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Version Q2 2011 released 07/12/2011
select

TreeView / Drag-and-drop

Example Configuration
  • Drag & drop options:
RadTreeView1
  • Personal Folders
    • Deleted Items (6)
    • Drafts
    • Inbox (14)
      • Invoices
    • Junk E-mail
    • Outbox
    • Sent Items
    • Search Folders
      • Form Follow Up
      • Large Mail
      • Unread Mail
RadTreeView2
  • Personal Folders
    • Deleted Items (6)
    • Drafts
    • Inbox (14)
      • Invoices
    • Junk E-mail
    • Outbox
    • Sent Items
    • Search Folders
      • Form Follow Up
      • Large Mail
      • Unread Mail
TextBox
RadGrid
TextValueCategory
OneTwoThree
OneTwoThree
OneTwoThree

  • RadTreeView supports drag-and-drop functionality for tree-nodes. To enable this mode you need to mark the instance of RadTreeView with EnableDragAndDrop="True" and you will be able to drag and drop TreeNodes.

    RadTreeView  also supports drag-and-drop functionality for multiple tree-nodes. You can select multiple treenodes by setting 
    MultipleSelect="True".

    When RadTreeView detects a valid drag-and-drop operation (the selected node is dropped onto another node) it generates a NodeDrop server-side event. The event handler for NodeDrop can then perform specific action, by fetching both the source and destination drag/drop nodes.

    This example performs drag and drop functionality in all of the following ways:
    - drag and drop between nodes
    - drag and drop between trees
    - drag and drop to HTML elements

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 Language="c#" CodeFile="DefaultCS.aspx.cs" AutoEventWireup="true" Inherits="Telerik.Web.Examples.DragAndDropNodes.DefaultCS" %>

    <!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>
        <style type="text/css">
        span.label
        {
            color: #4888A3;
            padding: 4px 4px;
            display: block;
            margin-bottom: 7px;
            border-bottom: 1px solid #cccccc;
        }
        
        #ConfigurationPanel1 ul
        {
            list-style:none;
            margin:0;
            padding:0;
            float:left;
        }
        
        #ConfigurationPanel1 li
        {
            float:left;
            padding: 0 10px;
            border-left: solid 1px #b1d8eb;
            line-height: 24px;
        }
        #ConfigurationPanel1 li input,
        #ConfigurationPanel1 li label,
        #ConfigurationPanel1 li span
        {
            vertical-align:middle;
        }
        </style>
    </head>
    <body class="BODY">
        <form runat="server" id="mainForm" method="post">
            <qsf:Header runat="server" ID="Header1" NavigationLanguage="C#"></qsf:Header>
            <telerik:RadScriptManager runat="server" ID="RadScriptManager1">
            </telerik:RadScriptManager>
            <telerik:RadScriptBlock runat="Server" ID="RadScriptBlock1">

                <script type="text/javascript">        
                    /* <![CDATA[ */                                    
                    var gridId = "<%= RadGrid1.ClientID %>";
                    function isMouseOverGrid(target)
                    {
                        parentNode = target;
                        while (parentNode != null)
                        {                    
                            if (parentNode.id == gridId)
                            {
                                return parentNode;
                            }
                            parentNode = parentNode.parentNode;
                        }
            
                        return null;
                    }
            
                    function onNodeDragging(sender, args)
                    {
                        var target = args.get_htmlElement();    
                        
                        if(!target) return;
                        
                        if (target.tagName == "INPUT")
                        {        
                            target.style.cursor = "hand";
                        }

                        var grid = isMouseOverGrid(target)
                        if (grid)
                        {
                            grid.style.cursor = "hand";
                        }
                    }
            
                    function dropOnHtmlElement(args)
                    {                    
                     if(droppedOnInput(args))
                     return;
                    
                     if(droppedOnGrid(args))
                     return;                    
                    }
                    
                    function droppedOnGrid(args)
                    {
                     var target = args.get_htmlElement();
                    
                     while(target)
                     {
                     if(target.id == gridId)
                     {
                     args.set_htmlElement(target);
                     return;                                                  
                     }
                    
                     target = target.parentNode;
                     }
                     args.set_cancel(true);
                    }
                    
                    function droppedOnInput(args)
                    {
                     var target = args.get_htmlElement();
                        if (target.tagName == "INPUT")
                        {
                            target.style.cursor = "default";
                            target.value = args.get_sourceNode().get_text();        
                            args.set_cancel(true);
                            return true;
                        }                         
                    }
            
                    function dropOnTree(args)
                    {
                        var text = "";

