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Column sorting without using the gridview's _doPostBack javascript

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wink asked on 10 Dec 2009, 10:16 PM

I have a page that displays several filters grouped in categories which users can select via expand/collapse feature using javascript. After selecting the filters, users need to click on a Submit button to see results which are then displayed on the same page in a gridview. The gridview is nested within a panel with visible="true". The user needs to be able to sort the column headings in the gridview. However, if gridview's SortExpression is used, and I click on the column heading, the gridview is not visible anymore. I need to click on the Submit button again in order to see the sorted gridview. When I do a hard refresh, the gridview is still visible, but when I click on the column heading which runs a _doPostBack javascript, the gridview is not visible. Is there any way to enable column sorting without using the gridview's _doPostBack javascript?

The paging feature is not being used. I've tried to force the page to display the gridview on page_load, but it just doesn't display. The gridview's visible property is set to true by default.

Any advice and suggestions would be appreciated. A snippet of my code is pasted below just in case.

Thanks!

On front-end:

    
            <asp:ImageButton ID="btnSubmit" runat="server" src="images/btn_submit.gif" />  
        
            <asp:panel ID="panResults" runat="server" Visible="true">  
        
                <asp:GridView ID="gvInventory" runat="server" Width="100%" CssClass="padded" AllowSorting="true" AllowPaging="False" DataSourceID="dsSearchInventory" AutoGenerateColumns="false" Visible="true">  
        
                <Columns>  
        
                    <asp:TemplateField HeaderText="Reference<br>No." ItemStyle-HorizontalAlign="Center" ItemStyle-VerticalAlign="Top" SortExpression="RefNum">  
        
                        <ItemTemplate>  
        
                             <asp:Label ID="lblRefNum" runat="server" Text='<%# Eval("RefNum") %>'></asp:Label>  
        
                        </ItemTemplate>  
        
                    </asp:TemplateField>      
        
                </Columns>  
        
            </asp:GridView>  
        
            <asp:SqlDataSource ID="dsSearchInventory" runat="server" ConnectionString="<%$ ConnectionStrings:dbConn %>" ProviderName="<%$ ConnectionStrings:dbConn.ProviderName %>" SelectCommand="">  
        
            </asp:SqlDataSource>  
        
            </asp:panel>

On code-behind:

    
            Protected Sub Page_Load(ByVal sender As System.Object, ByVal E As System.EventArgs) Handles MyBase.Load  
        
                    If Page.IsPostBack Then 
        
                        panResults.Visible = True 
        
                    End If 
        
            End Sub 
        
            Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles btnSubmit.Click  
        
                'Executes dynamic SQL query string  
        
            End Sub