text box problems..

[obair2]

I am a beginner at making programs.
I am learning visual basic bymyself . I was making a conversion program and i wanted only numericals should be entered into the textbox. Can anyone please answer in brief.

[BSOB]

i think there is a way to limit the things that are put into a text box with text1.dataformat but what ive always used is:

text1_lostfocus()
text1.text = val(text1.text)
end sub

ins>outs:
k>0
1.3>1.3
k2>0
3.90k>3.9
3 2>3
(im using k as a random letter representing any text that is not numerical)

[sashi]

Hi there,

i would suggest to use the IsNumeric function by means to validate numeric data instead of Val function.. :)

  If IsNumeric(text1.text) = False Then
    ..  some message here ..
  EndIf
 

[Mahesh_Bote]

If IsNumeric(text1.text) = True[u] Then
.. some message here ..
End If

sashi, questioner want to enter only numeric values. so make a little bit change

Mahesh

[Stampy]

You may also want to try just using the maskedtextbox control instead of the textbox. This control has a mask property that you can customize to only allow numeric input, zip code/ telephone number formats, etc.

[sashi]

Hi Mahesh,

i understood the question clearly as it sounds.. IsNumeric function will help when it comes to datatype validation.. if numeric data is entered proceed with the nextstep or else prompt an error message asking the input to be corrected.. :)

[BSOB]

ive always tried not to bother my users with messaging telling them they are incompitant. they usualy already know that. i use val, so if they enter bad data, it goes to a default zero or null. the default value can be changed in code as desired. or, the default could be to clear the feild to let them know the data has not been set:
if str(val(text1)) <> text1 then text1 = ""

[gman_00ph]

this one filters the textbox from any non-numerical values:
"If IsNumeric(text1.text) = false then..."

this one filters the keypress in the textbox: (you can press backspace and enter)
Private Sub Text1_KeyPress(KeyAscii As Integer)
If KeyAscii >= 58 Or (KeyAscii <= 47 And KeyAscii <> 8 And KeyAscii <> 13)_
Then
KeyAscii = 0
End If
End Sub

hope that help you...

[JWL48]

You may also want to try just using the maskedtextbox control instead of the textbox. This control has a mask property that you can customize to only allow numeric input, zip code/ telephone number formats, etc.

Great reply!!! The "normal textbox" DataFormat seems to be very weakly implemented. Why butt your head against it when the other control is begging to be used! Thanks again - and a free cold "cyber beer" to you!