RadTreeList - Pagging Issue

[Paul]

Hello Telerik Team,

  We have a problem using TreeListView. Because there are a lot of records as result, we need to use paging in db. First page is displayed ok, but when another page is selected, this error is thrown: “the table must contain row sections in order of header, body, then footer”. VirtualCount is not supported for this control.

 

  See below the definition of the treelist:

 

        <telerik:RadTreeList ID="rtlDescendants" runat="server" ShowTreeLines="true" ShowOuterBorders="true"

            ParentDataKeyNames="ParentInstanceID" DataKeyNames="InstanceID" AutoGenerateColumns="false"

            Skin="Office2007" OnNeedDataSource="rtlDescendants_NeedDataSource" OnItemDataBound="rtl_ItemDataBound"

            AllowPaging="true" AllowSorting="false" PageSize="10" onpageindexchanged="rtlDescendants_PageIndexChanged">

            <PagerStyle Position="Bottom" Mode="NextPrevAndNumeric" />

            <Columns>

                <telerik:TreeListTemplateColumn HeaderText="ID">

                    <ItemTemplate>

                        <asp:Image ID="imgDomain" Width="16px" Height="16px" ImageUrl='<%# String.Format("~/images/Metallic16x16/{0}16x16.png", Eval("DomainName").ToString().ToUpper()) %>'

                            runat="server" />&nbsp;

                        <asp:LinkButton ID="lnkName" runat="server" CausesValidation="false" Text='<%# Eval("Name")%>'

                            PostBackUrl='<%# String.Format("~/CI/Attributes.aspx?InstanceID={0}", Eval("InstanceID")) %>'></asp:LinkButton>

                    </ItemTemplate>

                </telerik:TreeListTemplateColumn>

                <telerik:TreeListTemplateColumn HeaderStyle-Width="3%" ItemStyle-Width="3%" ItemStyle-HorizontalAlign="Center">

                    <ItemTemplate>

                        <asp:ImageButton ID="imgbPreview" runat="server" CausesValidation="false" OnClientClick='<%# String.Format("OpenPreviewPanel({0})", Eval("InstanceID")) %>'

                            ImageUrl="~/imagesCMSite/folder-explorer-icon.png" CssClass="image" />

                    </ItemTemplate>

                </telerik:TreeListTemplateColumn>

                <telerik:TreeListBoundColumn HeaderText="Type" HeaderStyle-Width="27%" ItemStyle-Width="27%"

                    DataField="DomainName" UniqueName="DomainName">

                </telerik:TreeListBoundColumn>

                <telerik:TreeListBoundColumn HeaderText="Modified By" HeaderStyle-Width="20%" ItemStyle-Width="20%"

                    DataField="ModifiedBy" UniqueName="ModifiedBy">

                </telerik:TreeListBoundColumn>

                <telerik:TreeListBoundColumn HeaderText="Last Modified" HeaderStyle-Width="20%" ItemStyle-Width="20%"

                    DataField="LastModified" UniqueName="LastModified">

                </telerik:TreeListBoundColumn>

            </Columns>

        </telerik:RadTreeList>

In addition, next pages can include children nodes but their parent could be "located" in previous page

Thank you in advance for your help

[Veli]

Hi Paul,

RadTreeList does not currently support custom paging. You need to provide the entire treelist data source, so that it can properly build its hierarchical items tree. Otherwise, the control cannot track its expanded items state.

Veli
the Telerik team