C# - How To Use AutoPostBack Inside UpdatePanel

Sep 24 10 at 1:31

I have two DropDownLists inside an UpdatePanel.

The values shown inside the second are dependent of the selectedValue on the first, so, I need AutoPostBack=true.

But, whenever the selected value in the first DropDownList is changed causes the UpdatePanel reload.

How can this be solved?

PS.: The UpdatePanel's UpdateMode property is set to Conditional.


AJAX :: TextBox AutoPostBack Inside UpdatePanel?

Jul 29, 2010 04:10 PM

I have two textboxes insie an updatepanel, the same update panel also has a trigger from a Clear Button from the other update panel. The first Textbox AutoPostBack is set to true. The first time when the textchanged event is fired, everything work as expected--the labels got populated, the focus is set to the second textbox. However after I click on the Clear button, i entered something to the first Textbox, its TextChangedEvent fires--the labels got populate, the focus seems set correctly to the 2nd textbox, but I
cannot enter anything to the second TextBox. it seems like the form is not active--when i hit tab, I expect the focus move to next control, instead it moves to the URL box. Turn off the AutoPostback then put a button next to the first textbox will fix the problem, but I am wondering if there is other workaround to keep the AutoPostback of the 1st textbox?

I am using IE8, here is a simple test page:


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AJAX :: Multiview Inside Updatepanel, Updatepanel Inside View?

Apr 25, 2006 08:41 PM

Has anyone gotten this to work? I have a multiview inside an updatepanel, and I can switch tabs without a screen repaint. But then, in one of the views I tried to put an updatepanel to update something in that view and it started freaking out. (probably for similar reasons to the freakout when I tried to put an updatepanel inside the itemtemplate of a repeater)

For example, I want a view to enter billing information, but then I want to dynamically hide the states dropdown if you pick a country other than US, CA or AU. At first it told me that my trigger had to reference a valid control, so I set it to the name of my country dropdownlist. It accepted that but then it gave me an object expected javascript error. Quite frankly, my brain is about to explode from trying to wrap it around this stuff.

So, I'm going to skip the idea of hiding the state DDL and just have a default option "select if appropriate" and move on with my life. But consider this an FYI to you boys (and girls) on the atlas development team.

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How To Avoid UpdatePanel Scrolling On AutoPostBack

Mar 1 at 7:34

I have an ASP.NET FormView within an updatepanel. I'm auto-saving the form by setting AutoPostBack=true for each of the items within the FormView.

This means the user can click a few elements in quick succession and fire off a few async postbacks almost simultaneously.

The issue I have is that the user is able to keep scrolling down the form while the async postbacks are not yet complete. The browser always scrolls back to the position it was in at the first postback.

Page.MaintainScrollPositionOnPostback is set to False.

I've tried all sorts of things in ajax and jquery with:


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AJAX :: Losing Focus After AutoPostBack In UpdatePanel?

Feb 21, 2007 01:58 AM

I have a checkbox inside an update panel with its AutoPostBack value set to true. When I click it, it performs the postback operation successfully but then loses the focus. I've tried setting a variable to store the value but the Page_Load event just sees a null value there. I need to be able to preserve the focus after a partial page postback and it's just not working right now.

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AJAX :: AutoPostback In Repeater In UpdatePanel Is Refreshing The Page?

Aug 31, 2010 10:47 AM

I've got a TextBox with AutoPostBack="true" and OnTextChanged property set.

The textbox is located inside a Repeater, which in turn is located inside an UpdatePanel.

Problem is - whenever the TextBox postsback, the whole page gets reloaded, instead of the UpdatePanel only.

Here's how the thing looks:


Interesting thing is, if I take the TextBox out of the repeater, it refreshes only the UpdatePanel. So is if I put a Button inside the repeater - only the UpdatePanel gets refreshed. But whenver I place an AutoPostBack-ing control inside the Repeater, the whole page gets refreshed.


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AJAX :: DropDownList Inside A TemplateColumn Inside A GridView Inside A UpdatePanel?

Apr 26, 2007 04:11 PM

I have a DropDownList inside a TemplateColumn inside a GridView inside a UpdatePanel. (out of breath saying that)

I have the DDL's AutoPostBack set to true and the OnSelectedIndexChanged event set to an event in my code. The problem is when the DDL's index changes, it posts back. It does not do the UpdatePanel magic and not post the whole page back, and the OnSelectedIndexChanged event does not fire. Anyone see anything wrong with my approach?



