Multiple Targets for Extenders?????

hi

is there any possibility for using a single extender for multiple targetcontrol ids?

for eg..

if u have 10 textboxes and we wan to addfilteredtextboxextender to all the textboxes,can use singlefilteredtextboxextender for all 10 textboxes?

Thanks in advance

Hi,

no, in beta1 an extender must target one server control.

whether it ll affect the performance when using large number of extenders in a single page

Multiple updatepanels vs single updatepanel

Hi,

Anybody got any information regarding the trade off with having either a single updatepanel encapsulating a large number of databound controls (each of which can be independently updated) or multiple updatepanels each surrounding a single databound control?

Any advice or pointers would much appreciated.

Brendy

The answer depends on what gets updated and the dependency that the controls have on each other. Typically, you want to use UpdatePanels to only update fragments of the page that need to be updated, leaving the other areas intact. This technique will also reduce the amount of data that is coming back down from the server to render the page.

So if some controls don't need to be updated regularly, then they belong within their own UpdatePanel (with the UpdateMode set to Conditional).

hi, many thanks for your reply. What I really want to know is, is there a point at which adding more updatepanels to a page starts to have a negative impact on performance? The page that I have has a 10x10 matrix with each cell containing a number of independent datadriven controls. So what's the tradeoff between having one update panel covering the entire matrix or 100 updatepanels one for each cell? Does this slow down the page load?

Cheers

Brendy

Multiple UpdatePanels updated by single trigger -- bug or feature?

Hi, not sure if this has been discussed before but..

I'm running April CTP, and I have two UpdatePanels on my page. UpdatePanel1 includes a navbar with various LinkButtons, and the other UpdatePanel2 contains a GridView. I've added a ControlEventTrigger to UpdatePanel2 for the click event of the LinkButtons in UpdatePanel1. UpdatePanel1 has no triggers (I plan on adding triggers at a later time). The issue is, when I click a LinkButton from UpdatePanel1, it updates both UpdatePanels! I would like it to only update UpdatePanel2 as I thought it should, but maybe I am just not understanding the way UpdatePanels work.

I'm thinking the fact that UpdatePanel2 is using a Control Event from UpdatePanel1, this might be the cause of these problems. When I moved the LinkButtons out of UpdatePanel2, UpdatePanel1 was no longer updated. I've included the source code for the two UpdatePanels:

<atlas:UpdatePanel runat="server" ID="UpdatePanel1" Mode="Conditional"> <ContentTemplate> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td><asp:LinkButton CssClass="navlink_selected" ID="homeLinkT" runat="server" OnClick="link_Click" CommandName="home" CommandArgument="1" >home</asp:LinkButton> <asp:LinkButton CssClass="navlink_unselected" ID="aboutLinkT" runat="server" OnClick="link_Click" CommandName="about" CommandArgument="2" >about</asp:LinkButton> <asp:LinkButton CssClass="navlink_unselected" ID="resumeLinkT" runat="server" OnClick="link_Click" CommandName="resume" CommandArgument="3" >resume</asp:LinkButton> <asp:LinkButton CssClass="navlink_unselected" ID="projectsLinkT" runat="server" OnClick="link_Click" CommandName="projects" CommandArgument="4" >projects</asp:LinkButton> <asp:LinkButton CssClass="navlink_unselected" ID="forumLinkT" runat="server" OnClick="link_Click" CommandName="forum" CommandArgument="5" >forum</asp:LinkButton> <asp:LinkButton CssClass="navlink_unselected" ID="contactLinkT" runat="server" OnClick="link_Click" CommandName="contact" CommandArgument="6" >contact</asp:LinkButton> </td> <td style="width:80px"> <atlas:UpdateProgress ID="up1" runat="server"> <ProgressTemplate> <asp:Image ID="Image2" runat="server" ImageUrl="~/images/Hourglass_iconsm.gif"/> </ProgressTemplate> </atlas:UpdateProgress> </td> </tr> </table> </ContentTemplate> </atlas:UpdatePanel> <atlas:UpdatePanel runat="server" ID="UpdatePanel2" Mode="Conditional"> <ContentTemplate> <asp:HiddenField ID="page_id" runat="server" Value="1" /> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="page_id" DataSourceID="ObjectDataSource1" ShowHeader="False" GridLines="None" AutoGenerateEditButton="false" > <Columns> <asp:TemplateField> <EditItemTemplate> <asp:TextBox ID="TextBox1" runat="server" Height="100%" Text='<%# Bind("page_content")%>' TextMode="MultiLine" Width="600px" Rows="10"></asp:TextBox> </EditItemTemplate> <ItemTemplate> <asp:Label ID="Label1" runat="server" Text='<%# Eval("page_content")%>'></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:BoundField DataField="page_id" HeaderText="page_id" ReadOnly="True" SortExpression="page_id" Visible="False" /> </Columns> </asp:GridView> </ContentTemplate> <Triggers> <atlas:ControlEventTrigger ControlID="homeLinkT" EventName="Click" /> <atlas:ControlEventTrigger ControlID="aboutLinkT" EventName="Click" /> <atlas:ControlEventTrigger ControlID="resumeLinkT" EventName="Click" /> <atlas:ControlEventTrigger ControlID="projectsLinkT" EventName="Click" /> <atlas:ControlEventTrigger ControlID="forumLinkT" EventName="Click" /> <atlas:ControlEventTrigger ControlID="contactLinkT" EventName="Click" /> </Triggers> </atlas:UpdatePanel>

Anyone have any ideas?

Thanks,

Matt

This is not a bug, but the intended result.

Clicking a server control that causes a postback (i.e. a link button or a normal button) when that server control is contained within the ContentTemplate of an UpdatePanel will cause that UpdatePanel to update even if it is not explicitly defined as a trigger. UpdatePanel1 is updating for this reason and UpdatePanel2 is updating because the control is defined as a triggering event.

Ah, thanks for the clarification Joel!

Matt

So is there a way for getting around this? If I have a menu of links and I want some to be loaded into one updatepanel and some into another. Is this even do-able?

Thanks.