Search results matching tag '"AsyncPostbackTrigger"'

Live.com Technology

baha_ks — Thu, 22 Jan 2009 05:00:00 GMT

Hello Dears

i have a problem of understanding of live.com

my mean is :

if you see this page and its source

http://search.live.com/images/results.aspx?q=football&go=&form=QBIR

you don't see these scripts

1    <input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
2    <input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
3    <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJMjExMDQxMjg3ZBgBBR5fX0NvbnRyb2xzUmVxdWlyZVBvc3RCYWNrS2V5X18WBAUtY3RsMDAkY3RsMDAkYmNyJGJjciRQb3N0Rm9ybSRjdGwwNCRFZGl0b3JUYWJzBTVjdGwwMCRjdGwwMCRiaGNyJFNlYXJjaEZvcm0xJGN0bDAwJFRpdGxlQmFyU2VhcmNoVGV4dAU3Y3RsMDAkY3RsMDAkYmNyJGJjciRQb3N0Rm9ybSRjdGwwNCRjdGwxMCRjdGwwMiRJc0xvY2tlZAVAY3RsMDAkY3RsMDAkYmNyJGJjciRQb3N0Rm9ybSRjdGwwNCRjdGwxMSRjdGwwMiRTdWJzY3JpYmVUb1RocmVhZPyav0PbLGIvtyIf7iAjTHyzssUX" />
4    </div>
5    
6    <script type="text/javascript">
7    //<![CDATA[
8    var theForm = document.forms['aspnetForm'];
9    if (!theForm) {
10       theForm = document.aspnetForm;
11   }
12   function __doPostBack(eventTarget, eventArgument) {
13       if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
14           theForm.__EVENTTARGET.value = eventTarget;
15           theForm.__EVENTARGUMENT.value = eventArgument;
16           theForm.submit();
17       }
18   }
19   //]]>
20   
21   </script>
22   
23   
24   <script src="/WebResource.axd?d=cCvonavza7NGh4PxQfj5rw2&t=633527641956801634" type="text/javascript"></script>
25   
26   
27   <script src="/ScriptResource.axd?d=yAfuLkHezdUxHkg5zGWaR5YLI7MdNpNW2Enh5UzDCcJqFrs5DBAzz0JiL0Rve7aDydm8cUNPQtNJ6Bk8oE9pPGr9uOxQl5RivikKBqdy1601&t=181fac98" type="text/javascript"></script>
28   <script src="/ScriptResource.axd?d=yAfuLkHezdUxHkg5zGWaR5YLI7MdNpNW2Enh5UzDCcJqFrs5DBAzz0JiL0Rve7aDydm8cUNPQtMyCUu6dGZ9ryVrtNAbIsPc0&t=181fac98" type="text/javascript"></script>
29   <script src="/ScriptResource.axd?d=yAfuLkHezdUxHkg5zGWaR5YLI7MdNpNW2Enh5UzDCcJqFrs5DBAzz0JiL0Rve7aDydm8cUNPQtNl5zcjsgiNzZ5RjWn5MtbE3I-0hfcsDuQ1&t=181fac98" type="text/javascript"></script>
30   <script src="/ScriptResource.axd?d=yAfuLkHezdUxHkg5zGWaR5YLI7MdNpNW2Enh5UzDCcJqFrs5DBAzz0JiL0Rve7aDydm8cUNPQtNl5zcjsgiNzZ51Oe0-iPmGuylsFElV0oY1&t=181fac98" type="text/javascript"></script>
31   <script src="/ScriptResource.axd?d=MAAmWCzcsVqQp4nCsm9G3zz3qXqTBL1-FFo8h44MfLQSNnvVGWUbZqXvsng5oLeJYcNJy8NuO__I_v1tJkanZQ2&t=ffffffffaef1d7cf" type="text/javascript"></script>
32   
33   <script src="/ScriptResource.axd?d=Ae8mNaGYuaVitHKvqiheZAV6KhIPExcQt5OpMKbxVg7PKyGeGMH28hPNOVqK4X2meOJ5_fkSt7ZZbGjJSDKhv_8O4brTmNvVaE86TbsDJsY1&t=2116fd98" type="text/javascript"></script>
34   <script src="/ScriptResource.axd?d=MAAmWCzcsVo-a3qq_jq5AK_oI8KDkXD19E1DIHkB3nF63LR19ZOawTvVLmXYK5JjA6T3d-iYxo3lJbU0J2qWF0mc-X3ZfakA0&t=ffffffffee98555f" type="text/javascript"></script>
35   <script src="/ScriptResource.axd?d=MAAmWCzcsVo-a3qq_jq5AK_oI8KDkXD19E1DIHkB3nF63LR19ZOawTvVLmXYK5JjA6T3d-iYxo0D8Igr3sK-e8T5S9ee_rJZsz5m2sqhhvI1&t=ffffffffee98555f" type="text/javascript"></script>
36   <script src="/ScriptResource.axd?d=0Sa5v8YZh4tDucoyQFgV_vDy0-RgUa_jlfWgyLht4Ucjy5e6owGhTADWww6NUX-xnfyZPJiZrhWgBNkYy7s-6tmmkKU2fTHj0&t=76cdf98" type="text/javascript"></script>
37   <script type="text/javascript">
38   //<![CDATA[
39   function WebForm_OnSubmit() {
40   if (typeof(ValidatorOnSubmit) =="function" && ValidatorOnSubmit() == false) return false;
41   return true;
42   }
43   //]]>
44   </script>