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Web Forms :: Hooking Dynamic Controls Inside An Updatepanel As An Asynctrigger To Another UpdatePanel?

Oct 07, 2010 08:36 PM

I have two update panels and one javascript control.

When the javascript button is clicked, it forces a partial postback on UpdatePanel2. UpdatePanel2 is populated with dynamically created buttons that have javascript effects (jquery) but when click can also induce a postback. My problem is that, when clicking on these dynamic buttons, the whole page does not do a partial post back but rather UpdatePanel2 itself does a partial postback and everything is gone.

However, what I want to do is be able to tie each of the dynamic buttons in UpdatePanel2 (After being dynamically created) and make them an asychnonous triggers to UpdatePanel1. So that when clicking on these dynamic buttons, ONLY UpdatePanel1 is doing a partial postback refresh. UpdatePanel2 stays put and remains the same.

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UpdatePanel Returns Error When Click On Linkbutton Which Is Inside UpdatePanel

Mar 26 10 at 12:25

i have Linkbutton inside updatePanel and when i click on it it returns following error

An extender can't be in a different UpdatePanel than the control it extends

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Web Forms :: Script Inside Updatepanel Disappears On Update Of Updatepanel?

Feb 14, 2011 04:48 PM

I have a script inside an updatepanel. This script needs to be inside the updatepanel as it must be located in that spot.

Now when we click the "LinkButton" to update the updatepanel, the script will dissapear.

It seems that the script only is initiazed on the first Page_Load and Refresh of the page.

How can we keep it when pressing the "LinkButton"?

Complete code is below:


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AJAX :: Cannot Bind Dropdownlist Inside From Button Click Inside Updatepanel

Sep 24, 2010 05:17 AM

I have a gridview inside UpdatePanel.

Inside gridview there is a dropdownlist and a button on each row. On button click I am opening a panel through Modal popup extneder.

Inside that pop up there is again a dropdownlist. I am adding an item into this dropdownlist based on the selection from the dropdown inside gridview.

like ddl.items.insert(0,'xyz');

But first time this inserted item is not getting reflected in the dropdownlist. But after one postback this item is getting reflected.

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Forms Data Controls :: DropDownList Inside GridView Inside UpdatePanel SelectedIndexChanged Event Not Firing?

Aug 16, 2010 02:25 PM

I have an UpdatePanel with a GridView. This GridView has a template column that is a DropDownList. The problem is that the SelectedIndexChanged event does not fire for the DropDownList. Here is the code:


The codebehind:


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AJAX :: Html Inside TextArea Inside UpdatePanel Causes 500 Error?

Nov 29, 2006 10:10 PM

If you create a text area control and enter the html into it the update panel fails to refresh with 500 error. In the very simple example below this is demonstrated. If you click "Submit Form Button" you will get javascript error:

"Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500"

If you remove html, no error occurs. I'm surprised that no one reported this yet (i saw some posts about FCKEditor and other editors, but even if the most basic control like textarea does not work, i would not expect FCKEditor to work correctly).



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AJAX :: Editing Image Inside DetailsView Inside UpdatePanel?

Oct 04, 2010 02:14 PM

I'm trying to add and edit an image which is located in a detailsview which is inside an UpdatePanel. After I read relevant topics in the forum I installed the Ajax Control Toolkit. Below is my source code. When I used it only for insert new image it worked great. The problem caused when I tried to implement it on the Edit mode, i.e. when I tried to edit the image and upload a different image. Unfortunately it didn't work as I hoped. Nothing happend and the image hasn't been changed. I also tried to change the IDs (AsyncFileUpload ID) to be the same in both places but it didn't work either.

The source code:

<asp:DetailsView ID="dvMovie" runat="server" Height="50px" Width="695px"
AutoGenerateRows="False" DataSourceID="sdsMovieById"
BorderColor="#E7E7FF" BorderStyle="None" BorderWidth="1px" [code].....

