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Using FormTemplate/UserControl

This article will show you how you can retrieve the values from FormTemplate and WebUserControl edit forms on insert command. You can afterwards use them to perform your own inserting logic to your treelist datasource.

Inserting values using FormTemplate

The main logic here lies on using the FindControl(controlID) method - once you obtain a reference to the TreeListEditFormInsertItem you can easily access the controls in it by ID.

<telerik:RadTreeList RenderMode="Lightweight" ID="RadTreeList1" runat="server" DataKeyNames="EmployeeID" ParentDataKeyNames="ReportsTo"
    AutoGenerateColumns="false" EditMode="EditForms" DataSourceID="SqlDataSource1"
    OnInsertCommand="RadTreeList1_InsertCommand">
    <Columns>
        <telerik:TreeListBoundColumn DataField="EmployeeID" HeaderText="EmployeeID" 
        UniqueName="EmployeeID" ReadOnly="true" />
        <telerik:TreeListBoundColumn DataField="LastName" HeaderText="LastName" 
        UniqueName="LastName" />
        <telerik:TreeListBoundColumn DataField="FirstName" HeaderText="FirstName" 
        UniqueName="FirstName" />
        <telerik:TreeListBoundColumn DataField="HomePhone" HeaderText="HomePhone" 
        UniqueName="HomePhone" />
        <telerik:TreeListDateTimeColumn DataField="HireDate" HeaderText="HireDate" 
        UniqueName="HireDate" />
        <telerik:TreeListBoundColumn DataField="ReportsTo" HeaderText="ReportsTo" 
        UniqueName="ReportsTo" ReadOnly="true" />
        <telerik:TreeListEditCommandColumn UniqueName="EditColumn" />
    </Columns>
    <EditFormSettings EditFormType="Template">
            <FormTemplate>
                <table>
                    <tr>
                        <td>
                            FirstName:
                        </td>
                        <td>
                            <asp:TextBox ID="TextBox1" Text='<%# Bind("FirstName") %>' runat="server">
                            </asp:TextBox>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            Last Name:
                        </td>
                        <td>
                            <asp:TextBox ID="TextBox2" Text='<%# Bind("LastName") %>' runat="server">
                            </asp:TextBox>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            Home Phone:
                        </td>
                        <td>
                            <telerik:RadMaskedTextBox RenderMode="Lightweight" ID="RadMaskedTextBox1" runat="server" SelectionOnFocus="SelectAll"
                                TextWithLiterals='<%# Bind("HomePhone") %>'  Mask="(###) ###-####">
                            </telerik:RadMaskedTextBox>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            Hire Date:
                        </td>
                        <td>
                            <telerik:RadDatePicker RenderMode="Lightweight" ID="RadDatePicker1" DbSelectedDate='<%# Bind("HireDate") %>'
                                runat="server">
                            </telerik:RadDatePicker>
                        </td>
                    </tr>
                </table>
                <asp:Button ID="btnUpdate" Text="Insert"
                    runat="server" CommandName="PerformInsert">
                </asp:Button>&nbsp;
                <asp:Button ID="btnCancel" Text="Cancel" runat="server" CausesValidation="False"
                    CommandName="Cancel"></asp:Button>
            </FormTemplate>
        </EditEormSettings>
</telerik:RadTreeList>
protected void RadTreeList1_InsertCommand(object sender, Telerik.Web.UI.TreeListCommandEventArgs e)
{
    //Canceling the automatic datasource operation
    e.Canceled = true;

    //Extracting the values from the form template edit form using the FindControl() method
    TreeListEditFormInsertItem insertedItem = e.Item as TreeListEditFormInsertItem;
    string firstName = (insertedItem.FindControl("TextBox1") as TextBox).Text;
    string lastName = (insertedItem.FindControl("TextBox2") as TextBox).Text;
    string homePhone = (insertedItem.FindControl("RadMaskedTextBox1") as RadMaskedTextBox).TextWithLiterals;
    DateTime? hireDate = (insertedItem.FindControl("RadDatePicker1") as RadDatePicker).SelectedDate;

    //Inserting logic follows, this part depends on your own custom way of performing CRUD operations
    SqlDataSource1.InsertParameters["FirstName"].DefaultValue = firstName;
    SqlDataSource1.InsertParameters["LastName"].DefaultValue = lastName;
    SqlDataSource1.InsertParameters["HomePhone"].DefaultValue = homePhone;
    SqlDataSource1.InsertParameters["HireDate"].DefaultValue = hireDate.ToString();
    SqlDataSource1.Insert();

    //Closing the insert form and rebinding the treelist control
    RadTreeList1.InsertIndexes.Clear();
    RadTreeList1.Rebind();
}
Protected Sub RadTreeList1_InsertCommand(ByVal sender As Object, ByVal e As Telerik.Web.UI.TreeListCommandEventArgs)
    'Canceling the automatic datasource operation
    e.Canceled = True

