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Empty text coming on transfer...

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SK
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SK asked on 31 Oct 2012, 05:47 PM
I think I followed all the rules to transfer data between two listboxes but I am getting empty text when transferring from one list box to another...

This is the aspx file
<Telerik:RadListListBox id="lstAvailable" runat="server" allowtransfer="true" transfertoid="lstAllocated"
    width="350px" height="240px" autopostbackontransfer="true" selectionmode="Multiple">
    <HeaderTemplate>
        <div style="text-align: center; background-color: #EEE;">
            <asp:Label ID="lblAvailable" runat="server" Text="Available fields"></asp:Label
        </div>
    </HeaderTemplate>
    <ItemTemplate>
        <div style="width:auto">
            <%#Eval("Text") %>
        </div>
    </ItemTemplate>
<Telerik:RadListListBox>
<Telerik:RadListListBox id="lstAllocated" runat="server" selectionmode="Multiple" allowdelete="False"
    width="350px" height="240px" AllowReorder="True">
    <HeaderTemplate>
        <div style="text-align: center; background-color: #EEE;">
            <asp:Label ID="lblAllocated" runat="server" Text="Used fields"></asp:Label
        </div>
    </HeaderTemplate>
    <ItemTemplate>
        <div style="width:auto">
            <div style="float:left"><%#Eval("Text") %></div>
            <div style="float:Right">
                <asp:CheckBox runat="server" ID="chkRequired" />
            </div>
        </div>
    </ItemTemplate>   
</Telerik:RadListListBox>

This is the cs file

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        LoadFirstListBox();
        LoadSecondListBox();
    }
}
 
protected void LoadFirstListBox()
{
    // Same as LoadSecondListBox (see below)
}
 
protected void LoadSecondListBox()
{
        ListItemCollection lstAllocatedCollection = new ListItemCollection();
            ListItem allocatedItem = new ListItem(
                "Test-1",
                "22");
            allocatedItem.Attributes["Required"] = "true";
            lstAllocatedCollection.Add(allocatedItem);
            allocatedItem = new ListItem(
                "Test-2",
                "33");
            allocatedItem.Attributes["Required"] = "false";
            lstAllocatedCollection.Add(allocatedItem);
            lstAllocated.DataSource = lstAllocatedCollection;
            lstAllocated.DataTextField = "Text";
            lstAllocated.DataValueField = "Value";
            lstAllocated.DataBind();
}
 
void AllocatedListDataBound(object sender, Telerik.Web.UI.RadListBoxItemEventArgs e)
        {
            string checkedValue = (string) DataBinder.Eval(e.Item.DataItem, "Attributes['Required']");
            CheckBox checkBox = (CheckBox)e.Item.FindControl("chkRequired");
            checkBox.Checked = Convert.ToBoolean(checkedValue);
        }
 
void lstAvailable_Transferred(object sender, Telerik.Web.UI.RadListBoxTransferredEventArgs e)
{
            foreach(Telerik.Web.UI.RadListBoxItem item in e.Items)
            {
                item.DataBind(); // Pretty much unnecessary because I am not really changing anything here
            }
}

After transferring an empty text is transferred... see attachment. What am I doing wrong?



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Nencho
Telerik team
answered on 01 Nov 2012, 04:07 PM
Hello SK,

With the usage of the Eval in the markup, you rely on the DataItem in order to evaluate the text, but when a transferred is performed the DataItem do not persist. For that matter, I could suggest you to use the DataBinder in order to evaluate the Text of the transferred Item in a following manner :

<%# DataBinder.Eval(Container, "Text") %>
 
Here you could find detailed explanation on the matter.


Regards,
Nencho
the Telerik team
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Nencho
Telerik team
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