but if you see www.asp.net page source you can see those,

why it is?

and i want to know what live.com's ajax technology is

does live.come use asp.net ajax framework?

if no, why and if yes, how?

thanks a lot

Re: UpdatePanel Problems, Child Controls Postback when they shouldn't

acunningham — Fri, 05 Sep 2008 04:00:00 GMT

Thanks for the reply, that does make sense and indeed that is the functionality that I'm after as I need to the child link buttons to postback in any case. I assumed the panel was updating again when the child linkbuttons fire the event as the UpdateProgress control displays. Each child linkbutton will should cause a Server.Transfer to happen but instead I get a client side error message and the transfer isn't happening, so I was assuming that AJAX was somehow intercepting the request, the error message is below:

Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled. Details: Error parsing near'

<!DOCTYPE html P'.

Regards,

Adrian.

UpdatePanel Problems, Child Controls Postback when they shouldn't

acunningham — Thu, 04 Sep 2008 04:00:00 GMT

Hi,

've got a search page with all the search criteria in the top half of the page with the search results grid at the bottom. I'm using a LinkButton to submit the search. The search results are contained inside the UpdatePanel on which I've set UpdateMode="Conditional" and ChildrenAsTriggers="false", the reason being I only want the search button to trigger the search and update the panel.

The first column of the DataGrid contains my Reference field which is a TemplateColumn that uses a LinkButton and DropDownExtender to display the Sharepoint style dropdowns. Each action of the dropdown will navigate to a different page in the application using Server.Transfer. However, clicking on the LinkButton always triggers the update panel which I don't want it to do and thought that ChildrenAsTriggers="false" would suppress this action.

Any ideas?

Thanks,

Adrian.

---

See code below.

Search Criteria

<asp:LinkButton ID="btnGoEnquiry" runat="server" OnClick="btnGoEnquiry_Click">Search</asp:LinkButton>
...