    'Extracting the values from the form template edit form using the FindControl() method
    Dim insertedItem As TreeListEditFormInsertItem = TryCast(e.Item, TreeListEditFormInsertItem)
    Dim firstName As String = TryCast(insertedItem.FindControl("TextBox1"), TextBox).Text
    Dim lastName As String = TryCast(insertedItem.FindControl("TextBox2"), TextBox).Text
    Dim homePhone As String = TryCast(insertedItem.FindControl("RadMaskedTextBox1"), RadMaskedTextBox).TextWithLiterals
    Dim hireDate As System.Nullable(Of DateTime) = TryCast(insertedItem.FindControl("RadDatePicker1"), RadDatePicker).SelectedDate

    'Inserting logic follows, this part depends on your own custom way of performing CRUD operations
    SqlDataSource1.InsertParameters("FirstName").DefaultValue = firstName
    SqlDataSource1.InsertParameters("LastName").DefaultValue = lastName
    SqlDataSource1.InsertParameters("HomePhone").DefaultValue = homePhone
    SqlDataSource1.InsertParameters("HireDate").DefaultValue = hireDate.ToString()
    SqlDataSource1.Insert()

    'Closing the insert form and rebinding the treelist control
    RadTreeList1.InsertIndexes.Clear()
    RadTreeList1.Rebind()
End Sub

Inserting values using WebUserControl

The approach here would be similar to when using FormTemplate. The difference is the way you access the user control.

Here is sample code for extracting the values from the user control on InsertCommand event of RadTreeList:

<telerik:RadTreeList RenderMode="Lightweight" ID="RadTreeList2" runat="server" DataKeyNames="EmployeeID" ParentDataKeyNames="ReportsTo"
    AutoGenerateColumns="false" EditMode="EditForms" DataSourceID="SqlDataSource1"
    OnInsertCommand="RadTreeList2_InsertCommand">
    <editformsettings editformtype="WebUserControl" usercontrolpath="~/WebUserControl.ascx">
<Columns>
    <telerik:TreeListBoundColumn DataField="EmployeeID" HeaderText="EmployeeID" UniqueName="EmployeeID"
        ReadOnly="true" />
    <telerik:TreeListBoundColumn DataField="LastName" HeaderText="LastName" UniqueName="LastName" />
    <telerik:TreeListBoundColumn DataField="FirstName" HeaderText="FirstName" UniqueName="FirstName" />
    <telerik:TreeListBoundColumn DataField="HomePhone" HeaderText="HomePhone" UniqueName="HomePhone" />
    <telerik:TreeListDateTimeColumn DataField="HireDate" HeaderText="HireDate" UniqueName="HireDate" />
    <telerik:TreeListBoundColumn DataField="ReportsTo" HeaderText="ReportsTo" UniqueName="ReportsTo" ReadOnly="true" />
    <telerik:TreeListEditCommandColumn UniqueName="EditColumn" />
</Columns>
</editformsettings>
</telerik:RadTreeList>
protected void RadTreeList2_InsertCommand(object sender, Telerik.Web.UI.TreeListCommandEventArgs e)
{
    //Canceling the automatic datasource operation
    e.Canceled = true;

    //Extracting the values from the form template edit form using the FindControl() method
    TreeListEditFormInsertItem insertedItem = e.Item as TreeListEditFormInsertItem;
    UserControl userControl = (UserControl)insertedItem.FindControl(GridEditFormInsertItem.EditFormUserControlID);
    string firstName = (userControl.FindControl("TextBox1") as TextBox).Text;
    string lastName = (userControl.FindControl("TextBox2") as TextBox).Text;
    string homePhone = (userControl.FindControl("RadMaskedTextBox1") as RadMaskedTextBox).TextWithLiterals;
    DateTime? hireDate = (userControl.FindControl("RadDatePicker1") as RadDatePicker).SelectedDate;
    string reportsTo = (userControl.FindControl("TextBox3") as TextBox).Text;

    //Inserting logic follows, this part depends on your own custom way of performing CRUD operations
    SqlDataSource1.InsertParameters["FirstName"].DefaultValue = firstName;
    SqlDataSource1.InsertParameters["LastName"].DefaultValue = lastName;
    SqlDataSource1.InsertParameters["HomePhone"].DefaultValue = homePhone;
    SqlDataSource1.InsertParameters["HireDate"].DefaultValue = hireDate.ToString();
    SqlDataSource1.InsertParameters["ReportsTo"].DefaultValue = reportsTo;
    SqlDataSource1.Insert();

    //Closing the insert form and rebinding the treelist control
    RadTreeList1.InsertIndexes.Clear();
    RadTreeList1.Rebind();
}
Protected Sub RadTreeList2_InsertCommand(ByVal sender As Object, ByVal e As Telerik.Web.UI.TreeListCommandEventArgs)
    'Canceling the automatic datasource operation
    e.Canceled = True

