How do I make numeric keypad for a touch screen application that maintains its cursor position?

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I am making a numeric keypad for touch screen using C# and ASP.NET, allowing an user to enter the pin number of size 4 for login.
When the user touches on a particular number, it should appear in a text box but as a *. For this, I have used hidden field that tracks number entered by user and in the text box a * is shown every time the user touches any number.
What I would like is that the cursor position is maintained and is moved according the entry.
Everything works fine but I need the cursor position to be maintained in it.

Here is code when 7 is pressed:

C#

protected void lnkNumberPadSeven_Click(object sender, EventArgs e)
  {
      string num = lnkNumberPadSeven.CommandArgument;
      if (txtPassword.Text.Length <= 3)
      {
          txtPassword.Text = string.Concat(Server.HtmlEncode(txtPassword.Text.ToString()), "*");
          hdnPassword.Value = string.Concat(hdnPassword.Value, num);
      }
  }

Can anyone help.. ??

Posted 25-Jan-14 22:41pm

Codes DeCodes

Updated 25-Jan-14 23:04pm

André Kraak

v3

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JoCodes 27-Jan-14 0:03am

You can use TextMode="Password" for the textbox .

Codes DeCodes 27-Jan-14 3:30am

thanks for the code jocodes.. guess it works only when user types pin from keyboard.. in my case,, user selected the number and the number is concated... so in reference to above code for lnkNumberPadSeven_Click, as 7 is pressed on screen, 7 is shown insted of *..

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OriginalGriff · Answer 1 · 2014-01-25T23:05:00

Solution 1

Easiest way? Don't replace it yourself! If you set the TextBox.UseSystemPassword property to true, it will do it for you. Or, if you must use "*" characters, then leave UseSystemPassword at false, as set TextBox.Password Char to '*' and it will use that instead.

If you really, really, must do it yourself, then I think what you really want to do is just add the line:

C#

txtPassword.Focus();

to your method above.

Posted 25-Jan-14 23:05pm

OriginalGriff

Comments

Codes DeCodes 26-Jan-14 6:05am

i could not get u ... i could not access TextBox.UseSystemPassword property.. where is it located ???

OriginalGriff 26-Jan-14 6:27am

Look in the properties pane for your textbox control...