<asp:UpdatePanel ID="upnlSearchResults" ChildrenAsTriggers="false" UpdateMode="Conditional" runat="server">
    <ContentTemplate>
        <div id="Div1" class="DataGridSectionCS" align="left" runat="server">
                    <asp:DataGrid id="dgEnquiry" runat="server" CssClass="DataGrid" FilteringEnabled="False" cellpadding="2"
	            PagerStyle-Mode="NumericPages" PageSize="15" AllowPaging="True" FilterButtonText="Filter" AutoGenerateColumns="False" OnPageIndexChanged="dgEnquiry_PageIndexChanged" AllowSorting="True" OnSortCommand="dgEnquiry_SortCommand" OnItemCreated="dgEnquiry_ItemCreated">
	            <PagerStyle HorizontalAlign="Left" Position="TopAndBottom" Wrap="False" Mode="NumericPages" CssClass="PagerStyleVisited"></PagerStyle>
	            <AlternatingItemStyle Wrap="False" CssClass="row1"></AlternatingItemStyle>
	            <EditItemStyle Wrap="False"></EditItemStyle>
	            <FooterStyle Wrap="False" ForeColor="#000066" BackColor="White"></FooterStyle>
	            <SelectedItemStyle Font-Bold="True" Wrap="False" ForeColor="White" BackColor="#669999"></SelectedItemStyle>
	            <Columns>	
	                <asp:TemplateColumn SortExpression="ClaimReference" HeaderText="Claim Reference">
                        <ItemTemplate>
                            <asp:LinkButton ID="lnkClaimReference" width="150" OnClick="AJAXDropDownMenu_Click" Style='<%# DataBinder.Eval(Container.DataItem, "Color") %>' runat="server" CommandName='<%# DataBinder.Eval(Container.DataItem, "ClaimReference") %>'><%# DataBinder.Eval(Container.DataItem, "ClaimReference") %></asp:LinkButton>                                                
                            <asp:Panel ID="pnlDropDown1" runat="server" CssClass="ContextMenuPanel" Style="display :none; visibility: hidden;">
                                <asp:LinkButton runat="server" ID="ddeEdit1" Text="Edit" CssClass="ContextMenuItem" OnClick="AJAXDropDownMenu_Click" CommandName='<%# DataBinder.Eval(Container.DataItem, "ClaimReference") %>' />
                                <asp:LinkButton runat="server" ID="ddeClose1" Text="Close" CssClass="ContextMenuItem" OnClick="AJAXDropDownMenu_Click" CommandName='<%# DataBinder.Eval(Container.DataItem, "ClaimReference") %>' />
                                <asp:LinkButton runat="server" ID="ddeInquire1" Text="Inquire" CssClass="ContextMenuItem" OnClick="AJAXDropDownMenu_Click" CommandName='<%# DataBinder.Eval(Container.DataItem, "ClaimReference") %>' />        
                                <asp:LinkButton runat="server" ID="ddeDocuments1" Text="Documents" CssClass="ContextMenuItem" OnClick="AJAXDropDownMenu_Click" CommandName='<%# DataBinder.Eval(Container.DataItem, "ClaimReference") %>'/>
                                <asp:LinkButton runat="server" ID="ddePolicy1" Text="Policy" CssClass="ContextMenuItem" />
                            </asp:Panel>
                            <asp:Panel ID="pnlDropDown2" runat="server" CssClass="ContextMenuPanel" Style="display :none; visibility: hidden;">
                                <asp:LinkButton runat="server" ID="ddeInquire2" Text="Inquire" CssClass="ContextMenuItem" OnClick="AJAXDropDownMenu_Click" CommandName='<%# DataBinder.Eval(Container.DataItem, "ClaimReference") %>' />
                                <asp:LinkButton runat="server" ID="ddeReserves2" Text="Reserves/Payments" CssClass="ContextMenuItem" />
                                <asp:LinkButton runat="server" ID="ddeReopen2" Text="Reopen" CssClass="ContextMenuItem" />        
                                <asp:LinkButton runat="server" ID="ddeDocuments2" Text="Documents" CssClass="ContextMenuItem" OnClick="AJAXDropDownMenu_Click" CommandName='<%# DataBinder.Eval(Container.DataItem, "ClaimReference") %>' />
                                <asp:LinkButton runat="server" ID="ddePolicy2" Text="Policy" CssClass="ContextMenuItem" />
                            </asp:Panel>
                            <cc1:DropDownExtender ID="DropDownExtender1" runat="server" TargetControlID="lnkClaimReference" DropDownControlID='<%# DataBinder.Eval(Container.DataItem, "ClmSts") %>'></cc1:DropDownExtender>
                        </ItemTemplate>
                        <itemstyle Wrap="False" horizontalalign="Left" />
                    </asp:TemplateColumn>									    
		            <asp:BoundColumn SortExpression="Insured" DataField="Insured" HeaderText="Cedant">
			            <HeaderStyle Wrap="False"></HeaderStyle>
			            <itemstyle Wrap="False" horizontalalign="Left" />
		            </asp:BoundColumn>
		            <asp:BoundColumn SortExpression="UdrIns" DataField="UdrIns" HeaderText="Underlying Insured">
			            <HeaderStyle Wrap="False"></HeaderStyle>
			            <ItemStyle Wrap="False" horizontalalign="Left" ></ItemStyle>
		            </asp:BoundColumn>
	            </Columns>
	            <ItemStyle Wrap="False" CssClass="row0"></ItemStyle>
	            <HeaderStyle Wrap="False" CssClass="resultstableheader"></HeaderStyle>
            </asp:DataGrid>
            <br />
            <br />
        </div>
    </ContentTemplate>
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="btnGoEnquiry" EventName="Click" />
    </Triggers>
</asp:UpdatePanel>

