.
Any idea what this is for?



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LVL 17

Assisted Solution

by:Zhaolai
Zhaolai earned 125 total points
ID: 33478623
Add this code in your textbox's KeyDown event:


        Dim oTextBox As TextBox = CType(sender, TextBox)
        If oTextBox.Text.Contains(".") Then
            If e.KeyCode = Keys.Decimal Then
                e.SuppressKeyPress = True
                Exit Sub
            End If
            If oTextBox.Text Like "*.##" Then
                e.SuppressKeyPress = True
            End If
        End If

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LVL 18

Accepted Solution

by:
John (Yiannis) Toutountzoglou earned 125 total points
ID: 33481044
Alternative Method.
You already said that you are using Key_Press Event ....Put  e.Handled = DesiredFormat(sender, e.KeyChar)
and have no junk character..The Function Do what you want
Hope it helps


Public Function DesiredFormat(ByVal sender As System.Object, ByVal eChar As Char) As Boolean
        Dim CheckString As String = "0123456789."
        If CType(sender, TextBox).TextLength = 7 AndAlso Not CType(sender, TextBox).Text.Contains(".") And eChar <> vbBack Then
            Return True
        ElseIf CType(sender, TextBox).TextLength > 9 And eChar <> vbBack Then
            Return True
        ElseIf CType(sender, TextBox).TextLength < 6 AndAlso CType(sender, TextBox).Text.Contains(".") And eChar <> vbBack Then
            Return True
        Else
            If CheckString.IndexOf(eChar) > -1 OrElse eChar = vbBack Then
                If CType(sender, TextBox).Text.IndexOf(".") > -1 Then
                    If CType(sender, TextBox).TextLength - CType(sender, TextBox).Text.IndexOf(".") > 2 And eChar <> vbBack Then
                        Return True
                    End If
                End If

                If eChar = "." Then
                    If CType(sender, TextBox).Text.IndexOf(eChar) > -1 Then
                        Return True
                    Else
                        Return False
                    End If
                End If
                Return False
            Else
                Return True
            End If
        End If
    End Function

    Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        e.Handled = DesiredFormat(sender, e.KeyChar)
    End Sub

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Author Comment

by:rowternet
ID: 33618987
Hi,

I did not get a chance to look at this.
I will change it in a couple of days.

Thanks
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