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Version Q2 2011 released 07/12/2011
select

TreeList / Server-side Selection

Configurator
Multi row selection 		Single row selection
SportIDSport
1Winter
2Summer
SportIDSport  
1Winter
2Summer
Selected items:
Selected item:

  • The purpose of this example is to demonstrate the server-side selection capabilities of the RadTreeList control. The server-sede selection could be achieved by using the build in TreeListSelectColumn:

    <Columns>
    <telerik:TreeListSelectColumn></telerik:TreeListSelectColumn>
    </Columns>

    The alternative way is to fire the Select / Deselect commands as shown in the second (Single row selection) demo.

    Additionally, using the demo Configurator for the first RadTreeList control, you can see how the recursive selection works.
    Note that when recursive selection is enabled, the RadTreeList items are selected server-side (with postback) and multi-row selection is enabled implicitly.

Source Code

C# VB.NET
Show code in new window Demo isolation steps
  • <%@ Page Language="VB" AutoEventWireup="false" Inherits="Telerik.TreeListExamplesVBNET.Selecting.ServerSideSelection.DefaultVB"
        CodeFile="DefaultVB.aspx.vb" %>

    <%@ Register TagPrefix="telerik" Namespace="Telerik.QuickStart" %>
    <%@ Register TagPrefix="telerik" TagName="Header" Src="~/Common/Header.ascx" %>
    <%@ Register TagPrefix="telerik" TagName="HeadTag" Src="~/Common/HeadTag.ascx" %>
    <%@ Register TagPrefix="telerik" TagName="Footer" Src="~/Common/Footer.ascx" %>
    <%@ Register TagPrefix="qsf" Namespace="Telerik.QuickStart" %>
    <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/tr/xhtml11/DTD/xhtml11.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
        <telerik:HeadTag runat="server" ID="Headtag2"></telerik:HeadTag>
        <style type="text/css">
            .RadTreeList .rtlTable td, .RadTreeList .rtlTable th
            {
                line-height: 1.3;
            }
            .siFieldset
            {
                width: 410px;
                padding: 10px;
            }
        </style>
    </head>
    <body class="BODY">
        <form runat="server" id="mainForm" method="post">
        <telerik:Header runat="server" ID="Header1" NavigationLanguage="VB" />
        <!-- content start -->
        <telerik:RadScriptManager ID="RadScriptManager1" runat="server" />
        <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" />
        <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
            <AjaxSettings>
                <telerik:AjaxSetting AjaxControlID="RadTreeList1">
                    <UpdatedControls>
                        <telerik:AjaxUpdatedControl ControlID="RadTreeList1" LoadingPanelID="RadAjaxLoadingPanel1" />
                        <telerik:AjaxUpdatedControl ControlID="SelectedItemsLabel" />
                    </UpdatedControls>
                </telerik:AjaxSetting>
                <telerik:AjaxSetting AjaxControlID="RadTreeList2">
                    <UpdatedControls>
                        <telerik:AjaxUpdatedControl ControlID="RadTreeList2" LoadingPanelID="RadAjaxLoadingPanel1" />
                        <telerik:AjaxUpdatedControl ControlID="SelectedItemLabel" />
                    </UpdatedControls>
                </telerik:AjaxSetting>
                <telerik:AjaxSetting AjaxControlID="CheckBox1">
                    <UpdatedControls>
                        <telerik:AjaxUpdatedControl ControlID="RadTreeList1" LoadingPanelID="RadAjaxLoadingPanel1" />
                        <telerik:AjaxUpdatedControl ControlID="SelectedItemsLabel" />
                    </UpdatedControls>
                </telerik:AjaxSetting>
            </AjaxSettings>
        </telerik:RadAjaxManager>
        <table>
            <thead>
                <tr>
                    <th>
                        <qsf:ConfiguratorPanel runat="server" ID="ConfigurationPanel1" Title="Configurator">
                            <table>
                                <tr>
                                    <td>
    <asp:CheckBox OnCheckedChanged="CheckBox1_CheckedChanged" runat="server" ID="CheckBox1"
    AutoPostBack="true" Text="Allow Recursive Selection (Used in multi row selection example) " />
                                    </td>
                                </tr>
                            </table>
                        </qsf:ConfiguratorPanel>
                        Multi row selection
                    </th>
                    <th>
                        Single row selection
                    </th>
                </tr>
            </thead>
            <tbody>
                <tr valign="top">
                    <td>
                        <telerik:RadTreeList ID="RadTreeList1" runat="server" Width="430px" OnNeedDataSource="RadTreeList1_NeedDataSource"
                            DataKeyNames="ID" ParentDataKeyNames="TypeID" AutoGenerateColumns="false" AllowMultiItemSelection="true">
                            <Columns>
                                <telerik:TreeListSelectColumn HeaderStyle-Width="38px">
                                </telerik:TreeListSelectColumn>
                                <telerik:TreeListBoundColumn DataField="ID" HeaderText="SportID" HeaderStyle-Width="80px" UniqueName="ID" />
                                <telerik:TreeListBoundColumn DataField="Name" HeaderText="Sport" UniqueName="Name" />
                            </Columns>
                        </telerik:RadTreeList>
                    </td>
                    <td>
                        <telerik:RadTreeList ID="RadTreeList2" runat="server" Width="430px" OnNeedDataSource="RadTreeList1_NeedDataSource"
                            DataKeyNames="ID" ParentDataKeyNames="TypeID" AutoGenerateColumns="false">
                            <ItemStyle VerticalAlign="Middle" />
                            <Columns>
                                <telerik:TreeListBoundColumn DataField="ID" HeaderText="SportID" UniqueName="ID" />
                                <telerik:TreeListBoundColumn DataField="Name" HeaderText="Sport" UniqueName="Name" />
                                <telerik:TreeListTemplateColumn HeaderStyle-Width="80px">
                                    <HeaderTemplate>
                                        &nbsp;
                                    </HeaderTemplate>
                                    <ItemTemplate>
                                        <telerik:RadButton ID="SelectButton" runat="server" Text="+" CommandName="Select"
                                            Width="24px" />
                                        <telerik:RadButton ID="DeselectButton" runat="server" Text="-" CommandName="Deselect"
                                            Width="24px" />
                                    </ItemTemplate>
                                </telerik:TreeListTemplateColumn>
                            </Columns>
                        </telerik:RadTreeList>
                    </td>
                </tr>
                <tr>
                    <td>
                        Selected items:
                        <fieldset class="siFieldset">
                            <asp:Label ID="SelectedItemsLabel" runat="server" />
                        </fieldset>
                    </td>
                    <td>
                        Selected item:
                        <fieldset class="siFieldset">
                            <asp:Label ID="SelectedItemLabel" runat="server" />
                        </fieldset>
                    </td>
                </tr>
            </tbody>
        </table>
        <telerik:RadFormDecorator ID="RadFormDecorator1" runat="server" DecoratedControls="Fieldset" />
        <!-- content end -->
        <telerik:Footer runat="server" ID="Footer1"></telerik:Footer>
        </form>
    </body>
    </html>

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