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?
View 1 RepliesI 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.
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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):
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The IE returns no error.
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">
<%-- Content will be displayed from ajax call 1 --%>
<%-- Content will be displayed from ajax call 2 --%>
</table>
</td>
</tr>
</table>
.. more html
The ajax call returns the following html
<tr>
<td class="wpss_checkboxtd"><img width="16" height="16" src="../../images/someimg.png"></td>
</tr>
<tr>
<td class="wpss_checkboxtd"><img width="16" height="16" src="../../images/someimg.png"></td>
</tr>
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:
<table cellpadding="0" cellspacing="0" border="0">
<div id="divAjax1">
<%-- Content will be displayed from ajax call 1 --%>
</div>
<div id="divAjax2">
<%-- Content will be displayed from ajax call 2 --%>
</div>
</table>
the classes are setup such that the div or a span causes other issues.
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.
View 3 RepliesI need to have 3 different sections of a listview act as a repeater, but independen of each other. Each will have identical column headings, but different datasources. They will all share the same Heading, but each will have a different footer. In other words, I need to have 3 different "itemPlaceholders" in one listview.that be done.Presently, I have a panel with three listviews nested together. It works fine except that the formatting of them doesn't stay consistent.
View 2 RepliesI 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)
if (this.myPlaceholder != null)
this.myPlaceholder.RenderControl(output);
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).
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.
how to capture this post so its rendered in Ajax and not a full post back?
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();
article.datasource = item;
phContent.Controls.Add(article);
}
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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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.
I am a generic markup which I load at runtime froma file as follows:
<div id="pagewidth" >
<div id="header" > Head </div>
<div id="wrapper" class="clearfix" >
<div id="twocols" class="clearfix">
<div id="column2" > Main Content Column </div>
<div id="column3" > right Column </div>
</div>
<div id="column1" > Left Column </div>
Footer
I want to add this to a place holder control in asp.net web page. How do I do it?
I am adding controls dynamically to PlaceHolder which within ContentPlaceHolder
var t = (ContentPlaceHolder)Master.FindControl("ContentPlaceHolder1");
var t1 = (PlaceHolder)mpContentPlaceHolder.FindControl("PlaceHolderName");
var t2 = (DropDownList)t1.FindControl("ControlID");
It looks like I am missing something because t2 is always null
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.
Now, When I try to run the page, it returns an error "Exception Details: System.InvalidOperationException: A control with ID 'DropDownList1' could not be found", however if I move DropDownList1 to the main placeholder, everything works perfectly.
How do I get asp.net to see the control sitting in the other placeholder?
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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?
I am creating dynamic controls... i.e. ddl
DropDownList ddl = new DropDownList();
ddl.DataSource = data;
ddl.ID = id;
ddl.DataValueField = "Key";
ddl.DataTextField = "Value";
ddl.DataBind();
PlaceHolder1.Controls.Add(ddl);
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?
Need accessing the rendered content of a PLACEHOLDER control. I dynamically add a web forms page to a placeholder using "TABLE" this works great (cell row table placeholder ) now I wish to take that placeholder and use the rendered page to generate a PDF document.
If it possible to access the rendered code how would this be done?
Can a placeholder control be created dynamically such that you can add controls to it later on?
PlaceHolder ph_grid = new PlaceHolder();
I am having problems finding my UserControls inside the Controls collection of a Placeholder control.
I have a ListView control with a PlaceHolder control in its ItemTemplate. OnItemdataBound for the ListView control I am adding a custom UserControl to the Controls collection of the Placeholder control. It all renders fine. My problem is when I try to find my user controls in the Placeholder. I just can't get it back. My code is below.
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)
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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?
View 2 RepliesI 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:
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But it returns null :( Why does that happen? How can a access the DDL?
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:
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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?
View 4 Repliesi want to add and access to placeholder in a repeater control. for example,
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how can i acces to placeholder, on codebehind. i couldn't acces with it's id.
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
View 2 RepliesI 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");
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