Event for Server-Side Select All?

[John Horton]

I have a TreeList that allows multiple row selection (server-side) and has a TreeListSelectColumn.  This configuration also creates a checkbox in the header that allows all rows to be selected/deselected.  When an individual row is selected the expected ItemCommand event is triggered on the server-side.  However, when the select-all checkbox in the header is checked and all rows are selected, the subsequent postback does not generate ItemCommand events.  Is there a particular event for this select-all postback? Any recommendations for capturing these selection changes?

<telerik:RadTreeList ID="OrganizationTreeList"
                     runat="server"
                     AllowPaging="True"
                     AllowSorting="True"
                     AllowMultiItemSelection="True"
                     AutoGenerateColumns="false"
                     DataKeyNames="ID"
                     ParentDataKeyNames="ParentID"
                     GridLines="Vertical"
                     OnNeedDataSource="OrganizationTreeList_OnNeedData"
                     OnItemDataBound="OrganizationTreeList_OnItemDataBound"
                     OnItemCommand="OrganizationTreeList_ItemCommand">
    <NoRecordsTemplate>
        There are no organizations to display.
    </NoRecordsTemplate>
    <Columns>
        <telerik:TreeListSelectColumn UniqueName="SelectColumn" HeaderStyle-Width="5%"  />
        <telerik:TreeListBoundColumn DataField="ID"
                                     HeaderText="ID"
                                     UniqueName="ID"
                                     HeaderStyle-Width="80px"
                                     HeaderStyle-HorizontalAlign="Center"
                                     ItemStyle-HorizontalAlign="Center" />
        <telerik:TreeListCheckBoxColumn DataField="IsActive"
                                        HeaderText="Active"
                                        UniqueName="IsActive"
                                        HeaderStyle-Width="55px"
                                        HeaderStyle-HorizontalAlign="Center"
                                        ItemStyle-HorizontalAlign="Center" />
        <telerik:TreeListBoundColumn DataField="Name"
                                     HeaderText="Name"
                                     UniqueName="Name"
                                     HeaderStyle-Width="68%" />
    </Columns>
    <PagerStyle Mode="NextPrevAndNumeric"  />
</telerik:RadTreeList>

[Marin]

Hello John,

We confirm that the ItemCommand event does not fire in this case. The issue has been forwarded to our development team for further investigation.
A temporary workaround would be to attach a client function to the onclick event of the checkbox in the header that fires a command and raises postback on the server. Here is a sample code:

protected void Page_PreRender(object sender, EventArgs e)
       {
           TreeListItem headerItem = RadTreeList1.GetItems(new TreeListItemType[] { TreeListItemType.HeaderItem })[0];
           (headerItem.Cells[0].Controls[0] as CheckBox).Attributes["onclick"] = "raiseSelect();";
       }

function raiseSelect()
            {
                var treelist = $find("<%= RadTreeList1.ClientID %>");
                treelist.fireCommand("Select","0");
                //note that this will simulate raising an item command event as if the first data item has been selected
            }

Feel free to contact us again if you have any other questions.

Greetings,
Marin
the Telerik team