How Set Client-Side Selected Value from DropDownList Using the CascadingDropDown

L'altro giorno mi sono imbattuto in questo piccolo problemino...
Beh, non so se questo è il modo corretto .... ma funziona!

    1     // set default value

    2     function setSelectedIndex(_control, _value) {

    3         for ( var i = 0; i < _control.options.length; i++ ) {

    4             if ( _control.options[i].value == _value ) {

    5                 _control.options[i].selected = true;

    6                 return;

    7             }

    8         }

    9     }

   10     // Load Data From DB

   11     function LoadData()

   12     {

   13         GetWebServiceProxy().GetDataFromDB(key, LoadSuccess, LoadFail, key);

   14     }

   15     // Binding Data   

   16     function LoadSuccess(result, userContext, methodName)

   17     {

   18         // set the Parent value   

   19         setSelectedIndex( $get(ddlParent), result.parentValue ); 

   20         // set the Child value

   21         $find("bIDChild").set_contextKey( result.parentValue ); 

   22         $find("bIDChild")._onParentChange( null, false );

   23         $find("bIDChild").set_SelectedValue( result.childValue, result.childValue );

   24     }

   25 

   26     // Raise Error

   27     function LoadFail(result, userContext, methodName)

   28     {

   29         alert('[LoadData] method fail.');

   30     }   

   31 </script>

   32 

   33 <div>

   34     <asp:DropDownList ID="ddlParent" runat="server">

   35     </asp:DropDownList>

   36     <ajaxToolkit:CascadingDropDown ID="cdParent" runat="server" TargetControlID="ddlParent"

   37         Category="Parent" PromptText="Please select an Parent" LoadingText="[Loading Parent...]"

   38         ServicePath="myWebServices.asmx" ServiceMethod="myWebMethod" BehaviorID="bIDParent" />

   39     <asp:DropDownList ID="ddlChild" runat="server">

   40     </asp:DropDownList>

   41     <ajaxToolkit:CascadingDropDown ID="cdChild" runat="server" TargetControlID="ddlChild"

   42         Category="Child" PromptText="Please select an Child" LoadingText="[Loading Child...]"

   43         ServicePath="myWebServices.asmx" ServiceMethod="myWebMethod" BehaviorID="bIDChild"

   44         ParentControlID="ddlParent" />

   45 </div>