[Solved] dropdownlist within radajaxpanel performing full page postback sometimes

[FL-Developer]

Seems to do async half of the time, full the other half.

I'm not having the best luck with Prometheus so far.  Every (simple)scenario I have tested it in has failed in one way or another.

<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Height="75px"

Width="75px">

<asp:Image ID="Image1" runat="server" AlternateText="Loading..." ImageUrl="~/RadControls/Ajax/Skins/Default/Loading.gif" />

</telerik:RadAjaxLoadingPanel>

<telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" LoadingPanelID="RadAjaxLoadingPanel1">

<label>Template</label>

<asp:DropDownList ID="ddTemplates" runat="server"

DataTextField="description" DataValueField="templateid"

OnSelectedIndexChanged="ddTemplates_Changed" AutoPostBack="true">

</asp:DropDownList>

<label>Template Slots</label>

<radG:RadGrid ID="rgTemplateSlots" runat="server" OnNeedDataSource="rgTemplateSlots_NeedDataSource">

<MasterTableView DataKeyNames="TemplateSlotId" AutoGenerateColumns="false">

<Columns>

<radG:GridEditCommandColumn ItemStyle-CssClass="img" ButtonType="ImageButton"

EditImageUrl="~/Images/Edit.gif">

</radG:GridEditCommandColumn>

<radG:GridBoundColumn HeaderText="Shortcut" DataField="Shortcut"></radG:GridBoundColumn>

</Columns>

<EditFormSettings EditFormType="Template" CaptionDataField="shortcut" CaptionFormatString="Editing {0}">

<FormStyle BackColor="White" />

<FormTemplate>

<radE:RadEditor ID="txtSlot" runat="server"

DocumentsFilters="*.pdf,*.doc"

ImagesFilters="*.gif,*.jpg,*.bmp,*.png"

Html='<%#Eval("Markup") %>'

</radE:RadEditor>

</FormTemplate>

</EditFormSettings>

</MasterTableView>

</radG:RadGrid>

</telerik:RadAjaxPanel>

[surfer]

A bit weird, since the Prmetheus AjaxManager/Panel is based on MS UpdatePanel, which is working fine with all telerik controls.

Can you try replacing the RadAjaxPanel control with asp:UpdatePanel and see if the same problems persists? If this is the case, then we will at least know the problem is related to how telerik controls interact with UpdatePanel and not directly to RadAjaxManager/Panel...

[FL-Developer]

Sure, no problem.

I tested it, and the same markup within UpdatePanel works well, performing async postback every time.

[Jason Maronge]

Do you happen to have the following setting set in your web.config?

<pages enableEventValidation="false">

If so, I have a thread on this issue.  telerik is looking it to it.

Jason

[FL-Developer]

Great find.  In fact I did not have this set at the web.config level, but I did have it set on the particular page in question.  Thanks.