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Insert items to destination listbox - serverside

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ListBox
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ARJUN
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ARJUN asked on 14 Jul 2014, 03:16 PM
Hi,

I'm trying to insert items to destination listbox to desired index. If any item is selected in the destination lisbox then the transfered items should be inserted above the selected item. I'm using allowtransfer property for transferring the items.

In transferring event i used "e.Cancel" to cancel the regular transfer when there is any item selected in the destination listbox. 

e.Cancel = True

For Each item As RadListBoxItem In e.Items
     e.DestinationListBox.Items.Insert(e.DestinationListBox.SelectedIndex, item)
Next

Insert doesn't work. What am I doing wrong? It doesn't give any error but doesn't work either. I have other functionality for which I have to make this happen through code behind itself.

Thanks,
Arjun

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Shinu
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answered on 15 Jul 2014, 07:56 AM
Hi ARJUN,

Please have a look into the sample code snippet which works fine at my end. Please provide your full code if it doesn't help.

ASPX:
<telerik:RadListBox ID="rlstboxSourceList" runat="server" AutoPostBackOnTransfer="true" SelectionMode="Multiple" AllowTransfer="true" TransferToID="rlstboxDestinationList" OnTransferring="rlstboxSourceList_Transferring1">
    <Items>
        <telerik:RadListBoxItem Text="Item1" />
        <telerik:RadListBoxItem Text="Item2" />
        <telerik:RadListBoxItem Text="Item3" />
        <telerik:RadListBoxItem Text="Item4" />
        <telerik:RadListBoxItem Text="Item5" />
        <telerik:RadListBoxItem Text="Item6" />
    </Items>
</telerik:RadListBox>
<telerik:RadListBox ID="rlstboxDestinationList" runat="server" SelectionMode="Multiple">
    <Items>
        <telerik:RadListBoxItem Text="Item7" />
        <telerik:RadListBoxItem Text="Item8" />
    </Items>
</telerik:RadListBox>

VB:
Protected Sub rlstboxSourceList_Transferring1(sender As Object, e As Telerik.Web.UI.RadListBoxTransferringEventArgs)
    Dim index As Integer
    For Each item As RadListBoxItem In e.Items
        index = e.DestinationListBox.SelectedIndex
        rlstboxDestinationList.Items.Insert(index, item)
    Next
End Sub

Thanks,
Shinu.
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ARJUN
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answered on 15 Jul 2014, 06:54 PM
Hi Shinu,

Thanks for your response. The code which you posted works fine but that's the exact same thing what i have at my side too. I think I'm missing something. Below is my code.

<telerik:RadListBox ID="RadListBox_Left" Height="300px" Width="300px" runat="server"
         AllowTransfer="true" TransferMode="Move" TransferToID="RadListBox_Right" Sort="Ascending"
         SelectionMode="Multiple" AllowTransferOnDoubleClick="false" AutoPostBackOnTransfer="true" >
</telerik:RadListBox>

<telerik:RadListBox ID="RadListBox_Right" Height="300px" Width="300px" runat="server" 
         AllowReorder="true">
</telerik:RadListBox>

Protected Sub RadListBox_Left_Transferring(ByVal sender As Object, ByVal e As Telerik.Web.UI.RadListBoxTransferringEventArgs) Handles RadListBox_Left.Transferring
        If e.DestinationListBox.ID = "RadListBox_Right" Then
            If e.DestinationListBox.SelectedIndex > -1 Then
                 For Each item As RadListBoxItem In e.Items
                       RadListBox_Right.Items.Insert(e.DestinationListBox.SelectedIndex, item)
                Next
            End If
        End If
    End Sub

Thanks,
Arjun
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Shinu
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answered on 16 Jul 2014, 03:56 AM
Hi ARJUN,

From your code I have noticed you are not setting SelectionMode as Multiple for the Source RadListBox. Please do the following modification in your code which works fine at my end.

ASPX:
<telerik:RadListBox ID="rlstboxDestinationList" runat="server" AllowReorder="true"
    SelectionMode="Multiple">
</telerik:RadListBox>

Thanks,
Shinu.
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ARJUN
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answered on 16 Jul 2014, 01:35 PM
Hi Shinu,

Thanks. That works fine now. 

Is there a way to get this working without the multiple selection for destination.....???? I cannot use multiple selection in destination listbox due to my application scenario. Not using multiple selection is a major thing for my application. 

Can you suggest work around for this.

Thanks,
Arjun
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ARJUN
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answered on 16 Jul 2014, 01:53 PM
Shinu,

It's the multiple selection which is not letting the insert work. 

For Each item As RadListBoxItem In e.Items
      RadListBox_Right.Items.Insert(index, item)
      RadListBox_Right.Items(index).Selected = False
Next

The above code lets any number of items to be inserted to destination. 

This solves my issue. 

Thanks,
Arjun
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ARJUN
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Shinu
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ARJUN
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