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Join Date: Feb 2008
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Newbie Poster
I need to be able to limit the text entered into a text box, I need to make it so that only whole numbers can be entered and not decimal places. I have already limited it to just Numbers but need help with this. I think checking a box to see if a fullstop is in it would be a good way but i dont know the command for searching a string.
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Join Date: Jan 2008
Posts: 43
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Light Poster
to limit text box set its property "MaxLength" to number you want to enter like to 3 or 6.
to check decimal put condition
somthing like this...
if textbox1.text=Asc(.) then
msgbox("Please dont enter Decimal Point, Thanks")
endif
to check decimal put condition
somthing like this...
if textbox1.text=Asc(.) then
msgbox("Please dont enter Decimal Point, Thanks")
endif
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Join Date: Jan 2008
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Light Poster
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'Dim dt As Integer = Asc(Me.TextBox1.Text)
If TextBox1.Text = Chr(46) Then
MsgBox("You pressed dot")
End If
End Sub
this is one way you can check whether the dot is pressed or not
'Dim dt As Integer = Asc(Me.TextBox1.Text)
If TextBox1.Text = Chr(46) Then
MsgBox("You pressed dot")
End If
End Sub
this is one way you can check whether the dot is pressed or not
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Join Date: Nov 2007
Location: � Jogja �
Posts: 2,585
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try this following code, this code only allowed number entered on textbox :
vb Syntax (Toggle Plain Text)
Never tried = Never Know
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So, Please do something before post your thread.
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Join Date: Jan 2008
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Newbie Poster
Hi
Try the following code So that you can enter only the numbers not even any special characters.
try it in the textbox keypress event
Private Sub textbox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles tsum.KeyPress
If Asc(e.KeyChar) = 8 Then
Exit Sub
End If
If Asc(e.KeyChar) = 44 Then
e.Handled = True
End If
If Asc(e.KeyChar) < 48 Then
e.Handled = True
ElseIf Asc(e.KeyChar) > 57 Then
e.Handled = True
End If
End Sub
Try the following code So that you can enter only the numbers not even any special characters.
try it in the textbox keypress event
Private Sub textbox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles tsum.KeyPress
If Asc(e.KeyChar) = 8 Then
Exit Sub
End If
If Asc(e.KeyChar) = 44 Then
e.Handled = True
End If
If Asc(e.KeyChar) < 48 Then
e.Handled = True
ElseIf Asc(e.KeyChar) > 57 Then
e.Handled = True
End If
End Sub
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Join Date: Jan 2008
Posts: 65
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Junior Poster in Training
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Originally Posted by Wilderness Bob 
I need to be able to limit the text entered into a text box, I need to make it so that only whole numbers can be entered and not decimal places. I have already limited it to just Numbers but need help with this. I think checking a box to see if a fullstop is in it would be a good way but i dont know the command for searching a string.
You could also use the IsNumeric to insure all numbers and then check for the (.) as the other answer stated.
The MaxLength function will limit the number of characters.
You could also use code to check on keydown event if the character being enter is a number or period. If the period is captured, trigger a messagebox event and remove the period and reset the focus at the end of the numeric string.
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Join Date: Nov 2007
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Newbie Poster
just try this if will help you find if you type dot in the textbox
If TextBox1.Text.Contains(".") Then
MsgBox("true")
Else
MsgBox("true")
End If
If TextBox1.Text.Contains(".") Then
MsgBox("true")
Else
MsgBox("true")
End If
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Join Date: Jan 2008
Posts: 65
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Solved Threads: 4
Junior Poster in Training
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Originally Posted by suganzeni
Hi
Try the following code So that you can enter only the numbers not even any special characters.
try it in the textbox keypress event
Private Sub textbox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles tsum.KeyPress
If Asc(e.KeyChar) = 8 Then
Exit Sub
End If
If Asc(e.KeyChar) = 44 Then
e.Handled = True
End If
If Asc(e.KeyChar) < 48 Then
e.Handled = True
ElseIf Asc(e.KeyChar) > 57 Then
e.Handled = True
End If
End Sub
If IsNumeric(TextBox1.Text) And TextBox1.Text.Contains(".") Then
MsgBox("True for .")
Else
MsgBox("False for .")
End If
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