Creating Undo Button for RadListBox

2 posts, 0 answers
  1. Caleb
    Caleb avatar
    5 posts
    Member since:
    Apr 2012

    Posted 23 Apr 2012 Link to this post

    I was told to add an undo button for the RadListBox that will track and then revert he changes a user makes. I have the code set up but I am getting undefined errors in dynmiac code when it is running through transferItem(). I am not entirely sure whats going wrong with it. If someone could look and give some advice that would be great.

    var UndoList = new Array();
    function onClientTransferring(sender, e) {
        var items = e.get_items();
        for (var i = 0; i < items.length; i++) {
            var item = items[i];
            if (item.get_text() != "Select" || item.get_value() != "") {
    function undoChanges() {
        if (UndoList[UndoList.length - 1]._clientStateFieldID == "rlbStations_ClientState") {
        var listbox = $find('rlbStations');
    else if (UndoList[UndoList.length - 1]._clientStateFieldID == "rlbAllowedStations_ClientState") {
        var listbox = $find('rlbAllowedStations');
        listbox.transferItem(UndoList[UndoList.length - 3], UndoList[UndoList.length - 1], UndoList[UndoList.length - 2]);
    <telerik:RadListBox ID="rlbStations" runat="server" AllowTransfer="True" TransferToID="rlbAllowedStations" Height="200px" Skin="Web20" SelectionMode="Multiple" Sort="Ascending" DataKeyField="station_id"
     AutoPostBackOnTransfer="true" Width="250px" OnClientTransferring="onClientTransferring"
    OnTransferred="rlbStations_Transferred"><ButtonSettings ShowDelete="False" ShowReorder="False" /> </telerik:RadListBox>
    <asp:Button Text="Undo" runat="server" OnClientClick="undoChanges()" /><telerik:RadListBox ID="rlbAllowedStations" runat="server" Height="200px" Width="250px" Skin="Web20"> </telerik:RadListBox>
  2. Dimitar Terziev
    Dimitar Terziev avatar
    1266 posts

    Posted 27 Apr 2012 Link to this post

    Hi Caleb,

    Could you please open a support ticket and provide a runnable sample so we could test it locally?

    All the best,
    Dimitar Terziev
    the Telerik team
    If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed now.
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