Hello All and Advanced Thanks For Replying,
OS: XP Pro
IDE: Visual Studio 2005
..net Framework: 2.0.....
Problem: Getting An Error When trying to implement the following
CallBack on a content page that uses a master page (Code From
Professional asp.net 2.0 Book)
Error:
/************************************************** *********************************/
Line: 163
Char: 13
Error:'document.forms.0.TextBox1' is null or not an object
Code: 0
URL: http://localhost:1325/WebSite4/Exper...WthMaster.aspx
/************************************************** *********************************/
Code Behind
/************************************************** ***********************************/
Partial Class Experiment_WthMaster
Inherits System.Web.UI.Page
Implements System.Web.UI.ICallbackEventHandler
Dim _callbackResult As String = Nothing
Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs) _
Handles Me.Load
Dim cbReference As String =
Page.ClientScript.GetCallbackEventReference(Me, "arg",
"GetRandomNumberFromServer", "context")
Dim cbScript As String = "function UseCallback(arg, context) {"
& cbReference & ";" & "}"
Page.ClientScript.RegisterClientScriptBlock(Me.Get Type(), _
"UseCallback", cbScript, True)
End Sub
Public Sub RaiseCallbackEvent(ByVal eventArgument As String)
Implements System.Web.UI.ICallbackEventHandler.RaiseCallbackE vent
_callbackResult = Rnd().ToString()
End Sub
Public Function GetCallbackResult() As String Implements
System.Web.UI.ICallbackEventHandler.GetCallbackRes ult
Return _callbackResult
End Function
End Class
/************************************************** ***********************************/
Code ASPX
/************************************************** ***********************************/
<%@ Page Language="VB" MasterPageFile="~/MasterPage.master"
AutoEventWireup="false" CodeFile="Experiment_WthMaster.aspx.vb"
Inherits="Experiment_WthMaster" title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1"
Runat="Server">
<script type="text/javascript">
function GetNumber(){
UseCallback();
}
function GetRandomNumberFromServer(TextBox1, context){
document.forms[0].TextBox1.Value = TextBox1;
}
</script>
<div>
<input id="Button1" type="button" value="Get Random Number"
onclick="GetNumber()" />
<br />
<br />
<asp:TextBox ID="TextBox1" Runat="server"></asp:TextBox>
</div>
</asp:Content>
/************************************************** ***********************/
Help REALLY Appreciated
Thanks
Farooq