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Oct 8th, 2009

Enable only one whitespace in textbox.

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Can anyone tell me how can I enable one and only one whitespace to be entered in the textbox such that user can press spacebar only once while entering the string in the textbox and not more than once...........

Kindly provide me some solution.............

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vinnijain

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Oct 8th, 2009

Re: Enable only one whitespace in textbox.

This snippet http://www.daniweb.com/code/snippet217265.html allows you to enter only one decimal point. It should be easy adaptable to what you want.

ddanbe

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Oct 8th, 2009

Re: Enable only one whitespace in textbox.

Click to Expand / Collapse Quote originally posted by ddanbe ...

This snippet http://www.daniweb.com/code/snippet217265.html allows you to enter only one decimal point. It should be easy adaptable to what you want.

I think you haven't read the post properly.
I am talking about whitespace (enabling spacebar to be pressed once ) not the decimal.

vinnijain

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Oct 8th, 2009

Re: Enable only one whitespace in textbox.

This will block a double space, ie: "a<space><space>b" but allow "a<space>b<space>c":

C# Syntax (Toggle Plain Text)
    private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
    {
      TextBox tb = (TextBox)sender;
      if ((e.KeyChar == ' ') && (tb.Text.Length > 0))
      {
        if (tb.Text[tb.Text.Length - 1] == ' ')
          e.Handled = true;
      }      
    }
    private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
    {
      TextBox tb = (TextBox)sender;
      if ((e.KeyChar == ' ') && (tb.Text.Length > 0))
      {
        if (tb.Text[tb.Text.Length - 1] == ' ')
          e.Handled = true;
      }      
    }

To allow only a single space:

C# Syntax (Toggle Plain Text)
    private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
    {
      TextBox tb = (TextBox)sender;
      if ((e.KeyChar == ' ') && (tb.Text.Contains(' ')))
        e.Handled = true;
    }
    private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
    {
      TextBox tb = (TextBox)sender;
      if ((e.KeyChar == ' ') && (tb.Text.Contains(' ')))
        e.Handled = true;
    }

sknake

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Oct 8th, 2009

Re: Enable only one whitespace in textbox.

Thanks a lot...........
It worked.

vinnijain

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Oct 8th, 2009

Re: Enable only one whitespace in textbox.

Quote originally posted by vinnijain ...

I think you haven't read the post properly.
I am talking about whitespace (enabling spacebar to be pressed once ) not the decimal.

I think there is a misunderstanding here between to non native English speaking persons. By whitespace, I understand any character that you don't see on the screen. A tab character is whitespace for instance. You seem to think(correct me if I'm wrong) that hitting the spacebar produces whitespace. Wrong! It produces a space character which is considered whitespace. So I thought my suggestion (by adapting it) would provide you with an answer. But perhaps you did not read my answer to it's full extent

ddanbe

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Oct 8th, 2009

Re: Enable only one whitespace in textbox.

Click to Expand / Collapse Quote originally posted by ddanbe ...

I think there is a misunderstanding here between to non native English speaking persons. By whitespace, I understand any character that you don't see on the screen. A tab character is whitespace for instance. You seem to think(correct me if I'm wrong) that hitting the spacebar produces whitespace. Wrong! It produces a space character which is considered whitespace. So I thought my suggestion (by adapting it) would provide you with an answer. But perhaps you did not read my answer to it's full extent

I looked at your code snippet to see which event to handle because I knew one of the events still processed the key if you set .handled = true

So I adapted your snippet to the code I posted

sknake

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Oct 12th, 2009

Re: Enable only one whitespace in textbox.

I am facing one problem in this code:

Quote ...

This will block a double space, ie: "a<space><space>b" but allow "a<space>b<space>c":

C# Syntax (Toggle Plain Text)
C# Syntax (Toggle Plain Text)
 
      private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
         TextBox tb = (TextBox)sender;
         if ((e.KeyChar == ' ') && (tb.Text.Length > 0))
         {
         if (tb.Text[tb.Text.Length - 1] == ' ')
         e.Handled = true;
         }
         }
C# Syntax (Toggle Plain Text)

      private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
         TextBox tb = (TextBox)sender;
         if ((e.KeyChar == ' ') && (tb.Text.Length > 0))
         {
         if (tb.Text[tb.Text.Length - 1] == ' ')
         e.Handled = true;
         }
         }

Problem is that when I am going backspace or when I am moving backwards using arrowkeys , in that case spacebar is disabled. Not even a single space is enabled.
Kindly provide some solution..........

Last edited by vinnijain; Oct 12th, 2009 at 1:54 am.

vinnijain

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Oct 12th, 2009

Re: Enable only one whitespace in textbox.

Suggest you revisit the code snippet I gave you.
Change all the code that handles a decimal point into code that handles a space. If you like to input letters instead of numbers more changes are needed, but all this cannot be that hard to accomplish, now is it?

ddanbe

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Oct 12th, 2009

Re: Enable only one whitespace in textbox.

Hello vinnijain.........
try this on textBox1_TextChanged event........

C# Syntax (Toggle Plain Text)
 TextBox t = (TextBox)sender;
            int index = t.Text.IndexOf("  ");
            while (index != -1) {
                t.Text =  t.Text.Replace("  ", " ");
                index = t.Text.IndexOf("  ");
            }
            t.SelectionStart = t.Text.Length;
 TextBox t = (TextBox)sender;
            int index = t.Text.IndexOf("  ");
            while (index != -1) {
                t.Text =  t.Text.Replace("  ", " ");
                index = t.Text.IndexOf("  ");
            }
            t.SelectionStart = t.Text.Length;

Hope it help you...........

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