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8.0

AsyncPostBack with Accordion,DataList and LinkButtons

Asked by ivita in Programming for ASP.NET, .NET Framework 2.x

Tags: ASP.NET 2.0, ASP.NET AJAX Toolkit 20229, .NET 2.0, C#

(Using Asp.net 2.0 and the Ajax control toolkit ver 20229)
(in a Content page)

I've setup an accordion with a parent/child category structure. The header of the Accordion contains a parent category and when the accordion pane extends, all the child categories for that parent are listed.

In order to get the parent categories in the header I placed a LinkButton in the Accordion's header template and then bound it to a SqlDataSource that selects the necessary values.

To get the child categories I've placed a DataList(of LinkButtons) in the Accordion's content template and then bind the DataList during the Accordion's ItemDataBound event.

I've been trying the get all the LinkButtons to peform an async. postback with an update panel that contains a gridview.

Since all the LinkButtons are created dynamically, I used the ToolkitScriptManager1.RegisterAsyncPostBackControl() method to try and register the LinkButtons.

Whenever a LinkButton is clicked, the DataList OnItemCommand Event handler fires. The Gridview DataSource is set and it's DataBind() method is called. Then I call the UpdatePanel.Update() method.  The UpdatePanel update mode is set to Conditional.

The Async. Postback happens once (when the page loads and I try a LinkButton) and then performs a regular Postback on subsequent requests.

Does anyone know why this happens?

Thanks. 
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<cc1:Accordion ID="Accordion1" runat="server"          
DataSourceID="SqlDataSource1" 
onitemdatabound="Accordion1_ItemDataBound" >
    <HeaderTemplate>
        <asp:LinkButton ID="LinkButton1" runat="server" Text='<%# Eval("parent_name") %>' CommandName="pc" CommandArgument='<%# Eval("pid") %>'></asp:LinkButton>
    </HeaderTemplate>
    <ContentTemplate>
        <asp:DataList ID="DataList1" runat="server" OnItemCommand="c_click">
            <ItemTemplate>
                <asp:LinkButton ID="LinkButton2" runat="server" Text='<%# Eval("child_name") %>' CommandName="cc" CommandArgument='<%# Eval("cid") %>'></asp:LinkButton>
            </ItemTemplate>
        </asp:DataList>
    </ContentTemplate>
</cc1:Accordion>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                    SelectCommand="getPCats" SelectCommandType="StoredProcedure" 
                    ConnectionString="myconnstring" 
                    ProviderName="myprovidername"></asp:SqlDataSource>
 
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
 .............................
<asp:UpdatePanel/>
 
 
protected void Accordion1_ItemDataBound(object sender, AccordionItemEventArgs e)
    {
 
        if (e.ItemType == AccordionItemType.Header)
        {
            // registers the Header LinkButtons as AsyncPostBackControls
            LinkButton lb = (LinkButton)e.AccordionItem.FindControl("LinkButton1");
            ToolkitScriptManager1.RegisterAsyncPostBackControl(lb);
        }
        
        if (e.ItemType == AccordionItemType.Content)
        {
 
 
            // populates the Content DataList based on the parent category
            DataRowView cv = (DataRowView)e.Item;
            int pc = int.Parse(cv.Row[0].ToString());
            DataList dl = (DataList)e.AccordionItem.FindControl("DataList1");
            try
            {
                dl.ItemDataBound += new DataListItemEventHandler(dl_ItemDataBound);
                dl.DataSource = getChildDataSource(pc);
                dl.DataBind();
            }
            catch (Exception ex)
            {
 
            }
        }
    }
 
    protected void dl_ItemDataBound(object sender, DataListItemEventArgs e)
    {
        // registers the DataList LinkButtons as AsyncPostBackControls
        LinkButton lb = (LinkButton)e.Item.FindControl("LinkButton2");
        ToolkitScriptManager1.RegisterAsyncPostBackControl(lb);
    }
 
    protected void c_click(object sender, CommandEventArgs e)
    {
        if (e.CommandName == "pc")
        {
            // binds the gridview to the data source for the parent category
            gvDataSource = getPCGVDataSource();
            gvDataSource.DataBind();
        }
        else if (e.CommandName == "cc")
        {
            // binds teh gridview to the datasource for the child category
            gvDataSource = getCCGVDataSource();
            gvDataSource.DataBind();
 
        }
 
        UpdatePanel1.Update();
    }
 
Keywords: AsyncPostBack with Accordion,Data…
Title
1 How do I add AsyncPostbacks to Acc…
 
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[+][-]08/05/09 02:21 AM, ID: 25021401

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[+][-]08/06/09 07:36 AM, ID: 25033869

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About this solution

Zones: Programming for ASP.NET, .NET Framework 2.x
Tags: ASP.NET 2.0, ASP.NET AJAX Toolkit 20229, .NET 2.0, C#
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Solution Provided By: ivita
Participating Experts: 1
Solution Grade: A
 
 
 
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