get value from javascript to web control

In my page I have label control

<asp:label id="Label1" runat="server" />

when page load I set that label value using javascript

function setvalue() {
document.getElementById("Label1").innerHTML = "hello"
<body onLoad="setvalue();">

and i also have a button. When I click that button, it read the label value

Private Sub BtnSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnSubmit.Click
Dim a as string = Label1.Text
end sub

but the problem is variable a always empty or ""
How to solve it?
3/30/2004 6:38:13 AM 24353 articles. 1 followers. Follow

5 Replies

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1. Asp:Label to Asp:TextBox
2. document.getElementById("Label1").innerHTML = "hello" to document.getElementById("Textbox1").value= "hello"
3. Dim a as string = Label1.Text to Dim a as string = Textbox1.Text
3/30/2004 8:59:39 AM
first the server tags get fired and then the javascript tags.

hence, when u click on the button the page goes for post back and so first server work is done and then it goes for client side.
u cannot keep the previous values of labels after the postback.
If u must require it to do so, then u try using a hidden variable.
when u assign value to a label u assign value to hidden variable also.
in the button click u can access the label value through the hiddden variable value as they both are same.
hidden varibale keeps up its value even after postback also.
this is somewhat tiresome
if u can give me ur requirement exactly at what place,
i can give u an easy solution.

3/30/2004 9:24:37 AM
here the example

<script language="javascript">
function init() {
document.getElementById("Label1").innerHTML = "hohoho.. label" ;
document.getElementById("TextBox1").value = "hohoho.. textbox" ;

<body onload="init();">
<form id="Form1" method="post" runat="server">
<br><asp:Label ID="Label1" Runat="server" />
<br><asp:TextBox ID="TextBox1" Runat="server" />
<br><asp:Button ID="Button1" Runat="server" Text="Submit" />
<br><asp:Label ID="Label2" Runat="server" />

here is the code behind

Public Class test
Inherits System.Web.UI.Page
Protected WithEvents Label1 As System.Web.UI.WebControls.Label
Protected WithEvents Button1 As System.Web.UI.WebControls.Button
Protected WithEvents TextBox1 As System.Web.UI.WebControls.TextBox
Protected WithEvents Label2 As System.Web.UI.WebControls.Label
#Region " Web Form Designer Generated Code "
... cut.. cut...
#End Region
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Label2.Text = Label1.Text & TextBox1.Text
End Sub
End Class

in this condition. Label1.Text always empty
Actually I can solve my problem by replacing Label with Textbox, but I (and all of us) want to know your easy solution
3/31/2004 3:14:57 AM
try this.

i think we need the use of hidden variable.

<script language="javascript">
function funinit()

<body MS_POSITIONING="GridLayout" onload="javascript:funinit();">
<form id="Form1" method="post" runat="server">
<asp:Label ID="label1" Runat="server"></asp:Label><br>
<asp:textbox ID="text1" Runat="server"></asp:textbox><br>
<asp:Label ID="label2" Runat="server"></asp:Label><br>
<asp:Button ID="btnSubmit" Text="Submit" Runat="server"></asp:Button>
<input type="hidden" runat="server" id="hdnText">

3/31/2004 6:32:23 AM
hm... that is better and more flexible

4/1/2004 2:50:47 AM

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