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Version Q1 2012 released 04/11/2012
select

TreeView / Validating Selection

  • Aniseed Syrup
    • OrderID: 10289, Quantity: 30, Unit Price: 8.00
    • OrderID: 10405, Quantity: 50, Unit Price: 8.00
    • OrderID: 10485, Quantity: 20, Unit Price: 8.00
    • OrderID: 10540, Quantity: 60, Unit Price: 10.00
    • OrderID: 10591, Quantity: 14, Unit Price: 10.00
    • OrderID: 10702, Quantity: 6, Unit Price: 10.00
    • OrderID: 10742, Quantity: 20, Unit Price: 10.00
    • OrderID: 10764, Quantity: 20, Unit Price: 10.00
    • OrderID: 10849, Quantity: 49, Unit Price: 10.00
    • OrderID: 10857, Quantity: 30, Unit Price: 10.00
    • OrderID: 11017, Quantity: 25, Unit Price: 10.00
    • OrderID: 11077, Quantity: 4, Unit Price: 10.00
  • Chocolade
    • OrderID: 10403, Quantity: 70, Unit Price: 10.20
    • OrderID: 10453, Quantity: 15, Unit Price: 10.20
    • OrderID: 10507, Quantity: 15, Unit Price: 12.75
    • OrderID: 10604, Quantity: 6, Unit Price: 12.75
    • OrderID: 10704, Quantity: 24, Unit Price: 12.75
    • OrderID: 10814, Quantity: 8, Unit Price: 12.75
 
Process Orders >

  • This example demonstrates RadTreeView's validation support. By using a RequiredFieldValidator control you can verify that your users have selected a tree node: 
    <telerik:RadTreeView runat="server" ID="RadTreeView1">
  <Nodes>
    <telerik:RadTreeNode Text="Node 1">
      <Nodes>
         <telerik:RadTreeNode Text="Node 1.1" />
         <telerik:RadTreeNode Text="Node 1.2" />
      </Nodes>
    </telerik:RadTreeNode>
  </Nodes>
</telerik:RadTreeNode>

<asp:RequiredFieldValidator runat="server" 
 ID="RequiredFieldValidator1" 
 ControlToValidate="RadTreeView1"
 ErrorMessage="Please select a node" 
/>
    RadTreeView can also can trigger validation. You can use the ValidationGroup property to specify the validation group that should be triggered.

Source Code

C# VB.NET
Show code in new window Demo isolation steps
  • <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
    <%@ Register TagPrefix="qsf" TagName="Footer" Src="~/Common/Footer.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="HeadTag" Src="~/Common/HeadTag.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="Header" Src="~/Common/Header.ascx" %>
    <%@ Register TagPrefix="qsf" Namespace="Telerik.QuickStart" %>

    <%@ Page AutoEventWireup="true" CodeFile="DefaultCS.aspx.cs" Inherits="Telerik.Examples.TreeView.Validating.DefaultCS"
        Language="c#" %>

    <!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">
        <qsf:HeadTag runat="server" ID="Headtag1"></qsf:HeadTag>
        <link rel="stylesheet" type="text/css" href="styles.css" />
    </head>
    <body class="BODY">
        <form runat="server" id="mainForm">
            <qsf:Header runat="server" ID="Header1" NavigationLanguage="C#"></qsf:Header>
            <telerik:RadScriptManager runat="server" ID="RadScriptManager1" />
            <telerik:RadAjaxManager runat="Server" ID="RadAjaxManager1">
                <AjaxSettings>
                    <telerik:AjaxSetting AjaxControlID="Button1">
                        <UpdatedControls>
                            <telerik:AjaxUpdatedControl ControlID="PendingOrdersPanel" />
                            <telerik:AjaxUpdatedControl ControlID="ProcessedOrdersPanel" LoadingPanelID="RadAjaxLoadingPanel1" />
                        </UpdatedControls>
                    </telerik:AjaxSetting>
                </AjaxSettings>
            </telerik:RadAjaxManager>
            <telerik:RadAjaxLoadingPanel runat="server" ID="RadAjaxLoadingPanel1">
            </telerik:RadAjaxLoadingPanel>
            <div class="example-panel">
                <asp:Panel runat="server" ID="PendingOrdersPanel">
                    <telerik:RadTreeView runat="server" ID="RadTreeView1" MultipleSelect="true" OnClientNodeClicked="onNodeClick"
                        Height="220px" Width="320px">
                        <Nodes>
                            <telerik:RadTreeNode Text="Aniseed Syrup" Value="3" Category="Product" />
                            <telerik:RadTreeNode Text="Chocolade" Value="48" Category="Product" />
                        </Nodes>
                    </telerik:RadTreeView>
    <asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator1" ControlToValidate="RadTreeView1"
    ErrorMessage="<span class='validationMsg'>Please select a product or an order</span>"
                        EnableClientScript="true" />
                </asp:Panel>
    <asp:LinkButton runat="server" ID="Button1" CssClass="process" OnClick="Button1_Click"
    Text="Process Orders &gt;" />
                <asp:Panel runat="server" ID="ProcessedOrdersPanel">
                    <telerik:RadGrid runat="server" ID="RadGrid1" AutoGenerateColumns="False" AllowPaging="true"
                        OnNeedDataSource="RadGrid1_NeedDataSource" PageSize="5" Visible="false">
                        <PagerStyle Mode="NextPrev" />
                        <MasterTableView>
                            <Columns>
                                <telerik:GridBoundColumn DataField="Value" HeaderText="OrderID" />
                            </Columns>
                        </MasterTableView>
                    </telerik:RadGrid>
                </asp:Panel>
            </div>

            <script type="text/javascript">
            /* <![CDATA[ */
                function onNodeClick(sender, args)
                {
                    var node = args.get_node();
                    if (node.get_category() == "Product")
                    {
                        var childNodes = node.get_nodes();
                        for (var i = 0; i < childNodes.get_count(); i++)
                        {
                            var childNode = childNodes.getNode(i);
                            childNode.select();
                        }
                    }
                }
            /* ]]> */
            </script>

            <qsf:Footer runat="server" ID="Footer1"></qsf:Footer>
        </form>
    </body>
    </html>

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