...

    <asp:UpdateProgress ID="updProgress" runat="server" AssociatedUpdatePanelID="" DisplayAfter="0" DynamicLayout="true">
    <ProgressTemplate>
        <iframe frameborder="0" src="about:blank" style="border:0px;position:absolute;z-index:9;left:0px;top:0px;width:expression(this.offsetParent.scrollWidth);height:expression(this.offsetParent.scrollHeight);filter:progid:DXImageTransform.Microsoft.Alpha(Opacity=75, FinishOpacity=0, Style=0, StartX=0, FinishX=100, StartY=0, FinishY=100);"></iframe>

        <div id="progress" style="position:absolute;z-index:10;left:expression((this.offsetParent.clientWidth/2)-(this.clientWidth/2)+this.offsetParent.scrollLeft);top:expression((this.offsetParent.clientHeight/2)-(this.clientHeight/2)+this.offsetParent.scrollTop);">
            <center>Please Wait...<br /><br />
                <img src="Images/bigsnakeloader.gif" />
            </center>
        </div>
        
    </ProgressTemplate>

Updatepanel in Gridview TemplateField column

belcrant — Tue, 29 Apr 2008 04:00:00 GMT

Hi everybody,

My purpose is to take a selected row from another gridView and add it to the gvItems control, while leaving the textbox fields empty. (pseudo-adding a new row).

It returns me the following error on the GVItems_RowCommand event: "{"A control with ID 'txtIMEI' could not be found for the trigger in UpdatePanel 'updateIMEI'."}"

Any help would be appreciated. Thanks (^_^)

Code:

    Protected Sub gvItemSearch_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles gvItemSearch.RowCommand
        Dim lbtnItem As LinkButton = CType(e.CommandSource, LinkButton)

        If lbtnItem.CommandName = "ItemSelect" Then
            Dim itemCode As String = OM.QStr(lbtnItem.Text)
            Dim i As Item = OM.getItem(itemCode)

            Dim dt As DataTable = CType(Session("gvItems"), DataTable)
            If dt Is Nothing Then
                dt = New DataTable

                dt.Columns.Add("ItemCode")
                dt.Columns.Add("Description")
                dt.Columns.Add("Quantity")
                dt.Columns.Add("Rate")
                dt.Columns.Add("Value")
                dt.Columns.Add("IMEI")
                dt.Columns.Add("chkIMEI")

                Dim dr As DataRow = dt.NewRow()
                dr.Item("ItemCode") = i.itemCode
                dr.Item("Description") = i.description
                dt.Rows.Add(dr)

                gvItems.DataSource = dt
                Session("gvItems") = dt
                gvItems.DataBind()
            Else
                Dim dr As DataRow = dt.NewRow()
                dr.Item("ItemCode") = i.itemCode
                dr.Item("Description") = i.description
                dt.Rows.Add(dr)

                gvItems.DataSource = dt
                Session("gvItems") = dt
                gvItems.DataBind()
            End If
        End If
    End Sub

