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Update Panel with a Datagrid populated PageLoad

Posted on 2008-10-01
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Last Modified: 2012-05-05
I have a datagrid in a report that is populated at the PageLoad event from parameters passed in the query string.

I would like to put this datagrid in an update panel so that I can display the UpdateProgress while the data is being fetched and then display the results. I can't get the page to render and display the information until it has fetched the data - I have tried (see code snippet) but to no avail.
<asp:ScriptManager ID="ScriptManager" runat="server"></asp:ScriptManager>

    <div id="reportPadding" runat="server" class="reportPagePadding">

    <asp:UpdatePanel ID="ReportPanel" runat="server" >

    <ContentTemplate>

    <div id="divCenter" class="center" runat="server">

        <table id="headerTable" width="100%">

            <tr>

                <asp:Literal ID="AllTestHistoryReportHeader" runat="server"></asp:Literal></tr>

        </table>

        <asp:Literal ID="message" runat="server"></asp:Literal>

        <asp:DataGrid ID="allHistoryData" runat="server" DataKeyField="LearningObjectID"

            AutoGenerateColumns="false" OnItemDataBound="allHistory_ItemDataBound">

            <HeaderStyle Font-Bold="true" HorizontalAlign="Center" />

            <Columns>

                <asp:BoundColumn DataField="TestNumber" HeaderStyle-Width="150" ItemStyle-Width="150"

                    HeaderText="Test Number"></asp:BoundColumn>

                <asp:BoundColumn DataField="Description" HeaderStyle-Width="200" ItemStyle-Width="200"

                    HeaderText="Description" />

                <asp:TemplateColumn HeaderStyle-Width="240" ItemStyle-Width="240" HeaderText="Test Name">

                    <ItemTemplate>

                        <asp:Label ID="lblTestName" runat="server" /></ItemTemplate>

                </asp:TemplateColumn>

                <asp:BoundColumn DataField="Date" DataFormatString="{0:d}" HeaderStyle-Width="100"

                    ItemStyle-Width="100" HeaderText="Date" />

                <asp:BoundColumn DataField="Score" DataFormatString="{0:F0}" HeaderStyle-Width="150"

                    ItemStyle-Width="150" HeaderText="Score  (%)" />

                <asp:BoundColumn DataField="TestStatus" HeaderStyle-Width="150" ItemStyle-Width="150"

                    HeaderText="Test Status" />

                <asp:BoundColumn DataField="Action" HeaderStyle-Width="100" ItemStyle-Width="100"

                    HeaderText="Action" />

            </Columns>

        </asp:DataGrid>

    </div>

       </ContentTemplate>

       </asp:UpdatePanel>

    <asp:UpdateProgress ID="UpdateProgress" runat="server" AssociatedUpdatePanelID="ReportPanel">

    <ProgressTemplate>

    In Progress.....

    </ProgressTemplate>

    </asp:UpdateProgress>

    </div>

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Question by:SimonFerris
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Expert Comment

by:informaniac
ID: 22612438
There is no trigger defined to cause an asynchronous postback...

The update progress will be displayed only in case an asynchronous postback is occuring....

For an example have a look here...

http://www.asp.net/learn/3.5-videos/video-362.aspx

In this example the gridview is populated according to the selection in the dropdownlist

Hope this helps...
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Author Comment

by:SimonFerris
ID: 22612702
I have other pages(reports) where there are dropdownlists to specify filters - so thanks for the pointer to the video. In this case the user does not make a choice on the page but has clicked a link on another page that passes the parameter in the query string and the data is fetched.
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Accepted Solution

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informaniac earned 250 total points
ID: 22612898
That won't be possible I think...

Because the concept of ajax is that it performs partial updates to the page.

Here u r not perform a update to the page. u r loading it in the first place.

So u'll have to do some workaround...

U could place a lable above the gridview

label1.Text = "Fetching data...";

gv.Datasource=......;
gv.DataBind();
label1.Text=string.Empty;

Hope this helps
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Author Comment

by:SimonFerris
ID: 22613468
Cheers for that I'll give it a go.
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Author Closing Comment

by:SimonFerris
ID: 31501873
Thanks for the quick response. I didn't see any examples out there of how to do this initially and you've helped confirm the way to go.
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