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Version Q2 2011 released 07/12/2011
select

ListBox / Add/Remove/Disable items

Available actions
Available actions:
  • Amsterdam
  • Barcelona
  • Bonn
  • Boston
  • Brussels
  • Dallas
  • Denver
  • Dublin
  • Liverpool
  • London
  • Madrid
  • Miami
  • Moscow
  • New York
  • Oslo
  • Paris
  • San Francisco
  • Seattle
  • Sofia
  • St.Paul


Available actions
Available actions:
  • Amsterdam
  • Barcelona
  • Bonn
  • Boston
  • Brussels
  • Dallas
  • Denver
  • Dublin
  • Liverpool
  • London
  • Madrid
  • Miami
  • Moscow
  • New York
  • Oslo
  • Paris
  • San Francisco
  • Seattle
  • Sofia
  • St.Paul

Event log:

  • RadListBox provides rich client-side API for manipulating the items. You can add, remove, disable, reorder and transfer items.

    Insert items 

    var item = new Telerik.Web.UI.RadListBoxItem();
item.set_text("Item Text");
listBox.get_items().add(item);

    Delete items

    var item = listBox.getItem(0);
listBox.get_items().remove(item);

    Reorder items

    var item = listBox.getItem(0);
var index = item.get_index();
listBox.reorderItem(item, index - 1);

    Transfer items 

    //Transfer from source to destination
var item = listBoxSource.getItem(0);
listBoxSource.transferToDestination(item);

//Transfer from destination to source
var item = listBoxDestination.getItem(0);
listBox.transferFromDestination(item);

    Disable items 

    var item = listBox.getItem(0);
item.disable();

Source Code

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

    <%@ 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" />
        <link rel="stylesheet" href="styles.css" type="text/css" />
    </head>
    <body class="BODY">
    <form id="Form1" runat="server">
        <telerik:RadScriptManager runat="server" ID="RadScriptManager1" />
        <qsf:Header ID="Header2" runat="server" NavigationLanguage="VB" />
        
        <telerik:RadCodeBlock runat="server" ID="RadCodeBlock1">
            <script type="text/javascript">
                //<![CDATA[
                var listBox;

                function pageLoad() {
                    listBox = $find("<%= RadListBox1.ClientID %>");
                }

                function addItem() {
                    var itemText = $find("<%= RadTextBox1.ClientID %>").get_value();
                    if (!itemText) {
                        alert("Please specify the text for the new item.");
                        return false;
                    }

                    listBox.trackChanges();
                    //Instantiate a new client item
                    var item = new Telerik.Web.UI.RadListBoxItem();
                    item.set_text(itemText);
                    item.set_selected(true);

                    listBox.get_items().add(item);
                    item.scrollIntoView();
                    listBox.commitChanges();
                    return false;
                }

                function deleteItem() {
                    if (listBox.get_items().get_count() < 1) {
                        alert("The listBox is empty.");
                        return false;
                    }

                    var selectedItem = listBox.get_selectedItem();
                    if (!selectedItem) {
                        alert("You need to select a item first.");
                        return false;
                    }

                    if (listBox.get_items().get_count().length == 1) {
                        if (!confirm("This is the last item in the listBox. Are you sure you want to delete it?"))
                            return false;
                    }

                    listBox.deleteItem(selectedItem);
                    return false;
                }

                function disableItem() {
                    var selectedItem = listBox.get_selectedItem();
                    if (!selectedItem) {
                        alert("You need to select a item first.");
                        return false;
                    }

                    listBox.trackChanges();

                    selectedItem.disable();

                    listBox.commitChanges();

                    return false;
                }

                function enableAllItems() {
                    for (var i = 0; i < listBox.get_items().get_count(); i++) {
                        listBox.get_items().getItem(i).enable();
                    }

                    return false;
                }

                function reorderUp() {
                    if (listBox.get_items().get_count() < 1) {
                        alert("The listBox is empty.");
                        return false;
                    }

                    var selectedItem = listBox.get_selectedItem();
                    if (selectedItem == null) {
                        alert("You need to select a item first.");
                        return false;
                    }
                    
                    var index = selectedItem.get_index();
                    if (index < 1) {
                        alert("Cannot reorder the first item");
                        return false;
                    }

                    listBox.reorderItem(selectedItem, index - 1);
                    return false;
                }

