Conditional Row Select in Hierarchy

If you have client-side selection enabled in a hierarchical grid with a master table and one detail table, you might want to allow users to select rows at the detail level, but not the master level. To accomplish this:

1. Add a handler for the grid's client-side RowSelecting event.

2. In the event handler, call the get_tableView() method of the event arguments to access the current table view

3. Check whether the current table view is the master table, and if so, call set_cancel(true) to prevent the selection.

To determine whether the current table view is the master table,

1. When you create the grid, set the Name property of the MasterTableView and detail GridTableView objects.

2. In the event handler, use the get_name() method of the client-side object to access the name of the table.

This approach can be extended to a grid with more levels of hierarchy as well.

ASP.NET

<script type="text/javascript">
  function RowSelecting(sender, eventArgs) {
    //eventArgs.get_tableView() returns the
    gridtable
    //from which the event originated
    if (eventArgs.get_tableView().get_name() == "Customers") {
      eventArgs.set_cancel(true);
    }
  }
</script>
<telerik:RadGrid RenderMode="Lightweight" ID="RadGrid1" runat="server" AllowMultiRowSelection="False" DataSourceID="SqlDataSource1">
  <MasterTableView DataSourceID="SqlDataSource1" DataKeyNames="CustomerID" AllowPaging="True"
    PageSize="3" AllowSorting="True" Width="100%" Name="Customers">
    <DetailTables>
      <telerik:GridTableView DataSourceID="SqlDataSource2" DataKeyNames="OrderID" AllowPaging="True"
        PageSize="4" AllowSorting="True" Width="100%" Name="Orders">
        <ParentTableRelation>
          <telerik:GridRelationFields DetailKeyField="CustomerID" MasterKeyField="CustomerID">
          </telerik:GridRelationFields>
        </ParentTableRelation>
      </telerik:GridTableView>
    </DetailTables>
  </MasterTableView>
  <ClientSettings>
    <Selecting AllowRowSelect="True" />
    <ClientEvents OnRowSelecting="RowSelecting" />
  </ClientSettings>
</telerik:RadGrid>
<asp:SqlDataSource ID="SqlDataSource1" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
    ProviderName="System.Data.SqlClient" SelectCommand="SELECT * FROM Customers"
    runat="server">
</asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDataSource2" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
    ProviderName="System.Data.SqlClient" SelectCommand="SELECT * FROM Orders Where CustomerID = @CustomerID"
    runat="server">
    <SelectParameters>
        <asp:Parameter Name="CustomerID" SessionField="CustomerID" Type="string" />
    </SelectParameters>
</asp:SqlDataSource>