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Forms Data Controls :: Disable Autopostback Of Checkbox Inside Of GridView During SelectedIndexChanged Of ListView

Sep 08, 2010 12:44 PM

I have a checkbox placed inside a gridview:

<GridView><asp:TemplateField HeaderText="Driver"> <ItemTemplate> <asp:CheckBox ID="CheckBoxDriver" AutoPostBack="true" OnCheckedChanged="GridView_Persons_SelectedIndexChanged" ValidationGroup='<%# Eval("ID") + "-" +((GridViewRow)Container).RowIndex %>' CssClass="CXDriver" runat="server" Checked='false' /> </ItemTemplate> </GridView>

For example: A listViewItem 1 has 3 drivers are checked, A listViewItem 2 has 2 drivers are checked.

Therefore, if changing the selectedIndex of the list, the checkbox indexChanged event will be fired.

How could I disable the autopostback of the checkbox during the listview item changed.

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AJAX :: AsyncFileUpload Inside A GridView Inside An UpdatePanel?

Oct 03, 2009 04:05 AM

I'm in a situation where my users want to edit a record in a GridView and one of the fields they will be editing is an uploadable pfd file. I have the GridView inside an UpdatePanel and a field's EditItemTemplate has the AsyncFileUpload control. So ater the user uploads a new file and clicks the LinkButton that send the Update command, I get to the RowUpdating event only to find that the AsyncFileUpload has no file.So I figure I might have to save the file in the session when the file completes uploading. Since the AsyncFileUpload control is dynamically created by the gridview, I programatically added the the event hander for the UploadCompleted event to the AsyncFileUpload control during the RowCreated event. This time the UploadCompleted event didn't fire and there was still no file during the RowUpdating event. I then tried to add the handlers on the RowDataBinding event and UploadCompleted was still not firing. Has anyone successfully used this control inside a gridview like this?

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Using JS Event Handlers Inside A Wizard Inside An Updatepanel?

Feb 28 10 at 20:04

I've got a textbox being used to enter a password inside a wizard control. I'm trying to get a password strength meter working with it.

Unfortunately, the password box isn't visible until step 4 and this means that I can't register the event handler onload() and putting some JS next to the PW box to register the event handler doesn't seem to fire. I'm guessing this is due to the contents of the wizard being loaded through an AJAX postback.


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C# - UpdatePanel's PostbackTrigger That Is Inside A Usercontrol Inside A Masterpage?

Feb 24 at 18:53

I have a masterpage and inside that masterage is a user control that has a toolbar with a save button. I then have an aspx page that inherits form t he master page. In that page I have and updatepanel. Is it possible to set the post back trigger to the Save button inside the usercontrol?

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Web Forms :: How To Stop Autopostback For A Selected Values In Autopostback Enabled Dropdown

Mar 29, 2010 07:28 AM

I am using an asp.net autopostback enabled dropdown list. Here i want to restrict the autopostback property fot the value "Select" in the ddl. I have used javascript for this purpose. but not working.My code look like this.


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C# - Works Out Of UpdatePanel But Not Inside UpdatePanel?

Mar 28 10 at 17:13

I have copy and paste this Alert Class:[URL] It works except with a button inside an update panel but it shows no error. The asp code inside is executed but nothing shows up on client side.

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Forms Data Controls :: Button Inside Gridview Is Not Working When Gridview Is Inside Updatepanel

Nov 12, 2009 01:21 PM


button inside gridview is not working when gridview is inside updatepanel

aspx code


Receive button is a download button,it retrieves the url from thetable when user clicks on it,it works fine when gridview is not insideupdatepanel but error is generated when use gridview inside updatepanel

protected void GridView2_SelectedIndexChanged(object sender, EventArgs e)


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C# - PopupControlExtender Inside UpdatePanel?

Jun 15 10 at 16:35

So i use PopupControlExtender (to edit some of the fields) inside ListViewControl which itself is embeded inside an UpdatePanel.

The problem is as follows whenever you cause partail postback the popup panels are created client side outside the updatepanel. And you get more clientside controls with the same clientside ID. When you postback with popup panel the server side control eg. Texbox has Text = clientsidecontrol1.text, clientsidecontrol2.text, clientsidecontrol.text3

Is there a way to prevent this.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test.aspx.cs" Inherits="Secure_Test" %>
<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


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Asp.net - ScriptControl Inside UpdatePanel

Oct 21 10 at 16:44

I have a ScriptControl (requires ScriptManager) with JavaScript to handle client-side interactions and ICallbackEventHandler to communicate back and forth. Everything works perfectly with one or multiple instances of the control on a page. I placed the control inside a GridView with sorting and it still works. However, I place the GridView in an UpdatePanel and now whenever I sort I get the following error for each instance:

Sys.InvalidOperationException: Two components with the same id 'GridView_ctl02_MyControl' can't be added to the application.

