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Tab key movement within textbox in C#

Hi,

I am the beginner of the C# programming. I am doing a project now and customer has a special requirement for the moving rule of Tab key.

There are 8 textbox in a windows form, named for example textbox1, textbox2, �? textbox 8. The customer want to use the Tab key first move to textbox 1 then textbox 2, �?until textbox8, after that he want to jump back to textbox 3 by pressing Tab key and then do loop within textbox3, textbox4 and textbox8 with Tab key.

I only know how to do loop within all textbox1, �? textbox8, and I have no idea how to manage jump back to textbox3 and only do loop within textbox3, textbox4 and textbox8. Does anyone has this experience or any suggestions?

Thanks for your help!

/mhbj

mhbj

Hi,
When you reach the specific textbox.change the focus into textbox 1.i hope it will help you.

  private void textBox11_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode.Equals(Keys.Tab))
            {
                textBox1.Focus();
            }
        }

Best Regards, C.Gnanadurai ----------------------- Please mark the post as answer if it is helpfull to you

Marked As Answer bymhbj Wednesday, September 16, 2009 9:04 PM

Gnanadurai

set the TabIndex (from the property window of the textbox control) of textBox1-8 from 1 to 8.
Then use the method given by Ganadurai to bring the focus back to textBox3 from textBox8.

        private void textBox8_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode.Equals(Keys.Tab))
            {
                textBox3.Focus();
            }
        }

Hope this helps.

Paras

Marked As Answer bymhbj Wednesday, September 16, 2009 9:04 PM

paras kumar

Hi,
When you reach the specific textbox.change the focus into textbox 1.i hope it will help you.

  private void textBox11_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode.Equals(Keys.Tab))
            {
                textBox1.Focus();
            }
        }

Best Regards, C.Gnanadurai ----------------------- Please mark the post as answer if it is helpfull to you

Marked As Answer bymhbj Wednesday, September 16, 2009 9:04 PM

Gnanadurai

set the TabIndex (from the property window of the textbox control) of textBox1-8 from 1 to 8.
Then use the method given by Ganadurai to bring the focus back to textBox3 from textBox8.

        private void textBox8_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode.Equals(Keys.Tab))
            {
                textBox3.Focus();
            }
        }

Hope this helps.

Paras

Marked As Answer bymhbj Wednesday, September 16, 2009 9:04 PM

paras kumar

Thanks Gnanadurai and Paras. I tried your suggestions but it doesn't work :-(.
It still jump back from textbox8 to textbox1 by Tab key.
By the way, the textbox8 is actually a button not a textbox. And I sent these 8 items TabIndex 0-7.
Does these make it difference? (I think it should not...)

/Mei

mhbj

        void button1_LostFocus(object sender, EventArgs e)
        {
            this.textBox3.Focus();
        }

Paras

paras kumar

for each control that do not catch TAB key, override IsInputKey method :
Add following code.

        void button8_KeyUp(object sender, KeyEventArgs e)
        {
            this.textBox3.Focus();
        }

        void button8_KeyDown(object sender, KeyEventArgs e)
        {
            this.textBox3.Focus();
        }

        protected override bool IsInputKey(Keys keyData)
        {
            if (keyData == Keys.Tab) return true;
            return base.IsInputKey(keyData);
        }

Check this out :
http://social.msdn.microsoft.com/Forums/en-US/winforms/thread/5a578bc3-2f28-47f5-8058-80206735d4a8

Paras

paras kumar

Hi,

KeyUp works, but it is not what I need. I want to stay in button8 until user press down tab key, then jump to texbox3.
Using keyup, it will jump to textbox3 immediately andwill notstay on button8 at all.

Adding IsInputkey or not make no difference.

Any more suggestion? Thanks!

mhbj

I did not get you...
whenever user presses tab (when the focus is on button) the focus should go on textbox3 right??
you can use key up for that.

why I have written event handlerfor both keyup and key down because sometimes IsInputKey doesnot work with key down...
Check this out :
http://social.msdn.microsoft.com/Forums/en-US/winforms/thread/5a578bc3-2f28-47f5-8058-80206735d4a8

if you want to stay on button8 untill user press down tab key then you should not use keydown event, you should use keyup event only.

Hope this helps.

Paras

paras kumar

Hi paras,

I read some related links from web and finally found the problem. The button key is a little different with texbox. it needs PreviewKeyDown to help KeyDown event. I add the following code in my program and it works. Thanks for your help.

private void button8_KeyDown(object sender, KeyEventArgs e)
{
e.Handled = ProcessKeyDown(e.KeyCode);
}

private void button8_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
ProcessKeyDown(e.KeyCode);
}

private bool ProcessKeyDown(Keys keyCode)
{
if (keyCode == Keys.Tab)
{
textBox3.Focus();
return true;
}
return false;
}

mhbj

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