MVC :: How To Put A Placeholder Before The "MainContent" Placeholder In The Generated View
Jun 3, 2010
I am using ASP.NET MVC 2 in Visual Studio 2010. I have a ASP.NET MVC application with a master page that contains 3 content placeholders. When I create a new view from a controller by right-clicking the action method and selection "Add View", I end up with a ASPX page that does contain the 3 content placeholders but in the wrong order. This is by design because in the T4 template used to create views "TitleContent" will be used first followed by the "MainContent" and after that all the other content placeholders are put.
I have a subtitle content placeholder in my master page that I want to put before the "MainContent" placeholder. Is there a way to achieve this with modifying the Create.tt T4 template?
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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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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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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;
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Oct 31, 2010
Is there any way to use placeholder similar to WebForms in NVelocity View Engine (.vm files)? Today I've got a component containing everything for the <head>, but I wish to specify additional tags from each view page like it can easily be done in ASP.NET WebForms / MVC:
<asp:Content ID="Content2" ContentPlaceHolderID="head" runat="server"></asp:Content>
If this is not possible directly trough NVelocity View Engine, do I have any other alternatives other than using a blank MasterPage and adding all markup in each view page?
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Jan 1, 2011
On my web-page I have PlaceHolder, not controls are loaded into it.
<asp:PlaceHolder ID="PlaceHolderStatMain" runat="server">
</asp:PlaceHolder>
I am looking the ViewState generated for the page, it is the following:
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJLTg1NDkyNTUzD2QWAgIDD2QWAgIND2QWAmYPZBYCAgEPZBYCZg9kFgJmD2QWBmYPFQEYL3N0YXRfc3RhZGl1bS9sZWFndWVfV0VGZAIBDxUBGC9zdGF0X3N0YWRpdW0vbGVhZ3VlX0VFRmQCAg8VARgvc3RhdF9zdGFkaXVtL2xlYWd1ZV9GQ1VkZEuSBUr5LFL6WfCehNBJgjrq0GzwWCWN2qlU70V7LAAb" />
When I set EnableViewState to false:
<asp:PlaceHolder ID="PlaceHolderStatMain" runat="server" EnableViewState="false">
</asp:PlaceHolder>
The viewstate content was decreased significantly:
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJLTg1NDkyNTUzZGTTn8Y28VwmpE/K7yPPkLFvhrqMdU8THijFW/BMFzk0tQ==" />
Question: how to remove 'useless' viewstate content without disabling viewstate for placeholder himself (I would like other control loaded into placeholder to has viewstate)?
Is it possible at all?
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Mar 11, 2010
I have a repeater and within that repeater, I have an item template. Now this template is formatted with a couple of tables, but for this question I have removed them to make things easier to read:
[code]....
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Jan 11, 2010
My application generates report which lists blocks of information within placeholders. When the text is very long it is wrapping around with no indentation.
It appears like this:
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Is this something that can be fixed?
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Jan 7, 2011
I have a #placeholder in a page .I want to redirect to this page form a link that should take me to #placeholder section.in firefox this works fine,but in ie i am not getting #placeholder
my redirect logic
- string path =
HttpContext.Current.Request.RawUrl +
#placeholder;
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Nov 10, 2010
A little pseudo code to provide some background:I have an ASPX with a placeholder and a buttonWhen the button is clicked it adds a web user control (uc1) to my placeholderhe uc has a buttonWhen clicked it adds a different user controls (uc2) to the placeholderStepping through the code, if I look at the placeholder.controls.count before and after the button-click in #4 the count increases by one, as you would expect.The problem is that the uc2 added in #4 doesn't appear on the screen. So, I wrapped my placeholder in an UpdatePanel. I've never used one before. So, I could refresh the placeholder after the uc2 was added.relevant ASPX code
<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server></ajaxToolkit:ToolkitScriptManager>
<ajaxToolkit:TabContainer ID="tcNavigation" runat="server" ActiveTabIndex="0">
[code]...
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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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Oct 20, 2010
I have a HTML table that is built with a repeater. Sometimes the table has 5 rows, sometimes it has 8 rows.
It was easy to add the header rows.
