AJAX :: Script Controls May Not Be Registered After PreRender?
Feb 3, 2011
I get this error on postback from using a dynamic created controls, specifically the
Ajax ComboBox. If I use DropDownList instead, then I don't get the error. How to over come this issue? I do need to use theAjax ComboBox because it allow extra properties not available in DropDownListHere is the complete error:Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Script controls may not be registered after PreRender.My ToolKitScriptManager resides in the MasterPage.
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Apr 23, 2010
I am using ajax tabpanel control. and i have fileupload control, gridview inside the tabpanel.if i select the file in fileupload control and click upload button it has to read the excel file data and bind the gridview.i debugged the code the dataset has the correct values and bind method also calling successfully.
but finaly in the screen shows this error message "Script controls may not be registered before PreRender."
what is the problem.
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Jun 2, 2010
Getting following error
System.InvalidOperationException: "Script controls may not be registered before PreRender."
On my masterpage i am using Docking Panel control to get collapsable/Expandable left area.
Its working fine but when i try to place an infragistic WebExplorerBar Control inside Docking Panel to get Outlook like view. It gives the above mentioned error.
Following is the code sample.
<xpro:DockingPanel
Text="Navigation" ID="DockingPanelTree" Docking="Left" runat="server"
Direction="RightToLeft"
Interval="0">.........
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Mar 8, 2011
I am creating Dynamic UserControls with Dynamic AjaxControls. Then I store each of the UserControls in a Collection. On Postback I recall the UserControls in the collection to Re-Create the interface. It works if i only use Standard HTML controls but does NOT work with AJAX controls. I get this error on PostBack Extender controls may not be registered after PreRender. So far I have tried the following:
MyBase.OnPreRender(e) in Page and Usercontrol EnsureChildControls() in the OnInit Added ScriptManager to the MasterPage None of this stuff is working... If I re-create all the controls including the ones inside the usercontrol then i get no error however it takes forever to do a postback as opposed to just recalling the collection of UserControls.
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Sep 19, 2010
I am currently trying to use Telerik. I am designing login control. But however I m getting this error :
[Code]....
I don't know how to resolve it, here is my Code :Aspx :
[Code]....
And this is C# :
[Code]....
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Mar 25, 2011
When creating dynamic ajax controls you may experience a pre-render issue on postbacks. You are supposed to re-create the controls on postback, however if there are very many of them performance gets very slow between each postback. i.e. clicking on a combobox, it may take several seconds. So what I did was group the controls in panels, store the panels in a collection, then re-call the panels on Postback. This actually works great if the controls inside the panel are standard html controls (textbox, dropdowlist, etc.). But...doesn't work well with ajax controls...yet.
I have included a sample below. Uncomment/Comment the code to test it.
[Code]....
[Code]....
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Mar 25, 2011
When creating dynamic ajax controls you may experience a pre-render issue on postbacks. You are supposed to re-create the controls on postback, however if there are very many of them performance gets very slow between each postback. i.e. clicking on a combobox, it may take several seconds. So what I did was group the controls in panels, store the panels in a collection, then re-call the panels on Postback. This actually works great if the controls inside the panel are standard html controls (textbox, dropdowlist, etc.). But...doesn't work well with ajax controls...yet.
I have included a sample below. Uncomment/Comment the code to test it. If anyone has a good idea how to make this work with ajax controls that would be great.
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="PreRenderAjax.WebForm1" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</asp:ToolkitScriptManager>
<div>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
</div>
</form>
</body>
</html>
Public Class WebForm1
Inherits System.Web.UI.Page
Shared panellist As New List(Of Panel)
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If IsPostBack Then
'This is for reloading panels. Works with dropdownlist, but not ajax combobox
For Each pn As Panel In panellist
PlaceHolder1.Controls.Add(pn)
Next
'This for re-creating all the controls again. Not very efficient for ajax controls though.