<asp:UpdatePanel id="updateItems" runat="server">
                        <contenttemplate>
<asp:GridView id="gvItems" runat="server" >
<Columns>
<asp:TemplateField HeaderText="ITEM CODE"><ItemTemplate>
<asp:Label id="lblItemCode" runat="server" Text='<% Eval("ItemCode") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="DESCRIPTION"><ItemTemplate>
<asp:Label id="lblDescription" runat="server" Text=''<% Eval("Description") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="QUANTITY">
<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle>
<ItemTemplate>
                                <asp:TextBox ID="txtQuantity" runat="server"></asp:TextBox>

</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="RATE">
<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle>
<ItemTemplate>
                                <asp:TextBox ID="txtRate" runat="server"></asp:TextBox>

</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="VALUE">
<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle>
<ItemTemplate>
                                <asp:TextBox ID="txtValue" runat="server"></asp:TextBox>

</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="IMEI">
<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle>
<ItemTemplate>
<asp:UpdatePanel id="updateIMEI" runat="server" UpdateMode="Conditional" __designer:wfdid="w82"><ContentTemplate>
<asp:TextBox id="txtIMEI" runat="server" __designer:wfdid="w86" AutoPostBack="True"></asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="txtIMEI" EventName="TextChanged"></asp:AsyncPostBackTrigger>
</Triggers>
</asp:UpdatePanel>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField><ItemTemplate>
<asp:CheckBox id="chkIMEI" runat="server"></asp:CheckBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>

</asp:GridView>
</contenttemplate>
<triggers>
<asp:AsyncPostBackTrigger ControlID="gvItemSearch" EventName="RowCommand"></asp:AsyncPostBackTrigger>
</triggers>
</asp:UpdatePanel>

Masterpage with Updatepanel

obelix — Tue, 26 Feb 2008 05:00:00 GMT

I have a Maserpage and try with a Updatepanel to get the same result like with a frame.

How can I Update only the contentplaceholder without refresh the whole page?

Can anyone help my?

AsyncPostBackTrigger programmatically

kojoh — Sat, 07 Jul 2007 04:00:00 GMT

Hi.

As the Title How can I decalre AsyncPostBackTrigger to a button programmatically?

Regards.

AsyncPostBackTrigger

gmastro — Mon, 25 Jun 2007 04:00:00 GMT

hi,

i've a grdview1 whith select option that show in a 2nd grid its details. I put the 2nd grid in an UpdatePanel with

"<asp:AsyncPostBackTrigger ControlID="GridView1" EventName="SelectedIndexChanged" />"

Now the grid2 dispalys Async and paginate too.

The problem stay on Grid1 that don't refresh on paging neither on sort.

Someone knows why?

regard

How to show the progress panel during gridview's first load

uticket — Sat, 23 Jun 2007 04:00:00 GMT

I hope this is a simple question, but I just could not figure it out:

I have a gridview inside update panel and a update progress linked to the upgade panel. I can easily make the progress working after the gridview has been populated. For example, sort and move to next page.

However, when the page is loaded for the first time, I could not make the progress bar appear. Usually the first load is most time consuming.

Anyway, my quesiton is, how can I display the progress panel when the page is loaded for the first time. It seems the update progress only works when we are updating the update panel, but not loading the update panel. I tried trigger with no luck!

Your input will be appreciated.

Thanks!

Programmatically adding ASP.net User Control to UpdatePanel

ChrisCicc — Sat, 16 Jun 2007 04:00:00 GMT

Hi All, I got a real doozy here. I have read hundreds upon hundreds of forum posts and found numerous others who have replicated this problem, but have yet to find a solution. Through testing I have been able to find the cause of the problem, and will describe it here first textually and then through a code example.

