C# - ID "itemPlaceholder" Is Not Rendered When Using Custom LayoutTemplate?
Feb 7, 2011
I've created a simple ASPX-page, added a ListView control to the page and created two implementations of the ITemplate; one for the LayoutTemplate and one for the ItemTemplate. The trick here is that I specify a collection of columns I want to display in the ListView and supplying the collection as a parameter to my LayoutTemplate class. Here's the whole code (the call to "Columns.Skip(1)" in "LoadDataSource" is merely to verify that I can render the ListView with a arbitrary number of columns):
public partial class ListViewITemplate : System.Web.UI.Page
{
private static IList<string> Columns
{
get
{
[Code]....
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Aug 20, 2010
i am new to technology so go easy on this post according to what i read from web there are 3 type of custom server controls 1 superclass2 composite 3 renderedi found video tutorial for superclass custom server control but couldnt find video tutials for other 2.lease forward me link for composite and rendered custom server controls video tutorial
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Aug 2, 2010
I'm working on a custom serverside control and faced to a weird issue.
The control's client-side markup should look like:
[Code]....
But my control renders following markup:
[Code]....
As you can see, attributes for the first <li> element is not rendered.
Here's the Render method:
[Code]....
items collection is filled correctly. Debugging the code showed that AddAttribute is called for first Li element, but the output is rendered incorrectly.
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Apr 14, 2010
I have a custom control that renders a button. I'm trying to attach a server click event but it isn't firing. My code is:
protected override void CreateChildControls()
{
btnRangeGo = new Button();
btnRangeGo.CssClass = "divSearchGo";
btnRangeGo.Text = Resources.CORE_Resource.S0C29; // Go
btnRangeGo.Click += new EventHandler(btnRangeGo_Click);
// Tried with no luck:
// this.Controls.Add(btnRangeGo); // Needed so OnClick gets registered
// Page.Controls.Add(btnRangeGo); // Needed so OnClick gets registered
}
private void btnRangeGo_Click(object sender, EventArgs e)
{
int i = 1;
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OnRender:
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Sep 29, 2010
Why do we use this in ListView?
<tr
id="itemPlaceholder"
runat="server"
/>
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Jan 6, 2011
In my own server control, I would like to implement something similar to the ListView:
<asp:ListView runat="server">
<LayoutTemplate>
<asp:PlaceHolder runat="server" id="itemPlaceholder" />
</LayoutTemplate>
</asp:ListView>
I have created an ITemplate property, I can set the layout in the aspx page, and I am doing ITemplate.InstantiateIn(myControl).
But I can't figure out how to insert controls at the placeholder. I'm guessing it would be something like MyTemplate.FindControl("itemPlaceholder").Controls.Add(myControl). I tried casting to the type of my ITemplate, but I get the error:
Unable to cast object of type 'System.Web.UI.CompiledTemplateBuilder' to type 'MyNamespace.MyLayoutTemplate'
Edit: I just found this: http://www.nikhilk.net/SingleInstanceTemplates.aspx Control developers can define templates to be single instance using metadata which causes the ID'd controls within the template contents to be promoted to the page level... The parser and code-generator together work behind the scenes to add member fields, and initialize them at the right time.. It seems to be only for user controls? I tried Page.FindControl() after doing this but it didn't find anything.
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Mar 31, 2011
I have an <asp:ListView> but for some reason the LayoutTemplate section does not show when the list is empty, although the <EmptyDataTemplate> section shows. The LayoutTemplate contains the headers for the table, and I want to show an empty table when there are no items in the datasource, not just the content of EmptyDataTemplate.If there is no choice I will copy the LayoutTemplate into EmptyDataTemplate.
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Sep 4, 2010
How to set the width property the LayoutTemplate in a listview through codebehind
[Code]....
[Code]....
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Aug 20, 2010
according to what i read from web there 3 types of custom server controls
1. composite
2.superclass
3.rendered
i found video tutorial to create and use superclass custom control in your project (extending dropdown control functionality)
i am trying to search video tutorial for other 2 types .
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Sep 24, 2010
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Sep 2, 2010
I have a report that is created using Telerik Reporing 2010.You have the ability to export to PDF.One of the cells contains a standard hyperlink that when viewed from the report view works fine
The cell contains this simple link<a href="http://site.com">link</a>What I would like to be able to do is maintain the hyperlink functionality when the report is rendered to PDF.Im assuming PDF requires something more than just HTML to render a link ?
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Mar 29, 2011
If I use html.beginform on my partial view, the attributes get rendered. If I remove html.beginform and instead use jQuery to load my partial view into a dialog, the validation attributes aren't firing even after I've called $.validator.unobtrusive.parse(selector) because the attributes are not getting added to the html. Im using Html.EditorFor, and the attributes don't show up unless I put an Html.BeginForm around it.How can I force the attributes (they are [Required] on my model)?
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Oct 5, 2010
i am developing in vb.net. i have a gridview with a template field, in which i have a asp:image tag. But the browser dont show any image. i does not render the image. if i check the sourccode in the browser there is no image tag. But the visual web developer show the image. i tried all avriation of paths.
<asp:TemplateField>
<ItemTemplate>
<asp:Image ID="Image1" runat="server" ImageUrl="~/ProfilePictures/icon.png" />
</ItemTemplate>
</asp:TemplateField>
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Mar 22, 2010
Is there a way (without overriding Render) to get the Rendered HTML output of a UserControl? What if the UserControl as a control tree with other controls in it?
