get the changed value of a text box - client side

Hello everybody!

I have this in the server side:
<asp:textbox id="TEscala" runat="server"></asp:textbox>
<asp:imagebutton id="BIrEscala" runtat="server" imageurl="images/irmapa.gif"> </asp:imagebutton>
And i want to do this:
Private Sub BIrEscala_Click(ByVal sender As System.Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles BIrEscala.Click
Dim xx As String
xx = Tescala.value
End Sub
The problem is that "xx" doesn´t get the new value written in the text box.
I know that i can get the value using Javascript , but i need that value to use it in the aspx.vb code.
how can i do it?
3/18/2004 10:40:48 AM 24353 articles. 2 followers. Follow

9 Replies

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I think that the problem is that the form has been posted and the Page_Load function has been executed, then the textbox's value has been emptied.

Maybe you can use the Request.Form ?
(but then I think you have to get the clientId on the textbox, which can differ from the server-side ID)
3/18/2004 11:51:52 AM
There is no value property for a Textbox. You need to use the text property.

Dim xx As String
xx = Textbox.Text
3/18/2004 1:29:10 PM

I 've writed wrong the message.
in the code i have:
Dim xx As String
xx = Textbox.Text
Magnus , i dont understand you about how can i get the clientId on the textbox?
3/18/2004 1:47:00 PM
I know that i can do it with JavaScript in the client side, changing

<asp:input ... to <input ..
<asp:button ... to <button .... onclick=getvalue();
and in the function getvalue(), i can call the aspx form passing the value, but this will reload aspx the page , isn't it?
And i don't want reload the page.
Any idea?
Thanks in advance.
3/18/2004 3:00:24 PM
Your original post works fine for me. 

Just for clarification I have the following in the .aspx page:
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm1.aspx.vb" Inherits="Test.WebForm1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="Visual Basic .NET 7.1" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="" name="vs_targetSchema">
<form id="Form1" method="post" runat="server">
<asp:TextBox id="TEscala" runat="server"></asp:TextBox>
<asp:ImageButton id="BIrEscala" runat="server"></asp:ImageButton></form>
And the following in the codebehind (.aspx.vb):
Public Class WebForm1
Inherits System.Web.UI.Page
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
End Sub
Protected WithEvents TEscala As System.Web.UI.WebControls.TextBox
Protected WithEvents BIrEscala As System.Web.UI.WebControls.ImageButton
'NOTE: The following placeholder declaration is required by the Web Form Designer.
'Do not delete or move it.
Private designerPlaceholderDeclaration As System.Object
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
End Sub
#End Region
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'Put user code to initialize the page here
End Sub
Private Sub BIrEscala_Click(ByVal sender As System.Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles BIrEscala.Click
Dim xx As String
xx = TEscala.Text.ToString()
End Sub
End Class
3/18/2004 11:53:06 PM
It doesn't work for me.

I have the code as yours.
Do you get written a the new value of the textbox?. I get the old value.
Supose that the page is loaded.
And the text box value is: "180.00".
Now i change the value to e.g. "30.00", and when i click the botton y get a "180.00", The old value.
I think that it is because is a server control and to change to value the page need to be reloaded. But i would like get the new value without reload the page. Is it posible?
Thanks in advance.
3/22/2004 7:58:25 AM
Are you sure you're not re-initializing the value somewhere in your codebehind?
3/22/2004 12:29:20 PM

You are right.
I didn't noticed that the Page_Load(), executes befere BIrEscala_Click(), and in the Page_load i change the value too.
Thanks again.
3/22/2004 2:22:43 PM

Also, you should notice that the readonly property will reset a textbox at pageload.

Have a look here

 Essentially it's about adding the readonly property at run-time e.g:

  if (!IsPostBack)
            // make textbox read-only
            TextBox1.Attributes.Add("readonly", "readonly");


12/5/2007 11:42:33 AM

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