Web Forms :: ContentPlaceHolder On Postback - Doesn't Add Content
Dec 29, 2010
[Code]....
Then, in the codebehind I have this code:
[Code]....
This works fine when I display the page. However, when I click the language link which causes a postback the content block does not get added to the placeholder, so I get a null reference because those two panels don't exist. I've been pulling my hair out over this for a few hours now and I can't figure it out. In case it helps, here is my InitializeCutlture method:
[Code]....
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Mar 24, 2011
I was wondering if there was any way to ignore content if a contentplaceholder doesn't exist?
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Jan 14, 2010
i copied the html code from an aspx page from the tag <form> all the way down and paste it in the sorce of aspx page that bind with the MasterPage. now on the design view i need to see all the content of the page in the ContentPlaceHolder. it worked for 2 pages but in the thired page as i paste the html code the ContentPlaceHolder didnt reshaped itself to page size in the design its like spred all over the page. i'm working with visual studio 2005 asp.net c#
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Apr 13, 2010
I am searching the internet for possible solution for my problem, I have a page that sets the master page at runtime, my problem is how to create a content (asp:Content) control for each of contentplaceholder (that exists at design-time) in each masterpage?? I am looking at AddContentTemplate, but seems not working...
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Nov 18, 2010
Probably a simple fix to this I am not sure. Basically, I have a MasterPage that contains a Dropdownlist. This DDL controls what is displayed in ContentPlaceHolder. However, when postbacks are caused within the Contact Pages the DDL is resetting itself. How can I keep the selected value for the DDL between postbacks?
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Jan 8, 2011
I currently have three masterpages and content pages in the following hierarchy: One root-level masterpage that displays the final result. Call this "A" Two sibling pages that don't reference each other but contain all the same contentplaceholder elements, just in a different order with different <div>'s surrounding them. Both reference the root-level masterpage. Call these "B1" and "B2". Several content pages that reference one or the other sibling master pages above (not both). Call these "C1" through "C-whatever".
Cn => B1 => A
Cm => B2 => A
This hierarchy works fine. Desired Setup What I want to do is add in a new level to this hierarchy (a new master page) between the content pages and the sibling masterpages. Basically so it's like this: One root-level masterpage that displays the final result. Two sibling pages plus a third sibling. Call it B3 A new middle masterpage that dynamically 'chooses' one of the sibling masterpages. The desired behaviour is to pass through the content given by C directly to Bn without modifying it. The only thing D actively does is choose which Bn. Call this new masterpage D. Several content pages that reference the new middle master page instead of the old siblings. The challenge to this is, I'm working within the confines of a rather complex product and I cannot change the original two sibling masterpages (B1 and B2) or content pages (C) in any meaningful way.
I want:
Cn => D => B1 => A
Cm => D => B2 => A
Ck => D => B3 => A
Essentially, D should "pass through" all it's content to whichever B-level masterpage it chooses. I can't put this logic in the C-level pages. Additional Details All B-level pages have the same content/contentplaceholder tags, just ordered and styled differently. D can be as convoluted as it has to be, so long as it doesn't require modifying C or B. I'm using ASP.Net 2.0
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Sep 17, 2010
What I'm trying to do is use one master page with two different layouts. Currently we have a "master" master page that has all the common elements and two master pages that use it for the two different layouts. This gives us 3 master pages and there's developer confustion and it is a bit of a hassle to keep them consistent. What I'd like to do instead is say "if there's anything in the MainContent ContentPlaceHolder, show the single column layout, otherwise show the two column layout".
From what I've read you're supposed to be able to do this by using something like the following:
[Code]....
But this.MainContent.Controls.Count retuns zero when the ContentPlaceHolder uses Html.RenderPartial. For example, this works fine:
[Code]....
This causes this.MainContent.Controls.Count to return 1. If I remove MainContent from the view, it returns 0, as expected. However, if I do this:
[Code]....
Then this.MainContent.Controls.Count returns zero.
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Mar 22, 2010
In my project when i click any button or linkbutton, it doesnt fire any event or doesnt postback.
It was working fine but now it hv problem like this.
I think i have changed some settings by mistake.
