postbacktrigger

Greetings,

what is the benefit of the postbacktrigger within the updatepanel if it makes a a full postback?

since the updatepanel is specific for asynchronous postback!!!!

your help is highly appreciated

best regards.

Some controls aren't supported in update panels, so you may want to do a full postback if something happens that will cause that control to change. We had to do this with the report viewer..

PostBackTrigger control to enable controls inside anUpdatePanel to cause a postback instead of performing an asynchronous postback.

http://asp.net/AJAX/Documentation/Live/mref/T_System_Web_UI_PostBackTrigger.aspx

Thank you for the support.

so if some some controls needs to cause a full postback within updatepanel so what is the benefit in this case to use the updatepanel??

your help is highly appreciated

Best regards.

At one point a lot of the controls that aren't supported in update panels did work inside update panels, but as of the Beta releases, the update panels were changed, so it may have been to ease the transition for people who had been using previous version...as we had been doing..

There may also be some cases that other content in the update panel can be refreshed asynchronously, although it has been a while since I have worked a lot with the controls that aren't supported.

Thank you for the support

But i don't understand exactly what you say ,so you can give more details??

your help is highly appreciated

Best regards.

There were CTP releases generally monthly that were public a little over 6 months before the first Beta release. Around the second of the CTPs, the releases started to have good support in the forums and documentation, and the releases were able to be used in production websites. When Beta 1 came out, the asyncpostback changed with update panels. Upgrading to the Beta releases could take a lot of time because of the change. Most of our major issues were solved by using a different control. We ended up using the full post back in a web application we had, which was a very large page of about 5000 lines of code for the aspx and cs files. There were three different versions of that page, which all have nested update panels. In a couple of the nested panels we needed to have report viewers. All this was also live at the time that Beta 1 came out, and many different users were already used to the system, so we couldn't change it too much. Using the full postback trigger allowed us to have a button to make the report viewer visible while allowing everything else on the page to still update asynchronously.

Hopefully that helps.

Postbacktrigger problem

I am creating a vb.net/asp.net 2005 app using a tabcontrol and I am trying to use a button inside the updatepanel and inside the tab and I am using the following syntax:

<CODE>

<asp:UpdatePanelID="pnlTest"runat="server"RenderMode="Inline"UpdateMode="Conditional">

<Triggers>

<asp:AsyncPostBackTriggerControlID="TabContainer1"EventName="ActiveTabChanged"/>

<asp:PostBackTriggerControlID="btnPreview"/>

</Triggers>

<ContentTemplate>

....everything else here...tab control...

</ContentTemplate>

</CODE>

But I keep getting an error as follows:

<ERROR>

A control with ID 'btnPreview' could not be found for the trigger in UpdatePanel 'pnlTest'.

Description:An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details:System.InvalidOperationException: A control with ID 'btnPreview' could not be found for the trigger in UpdatePanel 'pnlTest'.

</ERROR>

I am very confused because I know the control is there and when I go to the vb code-behind I am able to see the code in the dropdownlist that contains all controls for the aspx page. Does anyone have an idea what I'm doing wrong? thanks

Since your button is in the UpdatePanel you do not need to create trigger for it.

Hi Myroncope,

Here is my sample code which was written in c#. It has been tested and works fine. If you install a tool named "Web Development helper", maybe an error dialog will be sent to you, don't mention it.Press continue!

<%@. Page Language="C#" AutoEventWireup="true" CodeFile="UpdatePanelTest2.aspx.cs" Inherits="UpdatePanelTest2" %><%@. 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"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <asp:UpdatePanel ID="UpdatePanel1" runat="server" RenderMode="Inline" UpdateMode="Conditional"> <Triggers> <asp:AsyncPostBackTrigger ControlID="TabContainer1" EventName="ActiveTabChanged" /> <asp:PostBackTrigger ControlID="btnPreview" /> </Triggers> <ContentTemplate><%=DateTime.Now.ToString()%> <cc1:TabContainer ID="TabContainer1" runat="server" OnActiveTabChanged="TabContainer1_ActiveTabChanged" AutoPostBack="True" > <cc1:TabPanel ID="TabPanel1" runat="server" > <HeaderTemplate> 1111</HeaderTemplate> <ContentTemplate><%=DateTime.Now.ToString()%></ContentTemplate> </cc1:TabPanel> <cc1:TabPanel ID="TabPanel2" runat="server"> <HeaderTemplate> 2222</HeaderTemplate> <ContentTemplate><%=DateTime.Now.ToString("yyyy-MM-dd")%></ContentTemplate> </cc1:TabPanel> </cc1:TabContainer>  <asp:Button ID="btnPreview" runat="server" Text="btnPreview" /> </ContentTemplate> </asp:UpdatePanel> </form></body></html>

 By the way, my AJAX Control Toolkit version is 10618. If an error occured while you execute the code above. Suggest you check your AJAX Control Toolkit version.

If the error information still exist, please let me know.

MyronCope:

I am very confused because I know the control is there and when I go to the vb code-behind I am able to see the code in the dropdownlist that contains all controls for the aspx page. Does anyone have an idea what I'm doing wrong? thanks

Are btnPreview visible?

You could also try to use the ClientID or UniqueID value of btnPreview for postbacktrigger's ControlID attribute. Maybe one of them works.

And finally you could also tryRegisterPostBackControl(Control) method of scriptmanager in code-behind.

Hi, MyronCope

You can add an invisible button out of the updatePanel,set the invisible button as aPostBackTrigger of theUpdatePanel.

Then on the client-side click event of the 'btnPreview', trigger the click event of that invisible button.

<div style="visibility:hidden"><asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" UseSubmitBehavior="false" /></div>

<input type="button" onclick="javascript:document.getElementById('Button1').click();" name="Button1" value="Button" id="'btnPreview'" /></div>

The same solution solved all of this kind issue!

Check the following links:

http://forums.asp.net/t/1116956.aspx

http://forums.asp.net/t/1117770.aspx

http://forums.asp.net/t/1115934.aspx

http://forums.asp.net/t/1116851.aspx

Hope this helps.

Let me know if you need more info.