I have the following problem with a Telerik RadDropDownList:
Markup:
<asp:UpdatePanel ID="updatepanelInput"runat="server"UpdateMode="Conditional"> <ContentTemplate> <asp:TextBox ID="txtInput"runat="server"ClientIDMode="Static"/> <asp:Button ID="btnSearch"OnClick="btnDoSearch_Click"runat="server"ClientIDMode="Static"/> <telerik:RadDropDownList ID="ddlResults"runat="server"ClientIDMode="Static"DropDownWidth="70%"AutoPostBack="true"OnSelectedIndexChanged="ddlResults_SelectedIndexChanged"/> <telerik:RadDropDownList ID="ddlHistoryDates"runat="server"ClientIDMode="Static"AutoPostBack="true"OnSelectedIndexChanged="ddlHistoryDates_SelectedIndexChanged"/> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="ddlResults"EventName="DataBound"/> </Triggers></asp:UpdatePanel>Code behind:
protectedvoidbtnDoSearch_Click(objectsender, EventArgs e){ AsynchronousQueryExecutor.Call(dataservice.getQuickSearch(currentLan, txtInput.Text, (int)SearchOptions.IncludeInactive), QuickSearchLoaded, LoadFailed); //on query success 'QuickSearchLoaded' will be executed}publicvoidQuickSearchLoaded(List<spData4_QuickSearch_NomenBaseResult> result){ ddlResults.DataSource = result; ddlResults.DataValueField = "id"; ddlResults.DataTextField = "description"; ddlResults.DataBind(); AsynchronousQueryExecutor.Call(dataservice.getHistoryDates(result.FirstOrDefault().id), HistoryDatesLoaded, LoadFailed); //on query success 'HistoryDatesLoaded' is executed}publicvoidHistoryDatesLoaded(List<spData4_Historiek_GetHistoriek_BedragenResult> result){ ddlHistoryDates.DataSource = result; ddlHistoryDates.DataValueField = "DateHistory"; ddlHistoryDates.DataTextField = "Item"; ddlHistoryDates.DataBind();}So basically when btnSearch is clicked a query result should fill ddlResults and based on this result a new query is executed and returning a result which should be filled in ddlHistoryDates. Both query are executed successfully, but only ddlResults is showing data. ddlHistoryDates stays empty.
Calling updatePanelInput.Update() after ddlHistoryDates.DataBind() is giving me the following error:
the update method can only be called on updatepanel with id before render
Anyone who knows what i'm doing wrong?