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Version Q2 2011 released 07/12/2011
select

TreeView / Accessibility

  • Books
    • Arts
    • Biographies
    • Children's Books
    • Cooking
    • History
    • Fiction
    • Mystery
    • Nonfiction
    • Romance
    • Science Fiction
  • Music
  • Software

Accessibility validation

Validate with WAVE

WAVE is a free web accessibility evaluation tool, which checks for compliance issues with many of the Section 508 and WCAG guidelines. Have in mind that only humans can determine whether a web page is accessible - the above validation link is provided for the sake of completeness.


  • This example shows the accessibility features of RadTreeView for ASP.NET AJAX. It has keyboard navigation enabled as well as checkboxes and drag-and-drop.

    Telerik RadTreeView for ASP.NET AJAX is level A accessible (in compliance with the W3C Web Accessibility Guidelines 2.0) as well as Section 508 compliant.

Source Code

C# VB.NET
Show code in new window Demo isolation steps
  • <%@ Page Language="c#" CodeFile="DefaultCS.aspx.cs" AutoEventWireup="true" Inherits="Telerik.Web.Examples.TreeView.Accessibility.DefaultCS" %>

    <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
    <%@ Register TagPrefix="qsf" Namespace="Telerik.QuickStart" %>
    <%@ Register TagPrefix="qsf" TagName="Header" Src="~/Common/Header.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="HeadTag" Src="~/Common/HeadTag.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="Footer" Src="~/Common/Footer.ascx" %>
    <!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 ID="Headtag1" runat="server"></qsf:HeadTag>
    </head>
    <body class="BODY">
        <form id="mainForm" method="post" runat="server">
        <script type="text/javascript">
            function clientSideEdit(sender, args, sourceNode) {
                var destinationNode = args.get_destNode();
                if (destinationNode) {
                    var firstTreeView = $find('RadTreeView1');

                    firstTreeView.trackChanges();
                    sourceNode.get_parent().get_nodes().remove(sourceNode);

                    if (args.get_dropPosition() == "over") destinationNode.get_nodes().add(sourceNode);
                    if (args.get_dropPosition() == "above") insertBefore(destinationNode, sourceNode);
                    if (args.get_dropPosition() == "below") insertAfter(destinationNode, sourceNode);
                    destinationNode.set_expanded(true);
                    firstTreeView.commitChanges();
                }
            }

            function insertBefore(destinationNode, sourceNode) {
                var destinationParent = destinationNode.get_parent();
                var index = destinationParent.get_nodes().indexOf(destinationNode);
                destinationParent.get_nodes().insert(index, sourceNode);
            }

            function insertAfter(destinationNode, sourceNode) {
                var destinationParent = destinationNode.get_parent();
                var index = destinationParent.get_nodes().indexOf(destinationNode);
                destinationParent.get_nodes().insert(index + 1, sourceNode);
            }

            function onNodeDropping(sender, args) {
                var sourceNodes = args.get_sourceNodes();
                var dest = args.get_destNode();
                var sourceParent;
                for (var i = 0; i < sourceNodes.length; i++) {
                    if (dest) {
                        {
                            clientSideEdit(sender, args, sourceNodes[i]);
                            args.set_cancel(true);
                        }
                    }
                }
            }
        </script>
        <telerik:RadScriptManager ID="ScriptManager" runat="server" />
        <qsf:Header ID="Header1" runat="server" NavigationLanguage="C#" XhtmlCompliant="False"
            ShowSkinChooser="false"></qsf:Header>
        <div>
            <telerik:RadTreeView runat="server" ID="RadTreeView1" Skin="Simple" AccessKey="T"
                TabIndex="1" EnableDragAndDrop="True" EnableDragAndDropBetweenNodes="True" CheckBoxes="true"
                TriStateCheckBoxes="false" OnClientNodeDropping="onNodeDropping" MultipleSelect="True">
                <Nodes>
                    <telerik:RadTreeNode Text="Books" Expanded="true">
                        <Nodes>
                            <telerik:RadTreeNode Text="Arts" />
                            <telerik:RadTreeNode Text="Biographies" />
                            <telerik:RadTreeNode Text="Children's Books" />
                            <telerik:RadTreeNode Text="Cooking" />
                            <telerik:RadTreeNode Text="History" />
                            <telerik:RadTreeNode Text="Fiction" />
                            <telerik:RadTreeNode Text="Mystery" />
                            <telerik:RadTreeNode Text="Nonfiction" />
                            <telerik:RadTreeNode Text="Romance" />
                            <telerik:RadTreeNode Text="Science Fiction" />
                        </Nodes>
                    </telerik:RadTreeNode>
                    <telerik:RadTreeNode Text="Music">
                        <Nodes>
                            <telerik:RadTreeNode Text="Alternative" />
                            <telerik:RadTreeNode Text="Blues" />
                            <telerik:RadTreeNode Text="Children's Music" />
                            <telerik:RadTreeNode Text="Classical" />
                            <telerik:RadTreeNode Text="Country" />
                            <telerik:RadTreeNode Text="Dance" />
                            <telerik:RadTreeNode Text="Folk" />
                            <telerik:RadTreeNode Text="Hard Rock" />
                            <telerik:RadTreeNode Text="Jazz" />
                            <telerik:RadTreeNode Text="Soundtracks" />
                        </Nodes>
                    </telerik:RadTreeNode>
                    <telerik:RadTreeNode Text="Software">
                        <Nodes>
                            <telerik:RadTreeNode Text="Database" />
                            <telerik:RadTreeNode Text="Networking" />
                        </Nodes>
                    </telerik:RadTreeNode>
                </Nodes>
            </telerik:RadTreeView>
        </div>
        <div style="clear: both;">
            <h3>
                Accessibility validation</h3>
            <asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click">Validate with WAVE</asp:LinkButton>
            <p>
                WAVE is a free web accessibility evaluation tool, which checks for compliance issues
                with many of the Section 508 and WCAG guidelines. Have in mind that only humans
                can determine whether a web page is accessible - the above validation link is provided
                for the sake of completeness.</p>
        </div>
        <qsf:Footer ID="Footer1" runat="server"></qsf:Footer>
        </form>
    </body>
    </html>

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