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Sorting on GridImageColumn

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Mike Kacos
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Mike Kacos asked on 06 May 2010, 03:58 PM
Hi,
    I have a grid, that has a GridImageColumn.  The imageUrl is working correctly, and on ItemDataBound I Clear the image out from some rows, so I am left with a grid that has some rows with an image and some without in the same column.  My question is simply, is there a way to sort on that column??  I tried adding an invisible GridBoundColumn which I would populate with either a "1" or a "0" and set my sort expression to that column and set AllowSorting to true, but when I click on the column header I receive an error that says Cannot find column, so I think that's the wrong approach.  See code below.

Any help will be greatly appreciated.

Thanks,

-Mike

 <ngc:NGCGrid ID="grdItems" runat="server" AllowPaging="True" AllowSorting="True" 
        AllowMultiRowSelection="True" GridLines="None" AutoGenerateColumns="False" PageSize="500" 
        OnNeedDataSource="grdItems_NeedSource" EnableViewState="true" AllowAutomaticDeletes="true" 
        OnItemCommand="grdItems_ItemCommand" OnItemDataBound="grdItems_ItemDataBound" 
        OnItemCreated="grdItems_ItemCreated" OnItemUpdated="grdItems_ItemUpdated" OnItemInserted="grdItems_ItemInserted" 
        OnItemDeleted="grdItems_ItemDeleted">  
        <ClientSettings AllowKeyboardNavigation="True" > 
            <Scrolling AllowScroll="true" ScrollHeight="440px" UseStaticHeaders="true" /> 
            <Selecting AllowRowSelect="true" /> 
        </ClientSettings> 
        <MasterTableView CommandItemDisplay="Top" CommandItemSettings-AddNewRecordText="Add Item" 
            EditMode="InPlace" DataKeyNames="ITEM_ID">  
            <CommandItemTemplate > 
                <div style="padding: 5px 5px;">  
 
                 <asp:LinkButton ID="LinkButton2" runat="server" CommandName="InitInsert" > 
                 <img style="border:0px;vertical-align:middle;" alt="" src="../../App_Themes/SpidersTheme/Grid/AddRecord.gif" />Add new Item  
                 </asp:LinkButton>&nbsp;&nbsp;  
 
                <asp:LinkButton ID="LinkButton1" OnClientClick="javascript:return confirm('Are you sure you want to delete all selected Items?')" 
                    runat="server" CommandName="DeleteSelected">  
                    <img style="border:0px;vertical-align:middle;" alt="" src="../../App_Themes/SpidersTheme/Grid/Delete.gif" />Delete selected Items</asp:LinkButton>&nbsp;&nbsp;  
                </div> 
            </CommandItemTemplate> 
            <Columns> 
                <telerik:GridClientSelectColumn> 
                    <HeaderStyle Width="10px" /> 
                    <ItemStyle Width="10px" /> 
                </telerik:GridClientSelectColumn> 
                <telerik:GridEditCommandColumn ButtonType="ImageButton">  
                    <HeaderStyle Width="35px" /> 
                    <ItemStyle Width="35px" /> 
                </telerik:GridEditCommandColumn> 
                <telerik:GridButtonColumn Text="Delete" CommandName="Delete" ButtonType="ImageButton" 
                    ConfirmText="Are you sure you want to delete this item?">  
                    <HeaderStyle Width="10px" /> 
                    <ItemStyle Width="10px" /> 
                </telerik:GridButtonColumn> 
                <telerik:GridImageColumn UniqueName="FilteredFlag" ImageUrl="../../Common/Images/green_flag_16x16.png" AllowSorting="true"   
                HeaderImageUrl="../../Common/Images/green_flag_16x16.png" SortExpression="FilterFlagOrder"  > 
                <HeaderStyle Width="10px" /> 
                    <ItemStyle Width="10px" /> 
                      
                </telerik:GridImageColumn> 
                <telerik:GridBoundColumn UniqueName="FilterFlagOrder" Visible="true">  
                </telerik:GridBoundColumn> 
                <telerik:GridBoundColumn DataField="NSN" HeaderText="NSN" UniqueName="NSN" ColumnEditorID="GridTextBoxColumnEditor1" > 
                    <HeaderStyle Width="120px" /> 
                    <ItemStyle Width="120px" /> 
                </telerik:GridBoundColumn> 
                <telerik:GridBoundColumn DataField="ITEM_DESCRIPTION" HeaderText="Description" UniqueName="ITEM_DESCRIPTION" 
                    ColumnEditorID="GridTextBoxColumnEditor2">  
                    <HeaderStyle Width="300px" /> 
                    <ItemStyle Width="300px" /> 
                </telerik:GridBoundColumn> 
                <telerik:GridNumericColumn DataField="USAGE_FACTOR" HeaderText="Factor" UniqueName="USAGE_FACTOR" 
                    ColumnEditorID="GridNumericColumnEditor1">  
                    <HeaderStyle Width="40px" /> 
                    <ItemStyle Width="40px" /> 
                </telerik:GridNumericColumn> 
                <telerik:GridHyperLinkColumn Text="Search">  
                      
                </telerik:GridHyperLinkColumn> 
                  
            </Columns> 
        </MasterTableView> 
    </ngc:NGCGrid> 
    <telerik:GridTextBoxColumnEditor ID="GridTextBoxColumnEditor1" runat="server" TextBoxStyle-Width="120px" /> 
    <telerik:GridTextBoxColumnEditor ID="GridTextBoxColumnEditor2" runat="server" TextBoxStyle-Width="300px" /> 
    <telerik:GridNumericColumnEditor ID="GridNumericColumnEditor1" runat="server" NumericTextBox-Width="40px" /> 

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Pavlina
Telerik team
answered on 06 May 2010, 04:05 PM
Hello Mike,

Please refer to the forum thread below which elaborates on this matter, for more information about how to achieve the desired functionality.
http://www.telerik.com/community/forums/aspnet-ajax/grid/radgrid-image-column-not-updating-when-sorting.aspx

I hope this helps.

Kind regards,
Pavlina
the Telerik team

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Mike Kacos
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answered on 06 May 2010, 04:15 PM
Hi, thanks, but I already went through that thread.  Maybe I'm missing something, but it sounds like that users's issue was updating images on sorting.  I'm just trying to get the sort to happen.  I don't need to update the images, just simply sort on the Image Column.
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Pavlina
Telerik team
answered on 07 May 2010, 09:27 AM
Hi Mike,

Please examine the online example below where the GridImageColumn is sorted as expected and see if it helps to resolve the issue you are facing:
http://demos.telerik.com/aspnet-ajax/grid/examples/generalfeatures/columntypes/defaultcs.aspx

If the problem persists at your end, you can open a formal support ticket and send me a small working project, demonstrating your setup, and showing the issue. I will review it locally, and get back to you with more information on the matter.

Regards,
Pavlina
the Telerik team

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Mike Kacos
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Pavlina
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Mike Kacos
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