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Jan 4, 2010
I am building a website in which all of the site layout is in Master page and the content of the site is in the inherited pages. I have various links for navigation in which i simple use Response.Redirect to transfer to different pages. Now the problem is that I want to put the content place holder inside Ajax Update panel so that the postbacks are Asynchronous and I want to show the postback by an animated image inside Update Panel progress control. The problem is that I am unable to achieve this result and the entire page is posted back and rendered again. I have placed the content place holder inside the Ajax control toolkit's Update panel but it does not work. Is there any way that I can change the content of the content place holder to a new page with asynchronous postback.
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Aug 13, 2010
I have a master page which has several ContentPlaceHolders. Not all of them are used by the current content page all the time. During page rendering the master page needs to set a property when a ContentPlaceHolder wasn't used by the current content page. Meaning a ContentPlaceHolder might not be referenced by the content page.What's the best way for the master page to iterate through its ContentPlaceHolders and find out which ones haven't been used by the current content page? Looking for a solution that does not involve any communication from content page to master page.
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Sep 22, 2010
I've created two datasources, one that gets a list of categories and it's id's and the other one get subcategories and it's id's. The categories are presented in a DropDownList and the subcategories in a ListBox. When choosing a category from the DropDownList the ListBox presents the subcategories of the chosen category. The subcategory datasource is set to get it's value for what category to get from the DropDownList's selected value.
My problem is that when I change the category in the DropDownList the subcategories doesn't update on a postback. Instead I have to press a button on the page that I know performs a postback to get the subcategories to update. What am I doing wrong here? I'm using this method on another page as well and when comparing them I can't find anything different. Any ideas?
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Sep 24, 2010
i am using wizard control in content page.if i use it in normal aspx it works.but not in content page.i use same code for aspx and content pages
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May 13, 2010
I've some really strange behaviour with a simple ASP.NET Button. Here's my code:
[Code]....
For some reason the first time I click this button, the code is beeing fired. When login credentials are wrong, a message shows up. THen, the user inserts the right credentials. After clicking the 'cmdLogin' button, nothing happens and the old (wrong) values are beeing filled in inside the textboxes. This behaviour occured to me after switching to ASP.NET 4.0.
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Aug 15, 2010
If I go to a content page on my website and enter some data into a textbox, then BEFORE I move focus from that control I press ENTER on the keyboard, the page_load event registers a postback event which in turn passes control to the Master page's page_load event where another postback=true is registered and THEN control goes to the first button on the Master page which is HOME, and then incorrect processing results. Autopostbacks are set to False on the textboxes. If I do not key data into any textbox and press ENTER on the keyboard, I correctly stay within the form
If I use the mouse or tab to navigate thru the textboxes, fill them in and press the Submit button, everything works fine. I cannot see why entering data into the textboxes triggers this action, and even so, why control does not return but instead gets 'lost' on the Master page.
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Mar 11, 2011
I am trying to save HTML content in a database. I have it stored properly but when I try to call it and display it on a page using a literal or label control, it does not show the content properly. It will show the text but not any HTML content (i.e. checkboxes, images, hyperlinks, etc)
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Sep 2, 2010
IŽll try to describe the problem in steps, as this might be the easiest to understand:
1. Page_Load is called when the page is requested, and calls a BuildTable() method
2. The BuildTable method creates a table which contains several textboxes
3. the user types some text in these textboxes
4. The userthen changes an item in a Dropdownlist on the page which is intended to change some other content on the page
5. Page_Load is called, and afterwards the DropDownListBookingType_SelectedIndexChanged(object sender,EventArgs e) method are called, and the content is changed
6. The text the user typed in the programmatically created textbox controls are lost!
Now how do I remain this text information? If just the SelectedIndex_changed method was called first, I could save it in session.. But as far as I can tell, all data on the page are discarded when you create a partial postback :(
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Dec 23, 2010
(Example code below)
I have a GridView. It has a 'static' TemplateField (in the .aspx page). I add and remove BoundFields to it depending on user preferences on postback. Affter the second postback, the template field appears empty.
