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Version Q2 2011 released 07/12/2011
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ListBox / Drag-and-drop

      
  • Argentina
  • Australia
  • Brazil
  • Canada
  • Chile
  • China
  • Egypt
  • England
  • France
  • Germany
  • India
  • Indonesia
  • Kenya
  • Mexico
  • New Zealand
  • South Africa
  
  • USA

  • RadListBox fully supports reordering and transferring of Items through drag-and-drop.

    You could enable the functionality by first configuring the corresponding RadListBox(es) to allow Reorder and/or Transfer and then setting the EnableDragAndDrop property to true.

    In addition to all corresponding events that fire on Reorder/Transfer RadListBox supports a few solely drag-and-drop events.

    At the client, these are:

    • DragStart - fires when the drag-and-drop operation starts. Can be canceled.
    • Dragging - fires while an Item is being dragged. Can be canceled.
    • Dropping - fires before the dragged Item is dropped. Can be canceled.
    • Dropped - fires after the dragged Item is dropped.

    After a successful drop the corresponding Reorder and Transfer client-side events fire.

    At the server, the Reorder or Transfer events fire only if the AutoPostBackOnReorder or AutoPostBackOnTransfer properties are set to true.

    Finally, the server-side Dropped event fires only if the dragged Items are dropped onto an HTML element, which is not an Item and has its id attribute set.

Source Code

C# VB.NET
Show code in new window Demo isolation steps
  • <%@ Page AutoEventWireup="true" CodeFile="DefaultVB.aspx.vb" Inherits="Telerik.Web.Examples.ListBox.DragAndDrop.DefaultVB"
        Language="VB" %>

    <%@ 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" %>
    <%@ 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 id="Head1" runat="server">
        <qsf:HeadTag runat="server" ID="Headtag1" />
        <style type="text/css">
            #targetTextBox
            {
            }
            #targetTextBox textarea
            {
                border: 1px solid #979797;
                font: 12px/1.2em "segoe ui" ,arial,sans-serif;
                cursor: default;
            }
            .example-panel
            {
                background: transparent url(bg.jpg) no-repeat 0 0;
                position: relative;
                width: 748px;
                height: 383px;
            }
            #RadListBox1
            {
                position: absolute;
                top: 143px;
                left: 68px;
            }
            #RadListBox2
            {
                position: absolute;
                top: 143px;
                left: 304px;
            }
            #targetTextBox
            {
                left: 545px;
                position: absolute;
                top: 143px;
            }
        </style>
    </head>
    <body class="BODY">
        <form runat="server" id="mainForm" method="post">
        <telerik:RadScriptManager runat="server" ID="RadScriptManager1" />
        <qsf:Header runat="server" ID="Header1" NavigationLanguage="VB" />
        <telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" CssClass="example-panel">
            <telerik:RadListBox ID="RadListBox1" runat="server" Width="200px" Height="200px"
                SelectionMode="Multiple" AllowTransfer="true" TransferToID="RadListBox2" AutoPostBackOnTransfer="true"
                AllowReorder="true" AutoPostBackOnReorder="true" EnableDragAndDrop="true" OnDropped="RadListBox_Dropped">
                <Items>
                    <telerik:RadListBoxItem Text="Argentina" />
                    <telerik:RadListBoxItem Text="Australia" />
                    <telerik:RadListBoxItem Text="Brazil" />
                    <telerik:RadListBoxItem Text="Canada" />
                    <telerik:RadListBoxItem Text="Chile" />
                    <telerik:RadListBoxItem Text="China" />
                    <telerik:RadListBoxItem Text="Egypt" />
                    <telerik:RadListBoxItem Text="England" />
                    <telerik:RadListBoxItem Text="France" />
                    <telerik:RadListBoxItem Text="Germany" />
                    <telerik:RadListBoxItem Text="India" />
                    <telerik:RadListBoxItem Text="Indonesia" />
                    <telerik:RadListBoxItem Text="Kenya" />
                    <telerik:RadListBoxItem Text="Mexico" />
                    <telerik:RadListBoxItem Text="New Zealand" />
                    <telerik:RadListBoxItem Text="South Africa" />
                </Items>
            </telerik:RadListBox>
            <telerik:RadListBox ID="RadListBox2" runat="server" Width="200px" Height="200px"
                SelectionMode="Multiple" AllowReorder="true" AutoPostBackOnReorder="true" EnableDragAndDrop="true"
                OnDropped="RadListBox_Dropped">
                <Items>
                    <telerik:RadListBoxItem Text="USA" />
                </Items>
            </telerik:RadListBox>
            <div id="targetTextBox">
                <asp:TextBox ID="TextBox1" runat="server" Wrap="true" Rows="3" TextMode="MultiLine"></asp:TextBox>
            </div>
        </telerik:RadAjaxPanel>
        <qsf:Footer runat="server" ID="Footer1" />
        </form>
    </body>
    </html>

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