FormTemplate: checkbox (boolean) DataBinding

[Lukasz Kalbarczyk]

Inside my FormTemplate I have:

<asp:CheckBox ID="WidocznaCheckBox" runat="server" Text="Pokazuj w drzewie" CssClass="cbx" Checked='<%#Bind("Widoczna") %>'></asp:CheckBox>

But when I'm trying to add a new record to the RadTreeList, "Specified Cast Is not Valid" is thrown.

Using RadGrid It was possibile to write a small code-snippet:

if ((e.CommandName == RadGrid.InitInsertCommandName))
{
    e.Canceled = true;
    //Prepare an IDictionary with the predefined values
    ListDictionary newValues = new ListDictionary();

    //set initial checked state for the checkbox on init insert
    newValues["Widoczna"] = true

    //Insert the item and rebind
    e.Item.OwnerTableView.InsertItem(newValues);
}

Is there for RatTreeList any similar or equivalent snippet?

Or any other solution?

[Tsvetina]

Hello Lukasz,

You could try using the DefaultInsertValue property of the TreeListCheckBox column:

<telerik:RadTreeList ID="RadTreeList1" runat="server" DataKeyNames="ID" ParentDataKeyNames="ParentID"
    OnNeedDataSource="RadTreeList1_NeedDataSource">
    <Columns>
        <telerik:TreeListEditCommandColumn>
        </telerik:TreeListEditCommandColumn>
        <telerik:TreeListCheckBoxColumn DefaultInsertValue="true" UniqueName="CheckBoxColumn"
            DataField="IsChecked">
        </telerik:TreeListCheckBoxColumn>
    </Columns>
    <EditFormSettings EditFormType="Template">
        <FormTemplate>
            <asp:CheckBox ID="chk" runat="server" Checked='<%#Bind("IsChecked") %>' />
        </FormTemplate>
    </EditFormSettings>
</telerik:RadTreeList>

With the above declaration, the RadTreeList control renders its form template without exceptions.

Regards,
Tsvetina
the Telerik team