    'Extracting the values from the form template edit form using the FindControl() method
    Dim insertedItem As TreeListEditFormInsertItem = TryCast(e.Item, TreeListEditFormInsertItem)
    Dim userControl As UserControl = DirectCast(insertedItem.FindControl(GridEditFormInsertItem.EditFormUserControlID), UserControl)
    Dim firstName As String = TryCast(userControl.FindControl("TextBox1"), TextBox).Text
    Dim lastName As String = TryCast(userControl.FindControl("TextBox2"), TextBox).Text
    Dim homePhone As String = TryCast(userControl.FindControl("RadMaskedTextBox1"), RadMaskedTextBox).TextWithLiterals
    Dim hireDate As System.Nullable(Of DateTime) = TryCast(userControl.FindControl("RadDatePicker1"), RadDatePicker).SelectedDate
    Dim reportsTo As String = TryCast(userControl.FindControl("TextBox3"), TextBox).Text

    'Inserting logic follows, this part depends on your own custom way of performing CRUD operations
    SqlDataSource1.InsertParameters("FirstName").DefaultValue = firstName
    SqlDataSource1.InsertParameters("LastName").DefaultValue = lastName
    SqlDataSource1.InsertParameters("HomePhone").DefaultValue = homePhone
    SqlDataSource1.InsertParameters("HireDate").DefaultValue = hireDate.ToString()
    SqlDataSource1.InsertParameters("ReportsTo").DefaultValue = reportsTo
    SqlDataSource1.Insert()

    'Closing the insert form and rebinding the treelist control
    RadTreeList2.InsertIndexes.Clear()
    RadTreeList2.Rebind()
End Sub

Additionally, if you want the treelist to be able to extract values from the user control, the latter needs to implement the IBindable interface.Here follows a sample implementation:

<table>
    <tr>
        <td>
            FirstName:
        </td>
        <td>
            <asp:TextBox ID="TextBox1" Text='<%# DataBinder.Eval( Container, "DataItem.FirstName") %>'
                runat="server">
            </asp:TextBox>
        </td>
    </tr>
    <tr>
        <td>
            Last Name:
        </td>
        <td>
            <asp:TextBox ID="TextBox2" Text='<%# DataBinder.Eval( Container, "DataItem.LastName") %>'
                runat="server">
            </asp:TextBox>
        </td>
    </tr>
    <tr>
        <td>
            Home Phone:
        </td>
        <td>
            <telerik:RadMaskedTextBox RenderMode="Lightweight" ID="RadMaskedTextBox1" runat="server" SelectionOnFocus="SelectAll"
                TextWithLiterals='<%# DataBinder.Eval( Container, "DataItem.HomePhone") %>' Mask="(###) ###-####">
            </telerik:RadMaskedTextBox>
        </td>
    </tr>
    <tr>
        <td>
            Hire Date:
        </td>
        <td>
            <telerik:RadDatePicker RenderMode="Lightweight" ID="RadDatePicker1" DbSelectedDate='<%# DataBinder.Eval( Container, "DataItem.HireDate") %>'
                runat="server">
            </telerik:RadDatePicker>
        </td>
    </tr>
</table>
<asp:Button ID="btnUpdate" Text="Insert" runat="server" CommandName="PerformInsert"
</asp:Button>&nbsp;
<asp:Button ID="btnCancel" Text="Cancel" runat="server" CausesValidation="False"
    CommandName="Cancel"></asp:Button>
public partial class WebUserControl : System.Web.UI.UserControl, IBindableControl
{
    public void ExtractValues(IOrderedDictionary dictionary)
   {
       //retrives all RadInputs and add thier values to the dictionary
       foreach (var input in Controls.OfType<RadInputControl>().Select(control => new {FieldName = control.ID, FieldValue = control.Text}))
       {
           dictionary.Add(input.FieldName, input.FieldValue);
       }
   }
   public object DataItem { get; set; }

}
Partial Class WebUserControlVB
    Inherits System.Web.UI.UserControl
    Implements IBindableControl
    Public Sub ExtractValues(ByVal dictionary As System.Collections.Specialized.IOrderedDictionary) Implements System.Web.UI.IBindableControl.ExtractValues
        For Each i In Controls.OfType(Of RadInputControl)().Select(Function(control) New With {.FieldName = control.ID, .FieldValue = control.Text})
            dictionary.Add(i.FieldName, i.FieldValue)
        Next
    End Sub
    Private dtItem As Object
    Public Property DataItem() As Object
        Get
            Return dtItem
        End Get
        Set(ByVal value As Object)
            dtItem = value
        End Set
    End Property

End Class
caution

Note that RadTreeList expects the newly inserted value of the field that is specified as DataKeyNames to be larger than any of the already available values of this field in the datasource.