The purpose of what I am trying to do is to create a postback-free web application through the use of ASP.net AJAX UpdatePanels and User Controls. When programmatically adding a User Control to a web page through a normal postback everything works fine. All the controls within the user control are registered properly in the page and any update panels included in the user control also work properly. HOWEVER, if instead of using a full postback you use an UpdatePanel and a partial page update of the UpdatePanel the controls do not get registered with the page and events from them do not fire (for instance, a button click event never hits the event breakpoint).

Because the very same user control works fine if loaded in a full postback or dynamically added from a namespace works fine, I can be relatively sure that it only is trouble when loading via a partial page update into an UpdatePanel. I load the control via the LoadConrol method and then add it to the page via a PlaceHolder control. Theoretically, adding the User Control to the PlaceHolder should register itself and it's controls and events with the page, but it does not.

The following code sample is a UpdatePanel-free page using a user control that works, later I will show the same code with an UpdatePanel that does not.

I think I need to figure out how to register the controls and their events with the page without going through a full page postback. Any suggestions??

This example works as expected:
Default.aspx:

1    <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
2    
3    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
4    <html xmlns="http://www.w3.org/1999/xhtml">
5    <head runat="server">
6        <title>Untitled Page</title>
7    </head>
8    <body>
9        <form id="form1" runat="server">
10           <div>
11               <asp:PlaceHolder ID="UCPlaceHolder" runat="server"></asp:PlaceHolder>
12           </div>
13       </form>    
14   </body>
15   </html>

Default.aspx.cs:

1    using System;
2    using System.Data;
3    using System.Configuration;
4    using System.Web;
5    using System.Web.Security;
6    using System.Web.UI;
7    using System.Web.UI.WebControls;
8    using System.Web.UI.WebControls.WebParts;
9    using System.Web.UI.HtmlControls;
10   
11   public partial class _Default : System.Web.UI.Page
12   {
13       protected void Page_Load(object sender, EventArgs e)
14       {
15           Control ctl = LoadControl("~/UserControlDemo.ascx");
16           ctl.ID = "UC1";
17           this.UCPlaceHolder.Controls.Add(ctl);
18       }
19   }

UserControlDemo.ascx:

1    <%@ Control Language="C#" AutoEventWireup="true" CodeFile="UserControlDemo.ascx.cs" Inherits="UserControlDemo" %>
2    <asp:Button ID="Button1" runat="server" Text="Display from UC" OnClick="Button1_Click" /> <br />
3    <br />
4    <asp:Label ID="Content" runat="server" Text="Content"></asp:Label>

UserControlDemo.ascx.cs:

1    using System;
2    using System.Data;
3    using System.Configuration;
4    using System.Collections;
5    using System.Web;
6    using System.Web.Security;
7    using System.Web.UI;
8    using System.Web.UI.WebControls;
9    using System.Web.UI.WebControls.WebParts;
10   using System.Web.UI.HtmlControls;
11   
12   public partial class UserControlDemo : System.Web.UI.UserControl
13   {
14       protected void Page_Load(object sender, EventArgs e)
15       {
16       }
17       protected void Button1_Click(object sender, EventArgs e)
18       {
19           Content.Text = "Content Changed.";
20       }
21   }

Now, consider this variation, where instead of loading the control in the PageLoad event, you do so programmatically via a button Click event. This does not work as it cause a full postback which refreshes the placeholder. Viewstate does not seem to be working in this case. (uses the same user control as the previous example)

Default.aspx:

1    <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
2    
3    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
4    <html xmlns="http://www.w3.org/1999/xhtml">
5    <head runat="server">
6        <title>Untitled Page</title>
7    </head>
8    <body>
9        <form id="form1" runat="server">
10           <div>
11               <asp:Button ID="Button1" runat="server" Text="Load User Control" OnClick="Button1_Click" /> 
12               <br />
13               <br />
14               <asp:PlaceHolder ID="UCPlaceHolder" runat="server"></asp:PlaceHolder>
15           </div>
16       </form>    
17   </body>
18   </html>

