Sorting not working

[Iker Llanos]

I'm trying to sort a ListView but no way. I will explain what I've done:

- I get a List of products that containt an Order field (Orden integer)
- I put this datasource to the listview and databind()
- In the ascx I have this code:

<asp:Panel ID="listViewPanelProductos" CssClass="ListViewList" runat="server">
    <telerik:RadListView ID="lvProductos" runat="server" AllowPaging="true"
         EnableViewState="true" OnItemDataBound="lvProductos_ItemDataBound"
    ItemPlaceholderID="ProductosContainer" DataKeyNames="IdProducto">
<SortExpressions>
            <telerik:RadListViewSortExpression FieldName="Orden" SortOrder="Ascending" />
        </SortExpressions>
        <LayoutTemplate>
            <fieldset id="fieldSet" class="fieldSet">
                <asp:PlaceHolder ID="ProductosContainer" runat="server" />
                <div style="clear:both"></div>
                <table cellpadding="0" cellspacing="0" style="margin:auto; padding-top:15px;">
                    <tr>
                        <td>
                            <telerik:RadDataPager ID="pager" runat="server" PagedControlID="lvProductos" PageSize="10" Skin="Default" AllowSEOPaging="true" SEOPagingQueryPageKey="pag">
                                <Fields>
                                    <telerik:RadDataPagerButtonField FieldType="Prev" />
                                    <telerik:RadDataPagerButtonField FieldType="Numeric" />
                                    <telerik:RadDataPagerButtonField FieldType="Next" />
                                </Fields>
                            </telerik:RadDataPager>
                        </td>
                    </tr>
                </table>
            </fieldset>
        </LayoutTemplate>
        <ItemTemplate>
            <div class="item">
                <div class="tituloProducto">
                    <h2>
                        <asp:HyperLink ID="lnkTitulo" Text='<%# Eval("Titulo") %>' ToolTip='<%# Eval("Titulo") %>'
                            runat="server" EnableViewState="false" />
                    </h2>
                </div>
                <div class="descripcionProducto">
                    <asp:Label ID="lblDescripcion" runat="server" EnableViewState="false"></asp:Label>
                </div>
            </div>
        </ItemTemplate>
.
.
.
.
.

- No sorting happens.

What am I doing wrong?

Thanks

[Pavlina]

Hello Iker,

The correct approach when using simple data-binding is to call the DataBind() method on the first page load when !Page.IsPostBack and after handling some event (sort event for example). Keep in mind that if you choose simple data-binding, you will need to assign data-source and rebind the grid after each operation (paging, sorting, editing, etc.) - this copies exactly MS ListView behavior.

You can also review the corresponding online demo of the product which illustrates direct comparison between the simple and advanced binding of RadListView.

I hope this helps.

All the best,
Pavlina
the Telerik team

[Iker Llanos]

I'm trying this with an entity datasource and it doesn't work either:

<asp:Panel ID="listViewPanelProductos" CssClass="ListViewList" runat="server">
    <telerik:RadListView ID="lvProductos" runat="server" AllowPaging="true"
         EnableViewState="true" OnItemDataBound="lvProductos_ItemDataBound"
    ItemPlaceholderID="ProductosContainer" DataKeyNames="IdProducto" DataSourceID="dsProductos">
            <fieldset id="fieldSet" class="fieldSet">
                <asp:PlaceHolder ID="ProductosContainer" runat="server" />
                <div style="clear:both"></div>
                <table cellpadding="0" cellspacing="0" style="margin:auto; padding-top:15px;">
                    <tr>
                        <td>
                            <telerik:RadDataPager ID="pager" runat="server" PagedControlID="lvProductos" PageSize="10" Skin="Default" AllowSEOPaging="true" SEOPagingQueryPageKey="pag">
                                <Fields>
                                    <telerik:RadDataPagerButtonField FieldType="Prev" />
                                    <telerik:RadDataPagerButtonField FieldType="Numeric" />
                                    <telerik:RadDataPagerButtonField FieldType="Next" />
                                </Fields>
                            </telerik:RadDataPager>
                        </td>
                    </tr>
                </table>
            </fieldset>
        </LayoutTemplate>
        <ItemTemplate>
            <div class="item">
                <div class="tituloProducto">
                    <h2>
                        <asp:HyperLink ID="lnkTitulo" Text='<%# Eval("Titulo") %>' ToolTip='<%# Eval("Titulo") %>'
                            runat="server" EnableViewState="false" />
                    </h2>
                </div>
                <div class="descripcionProducto">
                    <asp:Label ID="lblDescripcion" runat="server" EnableViewState="false"></asp:Label>
                </div>
            </div>
        </ItemTemplate>

<asp:EntityDataSource ID="dsProductos" runat="server"
    ConnectionString="name=Entities"
    DefaultContainerName="Entities" EntitySetName="productos"
    OrderBy="it.Orden ASC">
</asp:EntityDataSource>

[Pavlina]

Hi Iker,

To enable sorting functionality for the RadListView  you should add a SortExpression object to the SortExpressions collection as demonstrated in the following help article:
http://www.telerik.com/help/aspnet-ajax/listview-sorting.html

Additionally, note that when Sort/Page commands are triggered RadListView requires to re-bind in order to process the command.
You can find list of commands the call rebind implicitly on the article bellow:
http://www.telerik.com/help/aspnet-ajax/listview-commands-invoking-rebind-implicitly.html

Greetings,
Pavlina
the Telerik team

[JM]

It's probably a bug.. Try setting AllowPaging to  false.

[Pavlina]

Hi,

To fix the problem with sorting, you will need to upgrade to the latest version of RadControls for ASP.NET AJAX:
http://www.telerik.com/support/kb/aspnet-ajax/general/updating-radcontrols-for-asp-net-to-another-version-or-license.aspx

Best wishes,
Pavlina
the Telerik team