JQuery To Add Item To PlaceHolder Control?

Feb 17, 2010

It looks to me that the ASP.Net PlaceHolder control doesn't emit any HTML, and therefore can't be used by clientside javascript or JQuery to add items to the PlaceHolder. Does anyone know of a way around this limitation, or of an ASP.Net control that can be used to dynamically add items by client side code?

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Mar 22, 2011

I am using list view to display the the data but i am getting an error like An item placeholder must be specified on ListView 'ListView1'. Specify an item placeholder by setting a control's ID property to "itemPlaceholder". The item placeholder control must also specify runat="server.Even i have specified the itemplaceholder id but no use still same error.

[Code]....

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JQuery :: Hide / Show PlaceHolder With Checbox?

Nov 19, 2010

Placeholder visibility is set to false (in the code I will paste bellow it's set to visible). When users clicks checkbox the place holder will appear. If uncheck the checked checkbox the place holder would become invisible.

I wanted to help myself with the similar case found here: [URL]

and one similar on this forum: http://forums.asp.net/p/1509271/3590401.aspx

I think that this would be quite easy but guess my experimentation with code brings no posititve results and also the fact that I probably have enough of coding for this day. :)

The code (I'm also using fancy checkbox plugin - Safari style):

[Code]....

The IE returns no error.

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JavaScript - Finding An Element In Jquery With Some Kind Of A Placeholder

Jan 24, 2011

I have a nested table structure, a part of which is rendered by a ajax call that returns HTML from the server. The markup looks like this:

<tr>
<td><table cellpadding="0" cellspacing="0" border="0">
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<%-- Content will be displayed from ajax call 2 --%>
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In jquery, I need to insert this html for which i need an element to traverse to so that I can call the html() of that element. Unfortunately, if I use a div, for example:

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<%-- Content will be displayed from ajax call 2 --%>
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the classes are setup such that the div or a span causes other issues.

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Maintain ViewState Of PlaceHolder / When Page Get Refresh All Controls From Placeholder Gets Removed From It?

Jan 19, 2010

how to maintain state of placeholder. i have a placeholder in which i add many image controls dynamically but when my page get refresh all controls from placeholder gets removed from it. the enableViewstate of placeholder is set to true.

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How To Move .NET PlaceHolder Control From Page Controls Collection To Custom Control's Output

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I am writing an ASP.NET custom control.In my custom control code, I find a PlaceHolder control in the page like so:this.myPlaceholder = Page.FindControl("placeholder1") as PlaceHolder Then, I render the placeholder as the output of the custom control:

protected override void Render(HtmlTextWriter output)
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However, this causes the placeholder to be rendered in two places - in the custom control output (good) and in the original location in the page (bad).

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AJAX :: Web User Control Loaded Into PlaceHolder Control Causing Full Postback On Parent Page?

Jun 1, 2010

In my default.aspx page I have a PlaceHolder control within an UpdatePanel. In this placeholder control I will dynamically load a web user control, which is just a form with a submit button. On this user control, I have the form within an update panel and I have the "Submit" button's Click Event added to the triggers.

When I submit the form, the UpdatePanel on the web user control nor the update panel on the default.aspx page are capturing the post back, thus causing a full post back which refreshes my page.

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C# - Add Custom Control To A Placeholder All Controls

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I've created a usercontrol in asp.net webforms (c#) called 'Article' which contains a general layout for an article and has a public property called datasource. the datasource will be populated by a subsonic (DAL) activerecord. In the controls pre-render event it will read the record and populates the labels. I think this is a flexible solution with easy maintenance. My problem however is that when I try to add the control to a placeholder all my controls like labels, literals and the like receive a null reference exception. I'm trying to spawn the controls as followed:

foreach (DAL.Article item in coll)
{
p7.Controls.General.Article.Article article = new p7.Controls.General.Article.Article();
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Is there something I've completely missed? It's driving me crazy heheh! Another question is do you guys know if this method will have a big impact on performance. I'm only adding 10 of those article controls per page.

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Web Forms :: How To Find Control Within A PlaceHolder

Jun 8, 2010

[Code]....

In my code, I wanted to do a search on the form controls, such as check box and radio button. These controls are created during run time.

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Adding Html To A Placeholder Control On The Fly?

Jan 15, 2010

I am a generic markup which I load at runtime froma file as follows:

<div id="pagewidth" >
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C# - Find Control Within ContentPlaceholder And Placeholder?