Here is a stripped down mockup of what I'm doing. You can click the "Regular Postback" button as much as you want, and nothing bad happens. But if you click the "Recreate" button once-- it's all ok. Click it again, and the "one" column goes on Christmas break.
So is there something else I should be doing, or is this going to be a "halcyon1234 to code interface" error.
[Code]....
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Apr 2, 2010
I created an application which has a menu where it's items are created dynamicly. The menu acts as a language menu.
<body runat="server">
<form id="Form1" runat="server">
<table class="TableLayout">[code]...
I use session variables to set my current language.however if I click on the menu to change the session variable:
public void LanguageMenu_MenuItemClick(Object sender, MenuEventArgs e)
{
Session["language"] = e.Item.Text; [code]....
The thing is the content doesn't change, only after I click on something else.If I skip through my code after clicking on the menuItem I can see that it passes the code and it should change, however for some reason the page needs another extra trigger to modify it's content.I also see the page reloading so I don't understand why it's not changing immediatly. I guess I'm not understanding the asp.net logic just quite yet.
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Mar 3, 2010
I have a ASPX page, on this page there are two dropdown list, one button and one gridview. When the pages is loaded,these two dropdown would bind data from sql server. Then you select items from these two dropdown list, then click Button A to get data from sql server based on these two dropdown list, rendering the data using gridview. There is another Button, Button B. Then I click the Button B to do something, like send mail. But the page becomes the first time it's loaded, the content disappeared after postback. How can I keep the content after I click the Button B?
void SendInvitationMail_Click(object sender, EventArgs e)
{
send mail here
}
void QueryButton_Click(object sender, EventArgs e)
[Code]....
After I click the Query Button, it would get bind the data to gridview, then I click the Send Mail button. I want to keep all the result even I click the Send Mail button.
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Aug 3, 2010
I created a form in a popup div, that contain an UpdatePanel with ImageButtons in it.Initially, I used LinkButtons to test but I wanted ImageButtons. The thing is, it works well with LinkButtons and not with ImageButtons (absolutely nothing happens).
<a href="javascript:WebForm_DoPostBackWithOptions(new
WebForm_PostBackOptions("ctl00$cphC$ctrlAdr$AdrMapo$lbAdresseSaisie",
"", true, "",
"", false, true))"
id="ctl00_cphC_ctrlAdr_AdrMapo_lbAdresseSaisie">test</a>
[code]...
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Apr 24, 2010
I'm trying to use the ImageButton control for client-side script execution only. I can specify the client-side script to execute using the OnClientClick property, but how do I stop it from trying to post every time the user clicks it? There is no reason to post when this button is clicked. I've set CausesValidation to False, but this doesn't stop it from posting.
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Jan 18, 2010
I have just found the solution. The following function works (remove the else part):
function confirmSubmit() {
if (Page_ClientValidate("Group1")) {
return window.confirm("Are you sure to submit the form?");
}
}
But I am wondering why it doesn't work when I add the else part.
Question:
I want to have a confirm dialog after user fills in all the data in the form. I set onclientclick="return confirmSubmit()" in the submit button.
function confirmSubmit() {
if (Page_ClientValidate("Group1")) {
return window.confirm("Are you sure to submit the form?");
} else {
return false;
}
}
If Page_ClientValidate("Group1") returns false, the dropdownlist doesn't cause postback after I first select the item, and the postback only occurs when I select the dropdownlist second time.
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Apr 27, 2010
Any idea why my web page content doesn't resize with the window?I'm not using fixed position - just a table with width="100%".I've put it in a placeholder
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Dec 17, 2010
I have very simple validation on the aspx page (highlighting not valid textbox), and it works perfectly. But when I try to work with this page using MasterPage, I've got an error - "Object reference not set to an instance of an object." (with reference to the line "aControl.BackColor=Drawing.Color.White" - underlined).
Here is the code of the content page.
<%@ Page Title="" Language="VB" MasterPageFile="~/MasterPage.master" CodeFile="testValid.aspx.vb" Inherits="testValid" %>
[Code].....
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May 11, 2010
Why with LinkButton doesn't work postback with IE7 and work with FW3.+ when site work on IIS7?
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