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Unable to find textbox keypress event in ASP.NET

Posted on 2004-03-26
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Last Modified: 2011-08-18
I want to trap the keypress event of a textbox in a web page developed in ASP.NET. How will I do it.
 
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Question by:sam78_my
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6 Comments
 
LVL 4

Accepted Solution

by:
JNSTAUB earned 168 total points
ID: 10685996
it may be:
<asp:TextBox onTextChanged="myTextHandler" runat="server" />
or a client script
post back at each keystrokes is bandwidth consumming!!!
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LVL 1

Assisted Solution

by:youroun
youroun earned 166 total points
ID: 10686515
as above, you could add a server event to detect key press, wouldn't do that, cuz it's bandwith consuming...
It's better to add client side code, in order for it to work though, you have to add the client event in your server script:

private void Page_Load(object sender, System.Eventargs e)
{
   textBox1.Attributes.Add("onkeypress", "javascriptFunctionHere()");
}

and in your client page add the function:

<script language=javascript>
   function javascriptFunctionHere()
   {
      alert('do something here, like show this message');
   }
</script>

client side script works most of the time, can't see of any reason why to do a postBack on every keypress ...
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LVL 35

Assisted Solution

by:YZlat
YZlat earned 166 total points
ID: 10686704
Sub Page_Load( ByVal sender As System.Object, ByVal e As System.EventArgs)
            txtTextbox.Attributes.Add("onKeyPress", _
                  "JavaScript:HandleOnKeyPress()")
End Sub
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