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Remove RadListItem from Code Behind

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ListBox

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7 Answers, 1 is accepted

answered on 20 Feb 2019, 09:07 AM

Hi Mitch,

Here is a sample implementation that clears the destination ListBox items if the "Item 3" item is transferred:

<telerik:RadListBox runat="server" ID="RadListBox1" AutoPostBackOnTransfer="True" TransferToID="RadListBox2" AllowTransfer="true" OnTransferring="RadListBox1_Transferring">

<Items>

<telerik:RadListBoxItem Text="Item 1" />

<telerik:RadListBoxItem Text="Item 2" />

<telerik:RadListBoxItem Text="Item 3" />

<telerik:RadListBoxItem Text="Item 4" />

</Items>

</telerik:RadListBox>

<telerik:RadListBox runat="server" ID="RadListBox2" >

<Items>

<telerik:RadListBoxItem Text="Secondary Item 1" />

<telerik:RadListBoxItem Text="Secondary Item 2" />

<telerik:RadListBoxItem Text="Secondary Item 3" />

<telerik:RadListBoxItem Text="Secondary Item 4" />

</Items>

</telerik:RadListBox>

protected void RadListBox1_Transferring(object sender, Telerik.Web.UI.RadListBoxTransferringEventArgs e)

{

if (e.Items[0].Text == "Item 3")

{

e.DestinationListBox.Items.Clear();

}

Regards,
Peter Milchev
Progress Telerik

Get quickly onboarded and successful with your Telerik and/or Kendo UI products with the Virtual Classroom free technical training, available to all active customers. Learn More.

answered on 22 Feb 2019, 01:25 PM

Hello Mitch,

Is it possible to replicate the issue with the markup that I have provided?

If yes, please provide more detailed reproduction steps (a screencast would be the best) so that we can check it on our side.

If not, please prepare a sample runnable project showing the issue and attach it to an official support ticket. That would allow us to investigate locally your exact scenario and provide more accurate and specific suggestions.

Once we have a solution, we can share it here for convenience and better visibility from the community.

Regards,
Peter Milchev
Progress Telerik

Get quickly onboarded and successful with your Telerik and/or Kendo UI products with the Virtual Classroom free technical training, available to all active customers. Learn More.

answered on 25 Feb 2019, 08:58 PM

There are two Radlistboxes.

When the application initially executes there will be 32 teams plus a

"FINAL" team within the first listbox. Users are free to drag and drop between the two listboxes, however, when the

"FINAL" team is dragged over to the 2nd listbox then anything that was

previously in the 2nd listbox needs to be deleted/removed.

I have attached the code if it would be easier I could send a zip file with the solution that way you don't have to set it up let me know.

Thanks,

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="NFL_Teams.master.cs" Inherits="NFL_Teams" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">

<title>G2 Adjudication</title>

<meta http-equiv="cache-control" content="no-cache" />

<meta http-equiv="pragma" content="no-cache" />

<meta http-equiv="expires" content="0" />

<meta http-equiv="X-UA-Compatible" content="IE=Edge" />

<asp:ContentPlaceHolder ID="HeadContent" runat="server">

</asp:ContentPlaceHolder>

</head>

<body>

<form id="form1" runat="server">

<asp:ScriptManager ID="MasterScriptManager" runat="server" />

<div>

<asp:ContentPlaceHolder id="PageTitle" runat="server">

</asp:ContentPlaceHolder>

</div>

</form>

</body>

</html>

<%@ Page Title="" Language="C#" MasterPageFile="~/NFL_Teams.master" AutoEventWireup="true" CodeFile="NFL_Teams.aspx.cs" Inherits="NFL_Teams" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" Runat="Server">

</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="PageTitle" Runat="Server">

<telerik:RadListBox ID="lbNFL_Teams" runat="server" DataTextField="TeamDesc" Width="400px" Height="300px" DataSortField="TeamID" OnReordered="lbNFL_Teams_Reordered"

DataValueField="TeamID" AppendDataBoundItems="true" AutoPostBack="false" CausesValidation="false" AllowTransferOnDoubleClick="true" OnTransferred="lbNFL_Teams_Transferred"

SelectionMode="Multiple" AllowTransfer="true" TransferToID="lbNFL_Teams_Assigned" AutoPostBackOnTransfer="true"

AllowReorder="true" AutoPostBackOnReorder="true" EnableDragAndDrop="true" TabIndex="24" ButtonSettings-ShowReorder="false"

ButtonSettings-ShowTransfer="false" ButtonSettings-ShowTransferAll="false" style="font-family: Arial; font-size: small;">

</telerik:RadListBox>

<telerik:RadListBox ID="lbNFL_Teams_Assigned" runat="server" DataTextField="TeamDesc" Width="400px" Height="300px" OnTransferred="lbNFL_Teams_Assigned_Transferred"

DataValueField="TeamID" AppendDataBoundItems="true" AutoPostBack="false" CausesValidation="false" AllowTransferOnDoubleClick="true"

SelectionMode="Multiple" AllowTransfer="true" TransferToID="lbNFL_Teams" AutoPostBackOnTransfer="true"

AllowReorder="true" AutoPostBackOnReorder="true" EnableDragAndDrop="true" TabIndex="25" ButtonSettings-ShowReorder="false"

ButtonSettings-ShowTransfer="false" ButtonSettings-ShowTransferAll="false" style="font-family: Arial; font-size: small;">

</telerik:RadListBox>

</asp:Content>

using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using Telerik.Web.UI;

public partial class NFL_Teams : System.Web.UI.Page

{

public static List<int> gStatuses = new List<int>();

int intStatus = 0;

protected void Page_Load(object sender, EventArgs e)

