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Enable only one whitespace in textbox.

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Join Date: Jul 2009

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vinnijain

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Enable only one whitespace in textbox.

Oct 8th, 2009

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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ddanbe

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Oct 8th, 2009

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.

Today is a gift, that's why it is called "The Present".
Make love, no war. Cave ab homine unius libri.
Danny

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vinnijain

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Oct 8th, 2009

•

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.

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sknake

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Oct 8th, 2009

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

 Help with Code Tags 
 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:

 Help with Code Tags 
 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;
    }

Scott Knake
Custom Software Development
Apex Software, Inc.

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vinnijain

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Oct 8th, 2009

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

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ddanbe

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Oct 8th, 2009

•

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

Today is a gift, that's why it is called "The Present".
Make love, no war. Cave ab homine unius libri.
Danny

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sknake

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Oct 8th, 2009

•

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

Scott Knake
Custom Software Development
Apex Software, Inc.

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vinnijain

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Junior Poster

Oct 12th, 2009

I am facing one problem in this code:

•

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

 Help with Code Tags 
 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.

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ddanbe

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Posting Virtuoso

Oct 12th, 2009

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?

Today is a gift, that's why it is called "The Present".
Make love, no war. Cave ab homine unius libri.
Danny

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avirag

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Posting Whiz in Training

#10

Oct 12th, 2009

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

 Help with Code Tags 
 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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