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Adding text to a textbox and move down along the scrollbar

Posted on 2007-11-25
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Last Modified: 2013-11-26
Hi,

I have a timer which add some text (information) to a textbox, and since the textbox is small, I would like it to automatically scroll the textbox down as text are being added. Is it possible?
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Question by:Sharalynn
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by:jpaulino
jpaulino earned 500 total points
ID: 20346582
You can do this to your multi-line textbox:

TextBox1.AppendText("my text")
TextBox1.ScrollToCaret()
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Author Comment

by:Sharalynn
ID: 20349173
Your code works, but however if I used:

TextBox1.Text &= "asfddf" & vbCrLf,

it will not focus on the textbox, and the caret will always be at the 0 position with text going down and down and the scrollbar getting longer and longer.. Any idea on how to solve that? Otherwise your code works perfectly fine.

What is the difference between the 2 of them anyway?
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jpaulino earned 500 total points
ID: 20349423
Hi Sharalynn,

That method causes textbox to loose the focus. To ScrollToCaret work you need to have focus and for that you will need to do this:

        TextBox1.Text &= "asfddf" & vbCrLf
        Dim txtLenght As Integer = Len(TextBox1.Text)
        TextBox1.Select(txtLenght, txtLenght)
        TextBox1.ScrollToCaret()

jpaulino
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by:jpaulino
jpaulino earned 500 total points
ID: 20349429
Just one more thing:

Dim txtLenght As Integer = Len(TextBox1.Text)
TextBox1.Select(txtLenght, txtLenght)

This will put the cursor in the last position on the textbox. If you use simply TextBox1.Select() will select all the text.
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Author Comment

by:Sharalynn
ID: 20349677
Excellent, I understand it totally now. Thank you jpaulino!

But one thing, you said we need to focus it, but since we used Select to go to the end of the line always, does it auto focus for us?
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by:jpaulino
jpaulino earned 500 total points
ID: 20351031
When you select the control in the last position you will focus him.

Any question more ?
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Author Comment

by:Sharalynn
ID: 20351043
Nope, you have answered all completely, thanks lots!
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Expert Comment

by:jpaulino
ID: 20351131
Glad I could help!
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