{

TeamsManager tm = new TeamsManager();

if (!Page.IsPostBack)

{

lbNFL_Teams.Items.Clear();

lbNFL_Teams.DataSource = tm.GetTeams();

lbNFL_Teams.DataBind();

}

if (lbNFL_Teams.Items.Count > 0)

intStatus = Convert.ToInt32(lbNFL_Teams.Items[0].Value);

else

intStatus = 0;

}

protected void lbNFL_Teams_Transferred(object sender, Telerik.Web.UI.RadListBoxTransferredEventArgs e)

{

TeamsManager tm = new TeamsManager();

Teams Team = new Teams();

SortListBoxItems(ref lbNFL_Teams, true);

gStatuses.Clear();

foreach (RadListBoxItem li in lbNFL_Teams_Assigned.Items)

{

Team = tm.GetIndividualTeam(li.Text);

gStatuses.Add(Team.TeamID);

}

protected void lbNFL_Teams_Assigned_Transferred(object sender, Telerik.Web.UI.RadListBoxTransferredEventArgs e)

{

TeamsManager tm = new TeamsManager();

Teams Team = new Teams();

Boolean blnFinal = false;

foreach (RadListBoxItem li in lbNFL_Teams_Assigned.Items)

{

Team = tm.GetIndividualTeam(li.Text);

if (Team.TeamDesc == "FINAL")

blnFinal = true;

}

if (intStatus == 1 && blnFinal == true)

{

blnFinal = false;

foreach (RadListBoxItem li in lbNFL_Teams_Assigned.Items)

{

Team = tm.GetIndividualTeam(li.Text);

if (gStatuses.Contains(Team.TeamID))

{

RadListBoxItem itemToRemove = lbNFL_Teams_Assigned.FindItemByText(Team.TeamDesc);

lbNFL_Teams.Items.Remove(itemToRemove);

gStatuses.Remove(Team.TeamID);

}

else

{

gStatuses.Clear();

foreach (RadListBoxItem li in lbNFL_Teams_Assigned.Items)

{

Team = tm.GetIndividualTeam(li.Text);

gStatuses.Add(Team.TeamID);

}

private void SortListBoxItems(ref RadListBox rlb, bool pByValue)

{

SortedList lListItems = new SortedList();

foreach(RadListBoxItem li in rlb.Items)

{

if (pByValue) lListItems.Add(li.Value, li);

else lListItems.Add(li.Text, li);

}

rlb.Items.Clear();

//add sorted items to listbox

for (int i = 0; i < lListItems.Count; i++)

{

rlb.Items.Add((RadListBoxItem)lListItems[lListItems.GetKey(i)]);

}

protected void lbNFL_Teams_Reordered(object sender, RadListBoxEventArgs e)

{

TeamsManager tm = new TeamsManager();

Teams Team = new Teams();

SortListBoxItems(ref lbNFL_Teams, true);

gStatuses.Clear();

foreach (RadListBoxItem li in lbNFL_Teams_Assigned.Items)

{

Team = tm.GetIndividualTeam(li.Text);

gStatuses.Add(Team.TeamID);

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

/// <summary>

/// Summary description for TeamsManager

/// </summary>

public class TeamsManager

{

public TeamCollection GetTeams()

{

return new TeamsDB().GetTeams();

}

public Teams GetIndividualTeam(string TeamDesc)

{

return new TeamsDB().GetIndividualTeam(TeamDesc);

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

/// <summary>

/// Summary description for BusinessBase

/// </summary>

public class BusinessBase<T> : List<T>

{

public void Sort(IComparer<T> comparer)

{

if (comparer == null)

throw new ArgumentNullException("comparer", "Comparer is null.");

List<T> list = this as List<T>;

if (list == null)

return;

list.Sort(comparer);

}

public System.Data.DataTable ToDataTable<R>()

{

IList<R> collection = (IList<R>)this;

System.Data.DataTable dt = CreateTable<R>();

Type type = typeof(T);

System.ComponentModel.PropertyDescriptorCollection properties = System.ComponentModel.TypeDescriptor.GetProperties(type);

foreach (R item in collection)

{

System.Data.DataRow row = dt.NewRow();

foreach (System.ComponentModel.PropertyDescriptor prop in properties)

row[prop.Name] = prop.GetValue(item);

dt.Rows.Add(row);

}

return dt;

}

private System.Data.DataTable CreateTable<R>()

{

Type type = typeof(R);

System.Data.DataTable dt = new System.Data.DataTable(type.Name);

System.ComponentModel.PropertyDescriptorCollection properties = System.ComponentModel.TypeDescriptor.GetProperties(type);

foreach (System.ComponentModel.PropertyDescriptor prop in properties)

dt.Columns.Add(prop.Name, prop.PropertyType);

return dt;

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Text;

/// <summary>

/// Summary description for Teams

/// </summary>

public class Teams

{

public Teams()

{

TeamID = 0;

TeamDesc = string.Empty;

TeamConference = string.Empty;

TeamDivision = string.Empty;

}

public int TeamID { get; set; }

public string TeamDesc { get; set; }

public string TeamConference { get; set; }

public string TeamDivision { get; set; }

}

public class TeamCollection: BusinessBase<Teams>

{

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data;

using Microsoft.SqlServer.Server;

using System.Data.SqlClient;

using System.Data.SqlTypes;

/// <summary>

/// Summary description for TeamsDB

/// </summary>

internal class TeamsDB

{

public TeamCollection GetTeams()

{

TeamCollection uCollection = new TeamCollection();

Teams Team = new Teams();

Team.TeamID = 1;

Team.TeamDesc = "FINAL";

Team.TeamConference = "FINAL";

Team.TeamDivision = "FINAL";