Can someone point me in the right direction on how to solve this? I am assuming ScriptManager is not disposing of the old Sys.UI.Control objects before trying to $create() the new ones with the same ID. I thought the UpdatePanel/ScriptManager combination would automatically take care of disposing objects that would be replaced?

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Placeholder Inside An UpdatePanel?

Nov 10 10 at 15:25

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">


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C# - UpdatePanel Inside Repeater?

Mar 28 at 11:53

In my UserControl, Im trying to update a updatepanel that is inside a repeater like this:


<asp:UpdatePanel ID="updDocumentQuickView" runat="server" UpdateMode="Conditional">
<asp:Repeater ID="repFolders" runat="server"


The end result I get is that updDocumentQuickView is the UpdatePanel that gets updated, and not updFiles. If i wrap an UpdatePanel around lnkFolder, then that UpdatePanel gets updated, with the same C# code. Ive checked what kind of data that are sent back with fiddler, and the wrong UpdatePanel is sent. Im getting the correct RepeaterItem, and both repFiles and updFiles are found. What do I miss to get the right UpdatePanel to get updated?


Hawxby solution solved the problem with updDocumentQuickView getting updated, thanks for that. But im still having problems with updFiles sending nothing back. Some further testing, with putting literals inside updFiles and working, tells me that theres something with repFiles that isnt returned. repFiles does have data that is bounded.


repFiles.Visible were set to false in repFolders_OnItemDataBound, no wonder it didnt show.

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Updatepanel Inside Modalpopup Not Working?

Jun 22nd, 2010, 11:11 PM

I'm doing a website with Ajax and Framework3.5.

I have a update panel inside a modalpoupextendar which is in another update panel.

When user need to click the button in the parent update panel the modal popup will appear,

then in the popup if user click a button there I Need to show some text in a user control which placed in the panel.

See the html tag and tel me any solution. Its not working for the first click its working in the second click only.


<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="False">
<asp:Button ID="btnHidden" runat="server" Text="Button" />
<cc1:ModalPopupExtender ID="ModalPopupExtender2" runat="server" BackgroundCssClass="modalBackground"
BehaviorID="popup" DropShadow="true" PopupControlID="pnlUpdate" CancelControlID="btnNo"
<asp:Panel ID="pnlUpdate" runat="server" CssClass="modalPopup" >
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Always">
<uc1:Feedback ID="Feedback2" runat="server" />
<asp:AsyncPostBackTrigger controlid="btnTest" eventname="Click" />
<asp:Button ID="btnTest" runat="server" Text="Test" onclick="btnTest_Click" />
<asp:Button ID="btnNo" runat="server" Text="Cancel" /></div>

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Dropdown Inside Updatepanel - How To Set To Fire

Sep 15th, 2010, 01:23 AM

I am using Asp.Net 3.5. I am having two problems in dropdown inside the update panel. I have two drop down list. First dropdown i loaded the data from db. Its working fine. Once i changed the data using SelectedIndexChange event it's firing first time(i put AutoPostback="true") if i click multiple times for multiple data it's not fired. If changed the value i bind the data to another dropdown list. But it is not binding. My control is inside the update panel. What is the problem? i came across multiple site and try it.But no use? Its very urgent. I put the code here.



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ImageButton Postbacks Even When Not Inside UpdatePanel

Nov 19, 2010 08:39 AM

I am having a custom ASPX page with following structure. Its having 2 update panel and I have a ImageButton outside them. The two UpdatPanel are triggered by this ImageButton.The Problem is whenever user clicks the Imagebutton, the image in the ImageButton is getting reloaded...it disappears and the reappears. I am not able to figure out why the postback is happening when the imagebutton is place outside UpdatePanel. Is it because I am using this Imagebutton for triggering AsyncPostBack in UpdatePanel?


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AJAX :: How To UpdatePanel Inside EditItemTemplate

Jul 02, 2010 12:22 AM

I am using a third party control that upload images. It works fine when i place it on aspx page (Outside DetailView) but I want to place that functionality inside EditItemTemplate but it just never work .