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Jan 10, 2011
I have a main page with one update panel
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Jan 31, 2010
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Feb 10, 2011
I have an <asp:Panel> inside an li, so the problem is the html will not validate. changing the rendered div to a span? I'm doing this in a ASP.NET 4.0 website using c# code.
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Feb 7, 2011
I have a few controls (a panel containing some textboxes and dropdownlists) that are hidden until the user clicks a button to toggle their visibility. The toggling is done via JQuery and works great. One thing that bothers me is that although this panel is hidden when the page finishes loading, you can see it while the load/render process is taking place. So you can see it and then all of a sudden it fades out. Is there a way to hide it earlier in the process so we don't see it at all? I did try putting visible = "false" on the panel definition, and then you can't see the panel on loading which is good, but then my JQuery code won't toggle it to visible. Perhaps my JQuery code needs tweaking.
[Code]....
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Apr 13, 2010
We are rendering usercontrols dynamically like this:
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This lets us the same user controls when rendering pages normally as we do when rendering responses to ajax calls. However, when adding controls which themselves contain a scriptmanagerProxy we run into the problem that the newed up Page object doesn't contain either a ScriptManager or the HtmlForm in which the ScriptManager needs to run.
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May 7, 2010
I am using ASP.NET. I have an html table. One of the table cells (td) has two buttons. Just recently, when it is being rendered it is wrapping the buttons. Can anyone tell me why this is happening?
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Jul 29, 2010
Recently we copied an ASP.NET WebForms solution. In this solution we are using some ASP:ListBoxes where the Rows property is set to more than 1.
This renders following HTML..
<select size="8" name="ctl00$MainContainer$lbType" multiple="multiple"
onchange="javascript:setTimeout('__doPostBack('ctl00$MainContainer$lbType','')', 0)" id="ctl00_MainContainer_lbType">
<option value="--">-- - --</option>
<option value="BR00">BR00</option>
<option value="BR01">BR01</option>
<option value="...">...</option>
</select>
Looks fine to me. But the strange thing is that in the copied solution the browser doesn't render what it should be rendering. The size property seems to be ignored. It just gets rendered as if the size was set to one.
This applies to all listboxes in the solution. I compared the masterpages and web.configs and there are no differences. This issue also applies to all browsers. I used IE8 Developer tools to compare the documentmodes and they are the same for both solutions.
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Nov 12, 2010
I want to call the corresponding html inside a Panel in code behind. How can I do that?
I have this
<asp:Panel ID="MyPanel" runat="server">
// other asp.net controls and html stuffs here.
</asp:Panel>
I want to get the HTML equivalent of MyPanel and all of its contents in my code behind say in PageLoad or some methods.
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Jan 5, 2011
I have to add a dropdown control in the web part. I am rendering the part using HTML Strings as follows...
StringBuilder sb = new StringBuilder();
sb.Append(div id="content); There are quotes in the string
sb.Append(div class=""hb"">");
*sb.Append(div class=""someclass"">");*
sb.Append(h2 id=""contentpage_title"">Title");
**sb.Append(div class=""ctn_conferences"">");**
writer.Write(sb.ToString());*
I have to add a loaded dropdown control...so I declared..
protected DropDownList ddMyDropDown = new DropDownList();
Then added the control in the middle of the render where I wanted as follows...
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Everything is fine....except... the post back does not work. My event handlers are not getting executed.
When I add the control ...like Controls.Add(Control) then it adds at the bottom of the part. That is not what I want.
So how do I get the post back to work?
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Feb 28, 2011
Although I'm a huge fan of Databound controls since ASP.Net 2.0 and have been using them a lot since learning them, I seem to have stumbled upon an unnoticed(or rather not cared about) issue that these controls seem to have.
I'm using ASP.Net 3.5 and the issue that I noticed is that when using Databound controls(such as Labels, HyperLinks) inside a Data-Control(such as Datalist, Gridview etc.), even if the value returned for one column is NULL, it is still rendered albeit as an empty tag.
For eg: I have a Datalist in which I have a Label whose value may or may not be NULL. Now there's no problem when the value is not NULL, the problem is when the value is NULL. Ideally, no HTML should be rendered for a controls that don't have any value, but in this case, the HTML(<span></span> in case of the Label) of the corresponding NULL valued control is still being rendered.
Now, as I said earlier that most people won't care about this as it isn't much of an issue, but if you consider the fact that this control may be enclosed in a hierarchy of parent controls, and then repeated many a times, this could significantly increase the HTML content(since the ID of your HTML content is based on the parent controls) without any Text added to maintain the Text/HTML ratio, thereby becoming a cause for the Search Engines to shy away from indexing your pages fully.
I couldn't find anything related to this matter anywhere else so I thought to bring it up here. Is this really an issue with databound controls or am I missing something here?
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Aug 13, 2010
Experimenting with MVC 3 Razor -
After attempted to add jquery script tag to _Layout.cshtml as below, the result is empty body tag rendered in content page. I tried this immediately after creating new project to insure I hadn't mucked anything up. This is run on local Win7 dev machine. Any explanation for this or is there a new way to specify script references in the "master" layout page(s)? Omitting @Url.Content had no effect.
<head>
<title>@View.Title</title>
<link href="@Url.Content("~/Content/Site.css")" rel="stylesheet" type="text/css" />
<script src="@Url.Content("~/Scripts/jquery-1.4.2.js")" type="text/javascript" />
</head>
According to IE8 Developer Tools :
- css file is loaded
- js file ref from master/ layout is loaded
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- no "default" header and menu visible
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