I'm receiving the following error in DesignMode with the Accordion1 control. Not sure what is causing this. This is my ASP WebApp.Error Rendering Control - Accordion1 An unhandled exception has occurred. Collection was modified; enumeration operation may not execute.Any idea, what causes this error?Code VS 2005 Pro ASP Ajax XP SP3
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I am new to ASP.NET and AJAX
I want to use Accordion control in my page
but when i try to add that controlit is showing the error.
My code is
[code]....
I have a simple HttpHandler that generates a dynamic image based on query string parameters and a custom web control that renders an image tag pointing to the handler as its 'src' attribute. All works fine when run in the web server, but at design timethe control displays as the "missing image" icon (red x in a box). The handler is registered in the web.config with a ".ashx" extension. The RenderContents method in the control looks like this:
output.AddAttribute("src", ResolveUrl(string.Format("~/Sparklines.SparkHandler.ashx?stype=pm&w={0}&h={1}&sv={2}&ev={3}&cv={4}&sc={5}&ec={6}&mc={7}&gs={8}",
Width.IsEmpty ? 100 : Width.Value,
Height.IsEmpty ? 15 : Height.Value,
caleStart, ScaleEnd, CurrentValue,
ColorUtils.ColorString(StartColor, true),
[code]...
i am using the combobox ajax control i in design time i am having an error:
there was an error rendering the control. Request is not available in the context.
The method GetDesignTimeHtml of the ControlDesigner class should return html markup that will be shown on the page in design time. My problem is that control looks different in different versions of the visual studio. What is the rendering engine visual studio use to render control in design mode?
View 2 RepliesAfter I imported a VS 2008 web project to VS 2010, I can't view aspx pages that have master pages in design mode. The page design mode displays "error creating control - contentplacehoder1 object reference not set to an instance of an object." The project builds and runs fine though. I have only one master page that all other aspx pages reference and I don't have any nested master pages.
View 2 RepliesI have a custom control that renders different controls based on a property value. This all works correctly until i try and add a rating control to the control. When i render both controls in the CreateChildControls the control is rendered properly.
However when i try to add layout by overriding the RenderContents method and rendering controls there, an error is generated
Extender controls may not be registered after PreRender.The code shows both methods of creating the controls.
[Code]....
I render some markup dynamically in a Web User Control, can I get that out in design mode, and not only runtime?
public override void RenderControl(HtmlTextWriter writer)
{
if (this.DesignMode)
writer.Write("<p>In design mode</p>");
else
base.RenderControl(writer);
}
... nothing happens when I check the design view of the control. Not if I remove the if (this.DesignMode)-condition either.
I seem to be experiencing a problem with the modal popup on a page. I'm forcing IE 8 to render with the IE 5 engine using: <meta http-equiv="X-UA-Compatible" content="IE=5" /> as a quick fix while true IE 8 compatibility is being worked on.
Problem is the modal popup doesn't really work. It just displays at the bottom of the page, and when I scroll up/down, the page gets wider and wider..
I hate tables - don't want to use tables, unless I have tabular data to display. A menu is not tabular data (as far as I am concerned.) I was elated to see that in asp.net 4 - the menu control renders as a <ul> <li>, instead of as a table. However - try as I might, I can not get a horizontally orientated Menu to split into even columns, and text align center. FYI - I don't use fixed width - so I can't just set a width to 1000 - and separate it into even columns. Besides that, I want it to change width dynamically, based on the number of "columns (menuItems)" there are. Is it possible to spread out the <li> menu items evenly across the space I provide for them in their containing div or will I have to quite using menu controls, and start using JQuery Menu's?
View 2 Replies I have created a class UserDetailsModel.cs in my folder model. I have populated a selectedList in the model class.
I have create a view which is both strongly-typed and partial and the view data class is the abc.cs
I have the following code in the view
[Code]....
However, i`m getting the error of
[Code]....
[Code]....
How to add TABLE/TR/TD in HTML Editor (Design Mode)
View 5 RepliesI want to limit the number of characters that a user can type in. How can I do that?
View 3 RepliesWhat is the correct code to append text to the END of the content inside the HTMLEditor in design mode with a button click?In this case,there will be no cursor position set,hence the value will be 0, and the text is inserted at the beginning of the html within the HTMLEditor.This is what I am using to insert the text where the cursor is:
[Code]....
I have created a custom user control and place Ajax editor and override the class of ajax editor to disable few buttons in editor ,
i am getting the following error
unknown server tag on the design time, and iat runtime it is working properly,
suppose i've created my own user control, and it has a textbox and a property for the textbox so that if i use the user control from within the aspx file, i can give the property a value. for example:
[Code]....
is it possible to also set the property to be seen via the desing mode , just as it works for other (built in) controls? maybe a different method to implement the same scenario?
if you still didn't understand what i mean : after setting the value of DefaultNum1 via the code i've written here, i expect the textbox associated with this property to be updated as well to '1' via the design mode (and split mode). of course it won't work using the current method, since VS cannot guess what is going on with the property and understand that all of its purpose is to assign an initialization value for the textbox.
