textbox changed event

[jonathandrott]

hi,

I'm trying to update a label with the text in a textbox as the user
types in the information.

something like this is not working:

Protected Sub TextBox1_TextChanged(ByVal sender As Object, ByVal e As
System.EventArgs)

label1.text = me.textbox1.text

End Sub

I want to update the label for every key stroke.

 

[Teemu Keiski]

Using JavaScript for that would be better than postbacking on every letter.

 

[Rad [Visual C# MVP]]

I suggest you do this from the client side .. it is much more
efficient in terms of resources and certainly much faster.

On page load add this code:

if(!Page.IsPostBack)
TextBox1.Attributes.Add("onChange","label1.value=textbox1.value");

 

[jonathandrott]

i'm using the new ajax extensions to update the events. resources are
not a problem. this is being used for a specific purpose. is it
possible to change the label with each keystroke?
this is being done in visual web developer 2005.

 

[David Wier]

The problem, though, is that the textChanged event only fires once the focus
is lost from the TextBox.

 

[Rad [Visual C# MVP]]

I'm not sure if that is possible using the current implementation of
asp.net.

The textchanged event fires when the text as a whole changes, not when
a character in the textbox changes.

You might have to do a little more work to achieve what you're lookng
for.

I suspect you might have to write a client side javascript function to
handle the keydown event and in that function submit the form.

Still, the latency of this approach is likely to be an issue

 

[jonathandrott]

yes, now you understand the problem i'm running into. is there an easy
way to change this?

 

[Guest]

hi,
call a javascript method with page registerstartupscript method
with the object which you want to focus() at startup.

Page.RegisterStartupScript("focus","<script>SetFocus('"+txtbox1.ClientID+"');");

function SetFocus(obj)
{
document.getElementById(obj).focus();
}

Asp.net isnt only a server side programing. you should have to use
javascript for developing web apps.