How to Find Control in EditFormSettings \ FormTemplate

[Ron]

I have a combo box and a button inside of a EditFormSettings \ FormTemplate.  In the Items_command event of the grid I trap the buitton click event and I'm tryiong to enable or disable it.

Here is the page code

<

 

telerik:RadGrid ID="RadGrid1" runat="server">

 

 

<HeaderContextMenu EnableTheming="True">

 

 

<CollapseAnimation Type="OutQuint" Duration="200">

 

 

</CollapseAnimation>

 

 

</HeaderContextMenu>

 

 

<MasterTableView CommandItemDisplay="Top" DataKeyNames="Contact_ID" Width="100%"

 

 

ExpandCollapseColumn-Display="true" HierarchyDefaultExpanded="false"

 

 

EditMode="EditForms" AllowPaging="True" PageSize="5">

 

 

<ItemTemplate>

 

 

<span lang="en-us">ITEM TEMPLATE</span>

 

 

</ItemTemplate>

 

 

<RowIndicatorColumn>

 

 

<HeaderStyle Width="20px"></HeaderStyle>

 

 

</RowIndicatorColumn>

 

 

<ExpandCollapseColumn>

 

 

<HeaderStyle Width="20px"></HeaderStyle>

 

 

</ExpandCollapseColumn>

 

 

<EditFormSettings EditFormType="Template">

 

 

<FormTemplate>

 

 

<asp:DropDownList ID="cboCountry" runat="server" Enabled="false">

 

 

</asp:DropDownList>

 

 

<asp:Button runat="server" ID="butCountry" text="change" CausesValidation="False"

 

 

CommandName="ChangeCountry" />

 

 

<br />

 

 

<br />

 

 

</FormTemplate>

 

 

</EditFormSettings>

 

 

</MasterTableView>

 

 

<FilterMenu EnableTheming="True">

 

 

<CollapseAnimation Type="OutQuint" Duration="200">

 

 

</CollapseAnimation>

 

 

</FilterMenu>

 

 

</telerik:RadGrid>

 

and here is the Item_command event in the code behind

 

Private Sub RadGrid1_ItemCommand(ByVal source As Object, ByVal e As Telerik.Web.UI.GridCommandEventArgs) Handles RadGrid1.ItemCommand

 

 

Dim strCommand As String

 

strCommand = e.CommandName.ToUpper

Select

 

Case strCommand

 

 

    Case Is = "CHANGECOUNTRY"

 

 

       Dim editItem As GridDataItem = CType(e.Item, GridDataItem)

 

       Dim

 

ContactCombo As DropDownList = CType(editItem.FindControl("cboCountry"), DropDownList)

 

        ContactCombo.Enable = "True"

 

    End Select

 

 

End Sub

 

Why is it that I can't get a handle to the combo box ?

Any help would be great !

[Princy]

Hello Ron,

You would have to cast the controls in the EditForm as EditFormItem/EditableItem and not as GridDataItem:
vb:

Private Sub RadGrid1_ItemCommand(ByVal source As Object, ByVal e As Telerik.Web.UI.GridCommandEventArgs) Handles RadGrid1.ItemCommand
 Dim strCommand As String strCommand = e.CommandName.ToUpper
  Select Case strCommand
    Case Is = "CHANGECOUNTRY"
         Dim editItem As GridEditFormItem = CType(e.Item, GridEditFormItem)
         Dim ContactCombo As DropDownList = CType(editItem.FindControl("cboCountry"), DropDownList)
         ContactCombo.Enable = "True"
     End Select
End Sub

Thanks
Princy.

[Ron]

Princy

Worked perfectly. You are truly of royalty !

Ron

[ram sagar reddy]

An exception of type 'System.InvalidCastException' occurred in DCSE.iAPECS.Web.UI.dll but was not handled in user code

Additional information: Unable to cast object of type 'Telerik.Web.UI.GridCommandItem' to type 'Telerik.Web.UI.GridEditFormItem'.

[Viktor Tachev]

Hi Ram,

The error you are seeing is caused because you are trying to case a GridCommandItem as GridEditFormItem.

In order to resolve the issue you can add a check for the type of the item:

Protected Sub RadGrid1_ItemCommand(sender As Object, e As GridCommandEventArgs)
    If TypeOf e.Item Is GridEditFormItem Then

        Dim editFormItem As GridEditFormItem = TryCast(e.Item, GridEditFormItem)
    End If
End Sub

Regards,
Viktor Tachev
Telerik