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AJAX :: ModalPopupExtender Inside UpdatePanel?

Apr 15, 2010 01:22 PM

I have a menu of buttons inside an UpdatePanel (UPD_Menu) so that buttons can be enabled/disabled without refreshing the entire page. When a user signs in, the Sign Up button is disabled and the Profile button is enabled. Likewise, when the user signs out, the Sign Up button is enabled and the Profile button is disabled.

Inside this UpdatePanel (UPD_Menu), along with the buttons, is a ModalPopupExtender that is fired by the Sign Up button (TargetControlId="BTN_MenuSignUp") that pops up a dialog Panel (PNL_SignupProfile) that contains yet another UpdatePanel (UPD_SignupProfile) that contains a Submit button as well as a Cancel button (CancelControlId="BTN_SelectCancel").

The behavior I am getting is when the user clicks no other button than the Sign Up button, the dialog (PNL_SignupProfile) pops up and is modal. The Submit button closes the dialog and makes the once-hidden panel appear under the menu of buttons. This is not good as only the inner UpdatePanel (UPD_SignupProfile) should be updated without affecting the outer UpdatePanel (UPD_Menu). The Cancel button works as it should by simply closing/hiding the dialog.

If a user clicks any other button in the menu first, nothing happens ( no codebehind yet) but when the dialog (PNL_SignupProfile) is shown, the Cancel button causes the hidden Panel (PNL_SignupProfile) to appear under the buttons. I've tried many different things to no avail...including putting the dialog panel in different places and even controlling the ModalPopupExtender from code.

The only code I have so far is for handling the signin/signout and enabling/disabling the signup and profile buttons based on user signin. There is no code yet to handle the menu of buttons nor the submit button of the popup dialog.

Here is the code:





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C# - How To Set SelectedValue Of DropDownList Inside UpdatePanel

Apr 1 at 20:54

I've got a set of cascading dropdowns, but I want the default selectedvalue to be there when when page loads though.Right now, my dropdownlist is defaulting to the first value in the DDL.
(ASP.NET C#) and the code (issue is with the "DDL_Assignment" dropdown).


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How To Get An UpdatePanel Inside Fancybox Working

Oct 25 10 at 7:08

I'm using fancybox to display the contents of a div when clicking a link. This works using the code below:

<a id="popupTrigger" href="#popup">popup trigger</a>
<div style="display:none">
<div id="popup">
<asp:UpdatePanel ID="HerkomstCodeUpdatePanel" runat="server" UpdateMode="Conditional">
This content displays inside fancybox.
<asp:TextBox ID="CurrentTimeTextBox" runat="server"></asp:TextBox>
<asp:Button ID="RefreshContentButton" runat="server"></asp:Button>

And the JScript:

$(document).ready(function () {
autoDimensions: false,
height: 250,
transitionIn: 'elastic',
transitionOut: 'elastic',
width: 400

Now what I'm expecting it would do is that when you click the button (which is displayed inside fancybox) it would update the textbox and do whatever I define it to do in the codebehind. Unfortunately nothing happens when I click the button.

I've tried to trigger a __doPostback myself passing the ClientID of the updatepanel and/or the button itself. I can't seem to trigger the event in the codebehind however.

The thing is if I remove the fancybox, the updatepanel works as expected. So I am guessing if I can somehow find out what eventhandler logic is behind the button before I create the fancybox, I might be able to recreate the eventhandler logic after attaching fancybox? I just can't find it anywhere...

I am using ASP.Net WebForms 3.5 and JQuery 1.4.1


I got it to trigger the codebehind button_click event by overriding the clientside click event on the button using the code below. The key is in using the name of the button as the sender object for the __doPostBack event. The only problem that remains is that all other values aren't posted back anymore. If I type anything in the textbox, click the button, my codebehind doesn't know what's in the textbox anymore.

//.... other options,
onComplete: function () {
$("#RefreshContentButton").click(function () {
__doPostBack($(this).attr('name'), '');

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Cannot Access The Controls Inside An UpdatePanel

Dec 23 09 at 18:00

What I am trying to Do is accessing Page Controls at Page_Load, and make a database query, and make controls visible or not visible.

Here is the Code


My Problem is with the UPcontrols ! IT should retrieve the controls within the UpdatePanel, but the thing is it doesnt do its Job except in the Debug Mode !!! ... When I add a breakpoint everything is OK ! ... but when I run the web application it doesnt find any components within the UpdatePanel ...