I'm working on a page that uses a master page. In the master page, I have a drop-down and when a value is selected I generate an evenIn the web page, I have this statement "Addhandler Master.FilterChanged, AddressOf FilterChangedFromMasterPage"Everything works fine, and can edit the page as much as I want, but only with the Source view - because if I look at the design view, the entire MainContent section is reduced to this error; "Error Creating Control- MainContent / Object Reference not set to an instance of an object"But if I debug it locally, or FTP it to the server, it works just fine!
View 1 Repliesi am creating a menu which has the below structure. what i would like to do is use a jquery ui accordion control.
can i place an accordion in an accordion?... i.e. menu 1 expands out in an accordion and then the sub menus in menu 1 need to expand out in another accordion.
menu 1
sub menu of the menu 1
menu item
menu item
menu item
sub menu of the menu 1
sub menu of the menu 1
menu 2
sub menu of the menu 2
menu item
menu item
menu item
sub menu of the menu 2
sub menu of the menu 2
I used accordion control and removed the click event on load using the $removedHandler in javascript but I've got an error "Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method."
Is there a way to validate if the event handler is already removed? Here's my sample code:
$removeHandler($find('ctl00_ContentPlaceHolder1_aMembersInformation_AccordionExtender').get_Pane(1).header,"click",$find('ctl00_ContentPlaceHolder1_aMembersInformation_AccordionExtender')._headerClickHandler);
I am having a problem with rendering a menu control inside a server control. I am getting an error in the RenderContents override method when I try to render the Menu Control. The error I am getting is an Object Reference error. The code is below...
[Code]....
I created a custom server control. The control works perfectly when added into a project. The issue I have though, is that in the designer - it shows the error --> "Error creating control - MyControl1 Object Reference not set to an instance of an object" The error is because I am using this code to load startup scripts
Dim pg As Page = HttpContext.Current.Handler
if i comment it out then the designer does not throw the object reference error so I know this is where the problem is. So here is my question: How can I get the designer to ignore the HttpContext.Current.Handler object for rendering puroposes?
Two separate questions, but sufficiently intertwined that I'm going to try the two together....
Firstly - User Controls and Behaviours
I have a User Control which contains a few visual controls. I am attaching some behaviours by using GetScriptDescriptors and am passing some JavaScript to the browser using GetScriptReferences. That is all rock solid and working well. However, when developing, I did discover that I couldn't attach the ehaviours to the User Control itself - not surprising as rendering a User Control does not create a DOM element which represents the actual control. So, I have attached my behaviours to a "random" TextBox within the User Control.
So - first question, is there a better way to do that? For example, should I always be rendering a SPAN as an element to surround the control? Not sure what that would do to the robustness of the rendering. What is the right way to attach a behaviour to a User Control.
Secondly - Accessing those same Behaviours later
Assume I have placed a User Control on the page. That User Control exposes a Property (actually a Javascript Function of course) which does "something" to the control - for the sake of example we'll say that the function is set_Border(colour). I then have a behaviour on the same page (actually an Extender on a different control) which needs to call the function. I have a reference to the User Control in my script, so I have tried TheControlReference.set_Border('red') and find that my control doesn't support the set_Border method.
I guess this is probably because the behaviours are not attached to the User Control itself, but to a GUI element within it. Hence, I suspect that the answer to the second question lies within the answer to the first.
I have an Error in the design view when I use the ajax toolkit. it says rendering Control Accordion - An unhandled exception has occurred. Collection was modified; enumeration operation may not execute. I have the relevant service pack, download ajax toolkit and I have used the appropriate declerations on the top of the page, I hope. I haven't yet even put anything on the page and the designer view shows the above error.
<%@ Page Language="vb" AutoEventWireup="false" MasterPageFile="~/Site.Master" CodeBehind="listaccessoriesbytype.aspx.vb" Inherits="FashionPrototypeProject.listaccessoriesbytype"
title="Untitled Page" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<cc1:Accordion ID="Accordion1" runat="server">
<Panes>
<cc1:AccordionPane ID="ac" runat="server">
<Header></Header>
<Content></Content>
</cc1:AccordionPane>
</Panes>
</cc1:Accordion>
</asp:Content>
I entered this manually in my webconfig: added this under the rest of asssemblies code
<assemblies>
<add assembly="AjaxControlToolkit, Version=3.0.30930.28736, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e"/>
</assemblies>
added under the rest of controls
<controls>
<add tagPrefix="ajaxToolkit" namespace="AjaxControlToolkit" assembly="AjaxControlToolkit, Version=3.0.30930.28736, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e"/>
</controls>
i used collapsablepanel extender
View 2 RepliesI have migrated .NET 1.1 code to .NET 3.5. Getting the following error in the page in design part: "Error Rendering Control- An unhandled exception has occured. A relative URI cannot be created because the 'urIstring' parameter represents an absolute URI. " It is happening for control:
<asp:hyperlink
id="hypPrint"
NavigateUrl="javascript:window.print();"
EnableViewState="False"
runat="server">Print Current Page</asp:hyperlink>
"NavigateUrl" propery is causing this error to occure.
I removed thisand tried, this error goes. But I need NavigateURL for my functionality to work.