Default.aspx.cs:

1    using System;
2    using System.Data;
3    using System.Configuration;
4    using System.Web;
5    using System.Web.Security;
6    using System.Web.UI;
7    using System.Web.UI.WebControls;
8    using System.Web.UI.WebControls.WebParts;
9    using System.Web.UI.HtmlControls;
10   
11   public partial class _Default : System.Web.UI.Page
12   {
13       protected void Page_Load(object sender, EventArgs e)
14       {
15       }
16       protected void Button1_Click(object sender, EventArgs e)
17       {
18           Control ctl = LoadControl("~/UserControlDemo.ascx");
19           ctl.ID = "UC1";
20           this.UCPlaceHolder.Controls.Add(ctl);
21       }
22   }

To solve this postback problem, one would naturally want to use an UpdatePanel, like the following example. However this does not work as the controls do not seem to get registered with the page, and further nesting of user controls in UpdatePanels (to create a postback free app) are no better.

Default2.aspx:

1    <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
2    
3    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
4    
5    <html xmlns="http://www.w3.org/1999/xhtml" >
6    <head runat="server">
7        <title>Untitled Page</title>
8    </head>
9    <body>
10       <form id="form1" runat="server">
11       <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true"></asp:ScriptManager>
12       <div>
13           <asp:UpdatePanel ID="UpdatePanel2" runat="server">
14               <ContentTemplate>
15                   <asp:Button ID="Button1" runat="server" Text="Load User Control into UpdatePanel" OnClick="Button1_Click" />
16               </ContentTemplate>
17           </asp:UpdatePanel>
18           <br />
19           <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
20               <ContentTemplate>
21                   <asp:PlaceHolder ID="ContentPlaceHolder" runat="server"></asp:PlaceHolder>
22               </ContentTemplate>
23               <Triggers>
24                   <asp:AsyncPostBackTrigger ControlID="Button1" />
25               </Triggers>
26           </asp:UpdatePanel>
27       </div>
28       </form>
29   </body>
30   </html>

Default2.aspx.cs:

1    using System;
2    using System.Data;
3    using System.Configuration;
4    using System.Collections;
5    using System.Web;
6    using System.Web.Security;
7    using System.Web.UI;
8    using System.Web.UI.WebControls;
9    using System.Web.UI.WebControls.WebParts;
10   using System.Web.UI.HtmlControls;
11   
12   public partial class Default2 : System.Web.UI.Page
13   {
14       protected void Page_Load(object sender, EventArgs e)
15       {
16   
17       }
18       protected void Button1_Click(object sender, EventArgs e)
19       {
20           Control ctl = LoadControl("~/UserControlDemo.ascx");  //loads into the page
21           ctl.ID = "UC1";
22           this.ContentPlaceHolder.Controls.Add(ctl); //adds to page control tree (or at least it should)
23       }
24   }

I know I can use the "visible" property of my controls to toggle them on and off a page to create a flicker free experience, however, my application is a database intensive app and I don't want the page running queries against the database unless I'm absolutely sure the user wants them. Rendering a 10 forms and keeping them hidden isn't a big deal, but running 10 queries that the user never wants to see is, otherwise I'd stick to that method, its works perfectly. Any suggestions? Or requests for clarification? Any help you can provide is much appreciated...thanks, Chris.

How to show ProgressUpdate Control when CascadingDropDown is doing a callback.....

bookmark — Mon, 21 May 2007 04:00:00 GMT

I have two cascading dropdowns on one page. When user makes a choice on the first dropdown, the second will populate itself. Sometimes, It takes long time to populate the second dropdown. So I want the ProgressUpdate to show to the user. I already have a ProgressUpdate Control on the Master Page and it works just fine for the some other pages which has UpdatePanels.

But it doesn't work for the cascading dropdowns. I thought it will automatically shows up if it detects a callback on the page. Any ideas?

Thanks in advance.