How to Create an On Key Press Event in Visual Studio 2005

Hi,

I have created a web form in visual Studio 2005. There is a comments text box which I have limited to 500 characters. I would like to display another textbox or label that shows how many characters remain until the max character limit is reached. Every time a character is entered I would like to have the textbox that is counting the characteres be updated. how can I do this using VB?

I am new to VB. Any help would be appreciated.

Thanks!
D-bass

Visual Basic.NETASP.NET

Last Comment

D-bass

8/22/2022 - Mon

GreymanMSC

4/14/2008

You do not.

All VB code is handled on the Server side. This is processed only when a page is posted to the browser. You do not want to postback every time you press a key.

You'll need to use Client side scripting to handle such activity; such as VBScript or Javascript.

<script type="text/javascript">
document.onkeyup = KeyCheck;       
function KeyCheck(e)
{
  var txt = document.getElementByID('<%= Me.EntryTextBox.ClientID %>;').getAttribute("value");
  document.getElementByID('<%= Me.CountTextBox.ClientID %>').setAttribute("value", txt.length);
}
</script>

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D-bass

4/15/2008

ASKER

I was not able to get this code to work. Here is what I have.

<script type="text/javascript">
document.onkeyup = KeyCheck;
function KeyCheck(e)
{
var txt = document.getElementByID('<%= Me.Comments.ClientID %>;').getAttribute("value");
document.getElementByID('<%= Me.Textbox3.ClientID %>').setAttribute("value", txt.length);
}
</script>
Any sugestions?

ASKER CERTIFIED SOLUTION

D-bass

4/15/2008

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