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C# - Fileupload Inside Updatepanel Which In Usercontrol?

Oct 4 10 at 8:20

i am doing Fileupload using asp.net 3.5 with asp.net ajax.In that i am using Usercontrol MainPage.ascx Page:In this page i am using UpdatePanel inside Fileupload control. Demo.aspx:In this page also i am using Updatepanel. i am drag MainPage.ascx usercontrol inside this UpdatePanel which is in Demo.aspx. Question: When i drag the Mainpage.ascx Usercontrol on Demo.aspx. Here i am getting the Fileupload.HasFile is getting null .If anybody knows Plz.

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AJAX :: FileUpload Inside UpdatePanel

Dec 01, 2010 02:24 AM

I am using FileUpload control inside UpdatePanel, but cant get it working and keep getting error : "Object reference not set to an instance..." on line: If fuAvatar.PostedFile.FileName <> "" Then I have checked several forum and people mentioned that we need PostBackTrigger but i just cant get it working and keep getting the "Object reference not set..." error. My FileUpload control is inside a panel and along with another control, and the upload occurs when user click on Finish button.


And my codebehind is:


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FileUpload In FormView Inside An UpdatePanel

Aug 24 10 at 11:26

I have an ASP.Net webpage which I intend to use for letting the user(not the real users, but content manager basically) insert and edit the records in a table using a FormView. This FormView is inside an UpdatePanel, as I'm also using cascading dropdownlists to let the user select some values. Now, this FormView also contains 4 FileUpload controls, and as you might know that these fileupload controls require a full postback since most browsers do not let Javascript access the disk. So, this problem would have been solved by doing something like:

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<asp:PostBackTrigger ControlID="InsertButton" />
<asp:PostBackTrigger ControlID="UpdateButton" />

Edit: Forgot to add that the fileuploading takes place in the OnUpdating and OnInserting events of the SqlDataSource. The Problem: Since the InsertButton and the UpdateButton reside inside the Formview, I cannot directly access their ID's through markup. And MSDN says that: Programmatically adding PostBackTrigger controls is not supported. A workable solution for me was to set the UpdatePanel's PostBackTrigger as the whole FormView itself:

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<asp:PostBackTrigger ControlID="FormView1" />

But now due to a bit of change in requirements, this solution(if you call it a solution) is not acceptable.

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AJAX :: Dropdowns Inside Updatepanel?

Dec 13, 2010 04:17 PM

I'm having a problem with a dropdown throwing an error:

Uncaught Sys.WebForms.PageRequestManagerServerErrorException:

Sys.WebForms.PageRequestManagerServerErrorException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.Only Sometimes.

I am using an updatepanel, with a bunch of dropdowns that have an onchange for Javascript, that use ajax (partial page postback). The problem is: I have two dropdowns at the top (also inside the updatepanel) that let me change the current month or year. Sometimes...they change the page (response.redirect), and sometimes they throw that error above. Also, they are the Only two buttons on the page that aren't doing an "onchange" and then ajax stuff....they are actually posting back the entire page to the server (or trying to).

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AJAX :: PlaceHolder Inside UpdatePanel?

Nov 08, 2010 09:51 PM

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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AJAX :: Updatepanel Inside A FancyBox?

Nov 21, 2009 03:23 PM

I have an issue with my wizard-form. Once a postback occurs inside an updatepanel (aka I click a button for the next page, which hides current panel and shows next), it doesn't work anymore.

It does work if I access my form directly (http://hostese.ide3.hr/Prijava.aspx), but it doesn't work if I go through Fancybox (http://hostese.ide3.hr/HostesePromotori.aspx, and then click "Prijavnica" black button).

ATM I am using ImageButton, but same thing happens with regular button as well.

Code is simple, OnClick event calls a method which hides all panels, except the one that is next to show. All 4 panels (3 for form and 1 for thank you message) are inside an updatepanel content template.

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AJAX :: Use An UpdatePanel Inside An AnimationExtender?

Apr 19, 2010 07:39 PM

I have an animationExtender, I have an update panel iniside of it with the updatemode Conditional and I have the button that triggers it, but whenever I click that button, the whole page reloads and the animationExtender closes. Why would it do that?

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