I have the following user control in my project simply
for setting focus to a control:
Public Class SetFocus
Inherits System.Web.UI.U serControl
Public Sub Focus(ByVal strClientID As String)
Dim script As String = ""
script = "<SCRIPT languange='Java Script'>" & _
"document.getEl ementById('" & _
strClientID & "').focus() ;" & _
"</SCRIPT>"
Page.RegisterSt artupScript("fo cus", script)
End Sub
I have the following code in my HTML section of the aspx
page that tries to access this user control:
<%@ Register TagPrefix="YTCI WebUserControls "
TagName="SetFoc us" Src="../UserControls/SetFocus.ascx" %>
..
..
..
<YTCIWebUserCon trols:SetFocus id="SetFocus1"
runat="server"> </YTCIWebUserCont rols:SetFocus>
I have the following code in my code-behind section of
the aspx page that tries to access this user control:
Protected ucFocus As New YTCIWebUserCont rols.SetFocus
..
..
..
If Not Page.IsPostBack Then
ucFocus.Focus(m tbFromDate.Clie ntID)
End If
When I try and run the page, I get the following error:
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the
execution of the current web request. Please review the
stack trace for more information about the error and
where it originated in the code.
Exception Details: System.NullRefe renceException: Object
reference not set to an instance of an object.
Source Error:
Line 33: If Not Page.IsPostBack Then
Line 34: ucFocus.Focus(m tbFromDate.Clie ntID)
Source File:
C:\Inetpub\wwwr oot\EmsAssist\R eports\MemberCa ll.aspx.vb
Line: 34
Stack Trace:
[NullReferenceEx ception: Object reference not set to an
instance of an object.]
YTCIWebUserCont rols.SetFocus.F ocus(String strClientID)
EmsAssist.Membe rCall.Page_Load (Object sender, EventArgs
e) in
C:\Inetpub\wwwr oot\EmsAssist\R eports\MemberCa ll.aspx.vb:35
System.Web.UI.C ontrol.OnLoad(E ventArgs e) +67
System.Web.UI.C ontrol.LoadRecu rsive() +35
System.Web.UI.P age.ProcessRequ estMain() +731
However, when I don't use the user control, and implement
the code from the user control in place of using the user
control everything works fine as indicated below:
If Not Page.IsPostBack Then
Dim intRandomNbr As Integer
Dim script As String = ""
script = "<SCRIPT languange='Java Script'>" & _
"document.getEl ementById('" & _
mtbFromDate.Cli entID & "').focus() ;"
& _
"</SCRIPT>"
intRandomNbr = GenerateRandomN br()
Page.RegisterSt artupScript("fo cus" &
intRandomNbr, script)
End If
What am I doing wrong that the user control can't be
used???
2  2148 
I believe you have to set the instance of ucFocus to
..FindControl(" <your control name>"), then I believe it will work as
planned.
On Wed, 11 Aug 2004 16:56:04 -0700, "bill" <ws********@msn .com> wrote: I have the following user control in my project simply
for setting focus to a control:
Public Class SetFocus
Inherits System.Web.UI.U serControl
Public Sub Focus(ByVal strClientID As String)
Dim script As String = ""
script = "<SCRIPT languange='Java Script'>" & _
"document.getEl ementById('" & _
strClientID & "').focus() ;" & _
"</SCRIPT>"
Page.RegisterSt artupScript("fo cus", script)
End Sub
I have the following code in my HTML section of the aspx
page that tries to access this user control:
<%@ Register TagPrefix="YTCI WebUserControls "
TagName="SetFo cus" Src="../UserControls/SetFocus.ascx" %>
.
.
.
<YTCIWebUserCo ntrols:SetFocus id="SetFocus1"
runat="server" ></YTCIWebUserCont rols:SetFocus>
I have the following code in my code-behind section of
the aspx page that tries to access this user control:
Protected ucFocus As New YTCIWebUserCont rols.SetFocus
.
.
.
If Not Page.IsPostBack Then
ucFocus.Focus(m tbFromDate.Clie ntID)
End If
When I try and run the page, I get the following error:
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the
execution of the current web request. Please review the
stack trace for more information about the error and
where it originated in the code.
Exception Details: System.NullRefe renceException: Object
reference not set to an instance of an object.
Source Error:
Line 33: If Not Page.IsPostBack Then
Line 34: ucFocus.Focus(m tbFromDate.Clie ntID)
Source File:
C:\Inetpub\www root\EmsAssist\ Reports\MemberC all.aspx.vb
Line: 34
Stack Trace:
[NullReferenceEx ception: Object reference not set to an
instance of an object.]
YTCIWebUserCon trols.SetFocus. Focus(String strClientID)
EmsAssist.Memb erCall.Page_Loa d(Object sender, EventArgs
e) in
C:\Inetpub\www root\EmsAssist\ Reports\MemberC all.aspx.vb:35
System.Web.UI. Control.OnLoad( EventArgs e) +67
System.Web.UI. Control.LoadRec ursive() +35
System.Web.UI. Page.ProcessReq uestMain() +731
However, when I don't use the user control, and implement
the code from the user control in place of using the user
control everything works fine as indicated below:
If Not Page.IsPostBack Then
Dim intRandomNbr As Integer
Dim script As String = ""
script = "<SCRIPT languange='Java Script'>" & _
"document.getEl ementById('" & _
mtbFromDate.Cli entID & "').focus() ;"
& _
"</SCRIPT>"
intRandomNbr = GenerateRandomN br()
Page.RegisterSt artupScript("fo cus" &
intRandomNbr , script)
End If
What am I doing wrong that the user control can't be
used???
Ed I don't know why this works but it does - I was having the same
problem and page.findcontro l("myusercontro lname") added to the
beginning of the subroutine where I was calling the property of the
user control from made my whole control spring to life :)
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