Replacing keyboard input in textbox

  • Thread starter Thread starter Jo Segers
  • Start date Start date
J

Jo Segers

Hi,

How can I restrict the keyboard input in a textBox to 0..9? In the
keydown event KeyValue is get only. Where can I alter the keyboard input?

Mvg,
 
Jo,

Use the keyup event and than by instance the e.value
(Don't forget on by instance value 8 because that is the backspace).

I hope this helps,

Cor
 
Cor Ligthert schreef:
Jo,

Use the keyup event and than by instance the e.value
(Don't forget on by instance value 8 because that is the backspace).

I hope this helps,

Cor
Click to expand...
Hi Cor,

This is the code I use:

private void textBoxOrderid_KeyUp(object sender,
system.Windows.Forms.KeyEventArgs e)
{
if ((char)e.KeyValue < '0' || (char)e.KeyValue > '9' || e.KeyValue == 8)
{
e.Handled = true;
}
}

I only want the keys 0 to 9 to appear in the textbox. However the method
above does not work.

Any other suggestions?


Jo.
 
Override TextBox class like following :

class TextBoxNum:TextBox {
private String _Text="";
private Regex regex=new Regex("^[0-9]*$",RegexOptions.Compiled);
protected override void OnTextChanged(EventArgs e) {
if (Text==_Text) return ;//Don't recurs
if (regex.Match(Text).Success) _Text=Text;
else {
int pos=SelectionStart+_Text.Length-Text.Length;
Text=_Text;
SelectionStart=pos<0?0:pos;
}
}
}
}



And declare in your code textBoxOrderid as a TextBoxNum :
TextBoxNum textBoxOrderid


Hope it helps,

Ludovic SOEUR.
 
Jo,

Is it not something more as this that you want.
{
if ((char)e.KeyValue < '0' || (char)e.KeyValue > '9' || e.KeyValue == 8)
{
Click to expand...

textBox1.SelectionStart = (int)textBox1.Text.Length - 1;
textBox1.SelectionLength = 1;
e.Handled = true;
}
}
Click to expand...

Be aware that you should use the validating event as well to check that
nobody paste something wrong in, or set the property that allows that to
false.

I hope this helps,

Cor
 
Cor Ligthert schreef:
Jo,

Is it not something more as this that you want.




textBox1.SelectionStart = (int)textBox1.Text.Length - 1;
textBox1.SelectionLength = 1;




Be aware that you should use the validating event as well to check that
nobody paste something wrong in, or set the property that allows that to
false.

I hope this helps,

Cor
Click to expand...
Thanks a lot for the usefull information.

Yours sincerely,

Jo Segers.
 
Override TextBox class like following :

class TextBoxNum:TextBox {
private String _Text="";
private Regex regex=new Regex("^[0-9]*$",RegexOptions.Compiled);
protected override void OnTextChanged(EventArgs e) {
if (Text==_Text) return ;//Don't recurs
if (regex.Match(Text).Success) _Text=Text;
else {
int pos=SelectionStart+_Text.Length-Text.Length;
Text=_Text;
SelectionStart=pos<0?0:pos;
}
}
}
}



And declare in your code textBoxOrderid as a TextBoxNum :
TextBoxNum textBoxOrderid


Hope this helps,

Ludovic SOEUR.
 
Ludovic SOEUR schreef:
Override TextBox class like following :

class TextBoxNum:TextBox {
private String _Text="";
private Regex regex=new Regex("^[0-9]*$",RegexOptions.Compiled);
protected override void OnTextChanged(EventArgs e) {
if (Text==_Text) return ;//Don't recurs
if (regex.Match(Text).Success) _Text=Text;
else {
int pos=SelectionStart+_Text.Length-Text.Length;
Text=_Text;
SelectionStart=pos<0?0:pos;
}
}
}
}



And declare in your code textBoxOrderid as a TextBoxNum :
TextBoxNum textBoxOrderid


Hope this helps,

Ludovic SOEUR.
Click to expand...

Thanks for all the information. I got it working the following way:

private void textBoxOrderid_TextChanged(object sender, System.EventArgs e)
{
string temp = textBoxOrderid.Text;
string newval = "";
for (int i = 0; i < temp.Length; i++)
{
if (temp >= '0' && temp <= '9')
{
newval += temp;
}
}
if (temp != newval)
{
textBoxOrderid.Text = newval;
textBoxOrderid.SelectionStart = textBoxOrderid.Text.Length;
}
}

Any remarks?

Jo.
 
OK, that's nearly the same but you should keep Regex instead of your loop if
you need efficiency.

Jo Segers said:
Ludovic SOEUR schreef:
Override TextBox class like following :

class TextBoxNum:TextBox {
private String _Text="";
private Regex regex=new Regex("^[0-9]*$",RegexOptions.Compiled);
protected override void OnTextChanged(EventArgs e) {
if (Text==_Text) return ;//Don't recurs
if (regex.Match(Text).Success) _Text=Text;
else {
int pos=SelectionStart+_Text.Length-Text.Length;
Text=_Text;
SelectionStart=pos<0?0:pos;
}
}
}
}



And declare in your code textBoxOrderid as a TextBoxNum :
TextBoxNum textBoxOrderid


Hope this helps,

Ludovic SOEUR.
Click to expand...

Thanks for all the information. I got it working the following way:

private void textBoxOrderid_TextChanged(object sender, System.EventArgs e)
{
string temp = textBoxOrderid.Text;
string newval = "";
for (int i = 0; i < temp.Length; i++)
{
if (temp >= '0' && temp <= '9')
{
newval += temp;
}
}
if (temp != newval)
{
textBoxOrderid.Text = newval;
textBoxOrderid.SelectionStart = textBoxOrderid.Text.Length;
}
}

Any remarks?

Jo.
Click to expand...
 
Back
Top