'CreateInterface()
Else
CreateInterface()
End If
End Sub
Protected Overrides Sub CreateChildControls()
MyBase.CreateChildControls()
End Sub
Protected Overrides Sub OnInit(ByVal e As System.EventArgs)
MyBase.OnInit(e)
EnsureChildControls()
End Sub
Private Sub CreateInterface()
Dim pn As Panel
pn = CreatePanel("panel1")
CreateControls(pn, 5)
pn = CreatePanel("panel2")
CreateControls(pn, 5)
pn = CreatePanel("panel3")
CreateControls(pn, 5)
pn = CreatePanel("panel4")
CreateControls(pn, 5)
End Sub
Private Function CreatePanel(ByVal name As String) As Panel
Dim pn As New Panel
pn.ID = name
pn.Width = 250
pn.BorderStyle = BorderStyle.Solid
pn.BorderColor = Drawing.Color.Blue
pn.Style.Add("margin", "5px")
pn.Style.Add("padding", "5px")
PlaceHolder1.Controls.Add(pn)
panellist.Add(pn)
CreatePanel = pn
End Function
Private Sub CreateControls(ByVal pn As Panel, ByVal howmany As Integer)
Dim cbo As AjaxControlToolkit.ComboBox
'Dim cbo As DropDownList
For i As Integer = 0 To howmany - 1
cbo = New AjaxControlToolkit.ComboBox
'cbo = New DropDownList
cbo.ID = pn.ID & "_cbo" & i
cbo.Width = 200
cbo.Items.Add("Item 1")
cbo.Items.Add("Item 2")
cbo.Items.Add("Item 3")
cbo.Items.Add("Item 4")
cbo.Items.Add("Item 5")
cbo.Style.Add("margin", "3px")
cbo.AutoPostBack = True
pn.Controls.Add(cbo)
Next
End Sub
End Class
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Mar 3, 2010
I have a control on a page. In the control's pre-render event I'm executing some code that's taking about a minute to execute. This means the whole page is unresponsive until the control's pre-render event is finished executing.I tried putting the control inside an update panel, but it doesn't matter the rest of the page still won't render until the pre-render event of the control is finished executing. I've attached a very simple example of my code (The event that's slowing up the control's pre-render event is not Thread.Sleep(1000):
[Code]....
[Code]....
[Code]....
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May 24, 2010
I am having the same problem for only one page in my site.
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Oct 16, 2010
I am getting this error on a simple page that has the following registration:
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>Additionally, I have the following in the MasterPage:
<cc1:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" EnablePageMethods="true" EnablePartialRendering="true"> </cc1:ToolkitScriptManager>
[code]...
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Dec 17, 2010
I have been led to believe that the best point to bind your controls is the PreRender. As all the controls are ready and this is the last stage before rendering etc. Is this correct or should controls be bound at a different point?
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Dec 20, 2010
I have a override Render method on my AccordionMenu.ascx.cs, basically just replace the <span></span> tag with <div></div> due to w3c compliance requirement, this is the c# code:
[Code]....
but when i try to run it, the page always throws an exception to me like this: Extender control 'MyAccordion_AccordionExtender' is not a registered extender control. Extender controls must be registered using RegisterExtenderControl() before calling. this is the context of my pages: accordion menu is placed in the content page, and the content page is inherited from a master page, the master page has a script manager.
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Jun 20, 2010
I am creating a custom control where I need to attach some javascript to it so that it can do stuff on the client side. When I try to use ScriptManager.RegisterStartupScript it errors out and tells me that the ScriptManager is not registered.
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Mar 24, 2010
Do you know any drawback to add controls to a page on PreRender event?
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Mar 7, 2010
I have a DetailsView on my page, bounded throught ObjectDS (but I think it's not important). Some field is readonly for some users - based on role membership and other paramaters. I've tried to use the PreRender event to manage these field's readonly state. Everything is working - except one template field: when I click first time on Edit button the dropdown list stay readonly independently the role membership. When I click on Cancel than Edit again the control state is good. Code of PreRender event handler:
[Code]....
Environment:Web Developer 2008 Express .NET Fw. 3.5 Windows XP
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Jan 8, 2010
At the first loading of my page, duration of PreRender takes upto 13 seconds. That page has basically a gridview control which bind to SqlServer query by SqlDataSource. When I execute query seperately, it takes only 0.02 second.