                function reorderDown() {
                    if (listBox.get_items().get_count() < 1) {
                        alert("The listBox is empty.");
                        return false;
                    }

                    var selectedItem = listBox.get_selectedItem();
                    if (selectedItem == null) {
                        alert("You need to select a item first.");
                        return false;
                    }
                    
                    var index = selectedItem.get_index();
                    if (index == listBox.get_items().get_count() - 1) {
                        alert("Cannot reorder the last item");
                        return false;
                    }

                    listBox.reorderItem(selectedItem, index + 1);
                    return false;
                }

                function transferRight() {
                    var listBox2 = $find("<%= RadListBox2.ClientID %>");
                    
                    var selectedItem = listBox2.get_selectedItem();
                    if (selectedItem == null) {
                        alert("You need to select a item first.");
                        return false;
                    }

                    listBox2.transferToDestination(selectedItem);
                    return false;
                }
                
                function transferLeft() {
                    var listBox2 = $find("<%= RadListBox2.ClientID %>");
                    var listBox3 = listBox2.get_transferTo();
                    var selectedItem = listBox3.get_selectedItem();
                    if (selectedItem == null) {
                        alert("You need to select a item first.");
                        return false;
                    }

                    listBox2.transferFromDestination(selectedItem);
                    return false;
                }
                
                //]]>
            </script>

        </telerik:RadCodeBlock>
        
        <div class="topContainer">
            <qsf:ConfiguratorPanel runat="server" ID="ConfigurationPanel1" Title="Available actions" Orientation="Vertical" CssClass="qsfRightConfig" Expanded="true">
             <div class="title">Available actions:</div>
                
             <ul class="qsfexAvailableActions">
                 <li>
                     <asp:Button ID="Button5" CssClass="qsfButtonBig" OnClientClick="return reorderUp()" Text="Move Up" runat="server" />
                     <asp:Button ID="Button6" CssClass="qsfButtonBig" OnClientClick="return reorderDown()" Text="Move Down" runat="server" />
                 </li>
                 <li>
                     <asp:Button ID="Button4" CssClass="qsfButtonBig" OnClientClick="return disableItem()" Text="Disable Selected Item" runat="server" />
                     <asp:Button ID="Button7" CssClass="qsfButtonBig" OnClientClick="return enableAllItems()" Text="Enable All Items" runat="server" />
                 </li>
                 <li>
                     <asp:Button ID="Button3" CssClass="qsfButtonBig" OnClientClick="return deleteItem()" Text="Delete Selected Item" runat="server" />
                 </li>
                 <li>
                     <telerik:RadTextBox runat="server" ID="RadTextBox1" Text="New Item" />
                     <asp:Button ID="Button1" CssClass="qsfButton" OnClientClick="return addItem()" Text="Add New Item" runat="server" />
                 </li>
                 <li>
                     <asp:Button ID="Button2" CssClass="qsfButton" Text="Postback" runat="server" OnClick="Button2_Click" />
                 </li>
             </ul>
         </qsf:ConfiguratorPanel>
            <telerik:RadListBox ID="RadListBox1" runat="server" Height="230px" /><br /><br />
        </div>

           <div style="overflow: hidden">
            <qsf:ConfiguratorPanel runat="server" ID="ConfiguratorPanel2" Title="Available actions" Orientation="Vertical" CssClass="qsfRightConfig" Expanded="true">
                 <div class="title">Available actions:</div>
                    
                 <ul class="qsfexAvailableActions" style="clear: both">
                     <li>
                         <asp:Button ID="Button13" CssClass="qsfButtonBig" OnClientClick="return transferRight()" Text="Transfer Right" runat="server" />
                         <asp:Button ID="Button12" CssClass="qsfButtonBig" OnClientClick="return transferLeft()" Text="Transfer Left" runat="server" />
                     </li>
                 </ul>
         </qsf:ConfiguratorPanel>
                        
         <telerik:RadListBox ID="RadListBox2" runat="server" Height="230px" TransferToID="RadListBox3" />
         <telerik:RadListBox ID="RadListBox3" runat="server" Height="230px" /><br />
        </div>

        <qsf:EventLogConsole runat="server" ID="EventLogConsole1" />
        <qsf:Footer ID="Footer2" runat="server" />
    </form>
    </body>
    </html>

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