Sep 23, 2010

I am adding controls dynamically to PlaceHolder which within ContentPlaceHolder

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It looks like I am missing something because t2 is always null

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VS 2010 - How To See A Control In Another Content Placeholder

Apr 13, 2012

I'm using a masterpage and having some trouble with my ContentPlaceholders. I have a combobox(DropDownList1) in the sidemenu content placeholder and in my main placeholder I have a gridview. The gridview is supposed to do a select in the db using the selected value of DropDownList1. When I set up the connection SQL within the datagrid, using the wizard; I select to get a parameter from a control and then I select DropDownList1.

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How do I get asp.net to see the control sitting in the other placeholder?

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Aug 4, 2010

[Code]....

I want to copy a placeholder to another placeholder, i know, i can't write somethin like this,

plh_footer = plh_header;

how can i do that?

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Dec 10, 2010

I am creating dynamic controls... i.e. ddl

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ddl.ID = id;
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ddl.DataBind();
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Loading the controls to the placeholder.

Selecting a value and clicking the button, doing postback, I want to capture the value selected in the ddl. I was using "FindControl method" but it is not working, I guess because the controls are created dynamically and will not show due to stateless HTTP.

How else can I capture the values? Is there away?

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Can a placeholder control be created dynamically such that you can add controls to it later on?

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I am having problems finding my UserControls inside the Controls collection of a Placeholder control.

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My objective here is to get to the input controls within my UserControl and call the save method of this.

PlaceHolder intakeBenefitHolder = null;
protected void lvIntakeBenefits_ItemDataBound(object sender, ListViewItemEventArgs e)
{
if (e.Item.ItemType == ListViewItemType.DataItem)
{
using (ListViewDataItem item = (ListViewDataItem)e.Item)

[Code]....

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Wrap A Line Break Into A Control And Add A <br /> To An Placeholder?

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If I have an asp.net web page with placeholders,what is the simplest way to wrap a line break into a control that I can pass to the Add function of the placeholder?

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Web Forms :: How To Access A Control Inside A UpdatePanel And PlaceHolder

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I need to access a dynamically created DropDownList from code-behind. This DDL is in a Placeholder, and the PlaceHolder is in a UpdatePanel.

I did the following to try and access the DDL:

[Code]....


But it returns null :( Why does that happen? How can a access the DDL?

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C# - Accessing A Control Dynamically Added To A Placeholder During An Event

Mar 30, 2011

I'm creating an ASP.NET control dynamically based on a value selected in a dropdown; for instance the field can be a textbox or a checkbox (for now), and then it gets added to a placeholder control. However, I'm unsure how to retrieve the value - using the placeholder's FindControl method returns null although I'm specifying the ID when I create the control.

Here's my code:

[code]....

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Web Forms :: Setting Visible Attribute On PlaceHolder Control Triggers?

Feb 22, 2011

I have a web form with an Asp.net PlaceHolder control. By default the control is set to visible false and will be displayed through the code behind based on several criteria. In general this PlaceHolder control wraps several other Asp.net controls. Now a new requirement ask that the controls within the PlaceHolder control be visible at all times an no longer hidden. So in the Aspx code I changed the laceHolder attribute and set it to visible. Now all kinds of Java Script validation errors are occuring and it is a horrible spahgetti code nightmare. Is their a way to set the visible attribute on the control and not have it trigger the validation?

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Forms Data Controls :: How To Add And Access To Placeholder In A Repeater Control

Aug 16, 2010

i want to add and access to placeholder in a repeater control. for example,

[Code]....

how can i acces to placeholder, on codebehind. i couldn't acces with it's id.

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Web Forms :: Line Breaks In Dynamically Built Placeholder Control?

Feb 17, 2010

I have a Placeholder control on Employee Main Menu. Several SQL Data sources are run at page load in order to notify employees that something is due. Each "something is due" message is loaded into a unique label. Therefore the Placeholder could have several labels in them. For clarity's sake I'd like them separated by line breaks. However I understand from reading a previous forum item that "< /br>" are ignored. How can I embed a line break when PlaceHolder_Msg.Controls.Count > 1

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Web Forms :: Dynamic Control Added To PlaceHolder Disappears On Button Click?

Nov 16, 2010

I have a dropdown on page, a place holder and a save button on my form.Now, I am creating a textbox on selectedIndexChanged event of dropdown list and adding it to placeholder. And on button click I want to access the control, but on click event, I find the textbox as null. Here is my code

protected void Dropdownlist1_SelectedIndexChanged(object sender, EventArgs e)
{
if (Dropdownlist1.SelectedValue != string.Empty)

And button Save click event

protected void btnSave_Click(object sender, EventArgs e)
{
TextBox txt = new TextBox();
txt = (TextBox)this.ElementPlaceHolder.FindControl("txtArea");

[Code]....

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