On the other hand, for the next loadings of same page by postback, duration of PreRender varies from 0.5 second to 3-4 seconds.
In addition to gridview, there are several dropdownlist, update panel, ImageButton in gridview. I use paging for Gridview.
Which strategy should i follow to increase performance of this page?
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Jan 13, 2010
Whenever I try to export a ListView with formatting or dynamic content in the PreRender event to an Excel file, I lose all of the changes from the PreRender event. Here's the ListView code:
<asp:ListView ID="ListView1" DataSourceID="profileData" runat="server" DataKeyNames="ROW_NUM">
<LayoutTemplate>
<table cellspacing="0">
<thead>
[Code]....
I've done some reading and found that RenderControl possibly ignores anything in PreRender for a control, but I'm thinking there has to be a way to get those PreRender changes in there before extracting the ListView to Excel.
The only workaround I've found so far is to copy and paste all of my preRender code into the Page_Load, and then everything looks fine in Excel. However, then I have to duplicate my code, as I still need it in the preRender event to display it on the screen properly. I don't want to maintain the code twice.
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Oct 29, 2010
I have changed the look and feel of the grid by modifying the cols, rows in the gridview. I need to save this in the gridview viewsate, so that it load the modified look and feel next time it loads from the viewsate.
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Jul 17, 2010
I am finding it quite awkward. I have registered the user controls and they are actually being parsed as I can view the controls I have placed on them. Problem is that I cannot access them in code behing. Even when I place them, their tags are not represented in the intellisence drop down. What could be causing this? I am placing them on a page residing in a master page setting. The controls are declared on the child page.
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Aug 17, 2010
I have created two composite controls in the same assembly and registered that assembly in a master page
using <%@
Register
tag.
When I try to use these controls using the registered tag prefix I am getting only one control along with the tagprefix .
How to get all the composite controls present in the registered assembly?
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Jan 15, 2010
I have some user controls registered in the web.config.
Now I need to load some of them dynamiclly with the page.loadcontrol() function. This function needs a virtual path to the .ascx file. Is it possible to get this virtual path (that is the same as the source path in the config) by the tagname?
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Jun 3, 2010
I hav a prob of checkboxes' checks not being registered...as explained below :
I have a gridview which is being populated using datasets.
[Code]....
I have added a column of checkboxes it using a TemplateField
[Code]....
And I am using a button to count the number of checked checkboxes.
[Code]....
I am viewing the value of session variable under at check.aspx
The Problem is that no matter how many checkboxes I check they are always counted as 0. The 'check' just doesnt get regsitered in the gridview.
After quite certain testing, a few things are clear
The checkboxes are being discovered by the counting loop fine.If I mark a cell as checked in the dataset before binding, then that check does get registered and thus is counted. Any thing I am missing ? Do i have to update something ?
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Mar 9, 2011
I have 2 user controls on registered on one aspx page. UserControl1 us having one text box with require field and one submit button.UserControl2 is also having one text box with requirefiled and save button.
Expected o/p is- When I am clicking on any button out of 2(submit or save). Then only related text boxof that user control should be validate. But the error is Both text boxes are validate.
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Aug 3, 2010
I've converted an old school website project to a web application project. I've always registered all of my user controls in the web configs for easier maintainability. After converting the project type. None of my user controls registered in my web config are recognized any longer. In the designer files, it looks like it's unable to resolve the actual control and it's defaulting to some <namespace>.<ControlName> that is totally wrong. I really don't want to have to go through and put Register tags in each page where a control is used. In my web config i'm registering my control as follows:
[Code]....
I'm using Visual Studio 2010. I've seen several article around the internet that allude to an issue back in VS2005. Scott Gu commented on several. I haven't seen anything specifically referring to issue in 2010. Has anyone else encountered this type of issue. I provided a really brief overview and i would be happy to go into more detail
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Jul 15, 2010
I read this
[URL]
and I was wondering if there's anyone that can explain to me what Prerender should do, for example for a button or a calendar component.
I can't imagine it; can you show me few lines?
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