                        if(args.get_sourceNodes().length)
                        {    
                            var i;
                            for(i=0; i < args.get_sourceNodes().length; i++)
                            {
                                var node = args.get_sourceNodes()[i];
                                text = text + ', ' +node.get_text();
                            }
                        }
                    }
                    
                    function clientSideEdit(sender, args)
                    {
                     var destinationNode = args.get_destNode();                                 
                    
                     if(destinationNode)
                     {            
                     var firstTreeView = $find('RadTreeView1');
                     var secondTreeView = $find('RadTreeView2');
                    
                            firstTreeView.trackChanges();
                            secondTreeView.trackChanges();
                            var sourceNodes = args.get_sourceNodes();
                     for (var i = 0; i < sourceNodes.length; i++)
                     {
                                var sourceNode = sourceNodes[i];
                                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();
                     secondTreeView.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 dest = args.get_destNode();
                        if (dest)
                        {
                         var clientSide = document.getElementById('ChbClientSide').checked;
        
                     if(clientSide)
                     {
                     clientSideEdit(sender, args);                
                     args.set_cancel(true);
                     return;
                     }
                        
                            dropOnTree(args);
                        }
                        else
                        {
                            dropOnHtmlElement(args);
                        }
                    }
            /* ]]> */
                </script>

            </telerik:RadScriptBlock>
            <telerik:RadAjaxManager runat="server" ID="RadAjaxManager1">
                <AjaxSettings>
                    <telerik:AjaxSetting AjaxControlID="ConfigurationPanel1">
                        <UpdatedControls>
                            <telerik:AjaxUpdatedControl ControlID="Panel1" LoadingPanelID="RadAjaxLoadingPanel1" />
                        </UpdatedControls>
                    </telerik:AjaxSetting>
                    <telerik:AjaxSetting AjaxControlID="Panel1">
                        <UpdatedControls>
                            <telerik:AjaxUpdatedControl ControlID="Panel1" LoadingPanelID="RadAjaxLoadingPanel1" />
                        </UpdatedControls>
                    </telerik:AjaxSetting>
                </AjaxSettings>
            </telerik:RadAjaxManager>
            <telerik:RadAjaxLoadingPanel runat="server" ID="RadAjaxLoadingPanel1" />
            <asp:Panel runat="server" ID="Panel1">
                <qsf:ConfiguratorPanel runat="server" ID="ConfigurationPanel1" Expanded="true">
                    <ul>
                        <li style="border-left: none"><span class="title">Drag &amp; drop options:</span>
                            <asp:CheckBox ID="ChbClientSide" runat="server" Checked="true" Text="Client-side drag &amp;amp; drop" /></li>
                        <li>
    <asp:CheckBox ID="ChbMultipleSelect" runat="server" Text="Multiple node selection" Checked="True"
    AutoPostBack="True" OnCheckedChanged="ChbMultipleSelect_CheckedChanged"></asp:CheckBox></li>
                        <li>
    <asp:CheckBox ID="ChbBetweenNodes" runat="server" Text="Drag and drop between nodes" Checked="True"
    AutoPostBack="True" OnCheckedChanged="ChbBetweenNodes_CheckedChanged"></asp:CheckBox></li>
                    </ul>
                </qsf:ConfiguratorPanel>
                <div style="background: url(Img/bg.gif) no-repeat; padding: 115px 0px 0px 15px;">
                    <div style="width: 180px; float: left;">
                        <span class="label">RadTreeView1</span>
                        <telerik:RadTreeView ID="RadTreeView1" runat="server" EnableDragAndDrop="True" OnNodeDrop="RadTreeView1_HandleDrop"
                            OnClientNodeDropping="onNodeDropping" OnClientNodeDragging="onNodeDragging" MultipleSelect="true" EnableDragAndDropBetweenNodes="true">
                        </telerik:RadTreeView>
                    </div>
                    <div style="width: 180px; float: left;">
                        <span class="label">RadTreeView2</span>
                        <telerik:RadTreeView ID="RadTreeView2" runat="server" EnableDragAndDrop="True" OnNodeDrop="RadTreeView1_HandleDrop"
                            OnClientNodeDropping="onNodeDropping" OnClientNodeDragging="onNodeDragging" MultipleSelect="true" EnableDragAndDropBetweenNodes="true">
                        </telerik:RadTreeView>
                    </div>
                    <div style="width: 110px; float: left">
                        <span class="label">TextBox</span>
                        <asp:TextBox runat="server" ID="NodeText" Style="width: 82px;"></asp:TextBox>
                    </div>
                    <div style="float: left">
                        <span class="label">RadGrid</span>
                        <telerik:RadGrid runat="server" ID="RadGrid1" Width="220px">
                        </telerik:RadGrid>
                        <asp:Label CssClass="textr" runat="server" ID="Label1"></asp:Label>
                    </div>
                    <div style="clear: both">
                    </div>
                </div>
            </asp:Panel>
            <qsf:Footer runat="server" ID="Footer1"></qsf:Footer>
        </form>
    </body>
    </html>

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