<asp:PlaceHolder runat="server" ID="additionalHeaderColumns" />
In code behind I added controls (htmlheadercells) to the contentholder:
Dim tableHeaderCell As New TableHeaderCell()
tableHeaderCell.Text = "Test"
additionalHeaderColumns.Controls.Add(tableHeaderCell)
When I try to do the same in the databound event for each row I get an errormessage that tells that its not possible to put asp:PlaceHolder inside the row. it expects tablecells.
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Apr 1, 2010
I have a web form and i'm creating tables including radiobuttons dynamically according to a number entered from a textbox,this tables created in placeholders.I'm using update panels so when i click the radiobuttons the radiobutton dissappear and a textbox is created at the same place,if one cell is created there's no problem but at multi creation there's a problem,when i click one radiobutton,all of them disappear and textboxes created,btw there's a checkedchanged event created dynamically also.I try many ways but i can't find the selected radiobutton,what do i have to do?
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Jul 31, 2010
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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Nov 28, 2010
I'm working with a website written in aspx.net over vb.
I have a placeHolder, and I create a table of names inside this PlaceHolder, each name has an HtmlInputCheckBox next to it.
Im doing this in the aspx.vb file, when the page is uploading.
Then, when the user wants to send mail, he presses a button and than I need to access the checkboxes, and I'm having problems with this, the Sub doesn't know the checkBox object.
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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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Nov 11, 2010
I've problem with validating all text boxes in PlaceHolder. I made PlaceHolder and I've no idea how to check that all textboxes have integer numbers as a text.
public void Made_Matrix (PlaceHolder Matrix, int Size){
for(int row=0; row < size; row++){
for(int col=0; col < size; col++){
TextBox TB = New TextBox();
Matrix.Controls.Add(TB);
TB.ID = TB + Convert.ToString(row) + Convert.ToString(col);
TB.AutoPostBack = "true";
}
Matrix.Controls.Add(new LiteralControl ("<br/>"));
}
}
public void TB_Validate (PlaceHolder Matrix, int Size){
for (int row = 0; row < size; row++){
for (int col = 0; col < size; col++){
string Ident = TB + Convert.ToString(row) + Convert.ToString(col);
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Jan 15, 2010
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?
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Nov 8, 2010
TThis time I'm facing some unusual behavior with a web page that I'm developing. I have a table with several controls and gridviews and stuff. At some point of the table, i have to show some rows (they were hidden) when the users clicks a button. I was doing this with a PlaceHolder, but now i have to do it without the postback being displayed. I thought: "That should be easy, all i have to do is to put the PlaceHolder inside an UpdatePanel, and that's it" but no, no no nooo!! NOTHING IS THAT EASY!!! It actually works but it puts the hidden rows at the top of the page, not where they suppose to go!!My code is the following:
<asp:UpdatePanel runat="server" ID="uplAutoridadesAmbientales">
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Mar 11, 2010
I have a repeater and within that repeater, I have an item template. Now this template is formatted with a couple of tables, but for this question I have removed them to make things easier to read:
<asp:Repeater ID="Repeater1" OnItemDataBound="R1_ItemDataBound" runat="server">
<ItemTemplate>
<asp:PlaceHolder ID="phAnswers" runat="server"></asp:PlaceHolder>
</ItemTemplate>
[Code]....
why phAnswers is not updated with the new tempPH placeholder?
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Jun 14, 2010
I have an .aspx form that has a place holder that allows a user to add controls on button click. Upon button click of "Remove last added control" the user will see the last control be removed. I have searched this and can capture the control that they are wanting to delete but am having trouble actually removing the darn thing!!
Here is my code that I have that iterates through the controls and finds the specific ID that i want to delete but does not seem to delete it due to my syntax I believe (Coded in C# in .Net envirnomnet).
foreach (Control c in myPlaceHolder.Controls)
{
if (c.ID == "myTextBox" + Convert.ToString(Session["Control_Count"]))
{
this.Controls.Remove((c));
}
}
The session["Control_Count"] is the highest or greatest value that is added to the page. (example of 2 control ID's: myTextBox1, myTextBox2.) I want to be able to Delete TextBox2 and leave TextBox1 and thought thi swas a way of doing so.
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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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Sep 23, 2010
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
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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.
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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Apr 30, 2010
Im trying to do this
[Code]....
But it doesnt like
[Code]....
Won't work for me since this is a mobile application.
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