OnClientItemPopulating
The OnClientItemPopulating client-side event occurs when the menu is about to call a Web service to populate the child items of an item with ExpandMode set to "WebService".
The event handler receives two parameters:
The instance of the menu firing the event.
An eventArgs parameter containing the following methods:
get_item returns a reference to the RadMenuItem whose child items are about be populated from the Web service.
set_cancel lets you prevent the call to the Web service.
get_cancel returns a boolean value indicating whether the call to the Web service was canceled.
get_context returns a reference to an IDictionary object that can be used to pass context information to the Web service.
get_domEvent returns a reference to the DOM event.
You can use this event to conditionally cancel the call to fetch items or to pass context information to the Web service before the call:
<script type="text/javascript">
function itemPopulating(sender, eventArgs) {
var item = eventArgs.get_item();
var context = eventArgs.get_context();
context["CategoryID"] = item.get_value();
}
</script>
<telerik:RadMenu RenderMode="Lightweight" ID="RadMenu1" runat="server" Skin="Default" OnClientItemPopulating="itemPopulating">
<WebServiceSettings Path="ProductCategories.asmx" Method="GetMenuCategories" />
<LoadingStatusTemplate>
<asp:Image runat="server" ID="LoadingImage" ImageUrl="~/Ajax/Img/loading7.gif" ToolTip="Loading..."
Width="81px" Height="21px" />
</LoadingStatusTemplate>
<Items>
<telerik:RadMenuItem Text="Products" Value="1" ExpandMode="WebService">
</telerik:RadMenuItem>
<telerik:RadMenuItem Text="Purchase" Value="132" ExpandMode="WebService">
</telerik:RadMenuItem>
<telerik:RadMenuItem Text="Support" Value="141" ExpandMode="WebService">
</telerik:RadMenuItem>
<telerik:RadMenuItem Text="Community" Value="155" ExpandMode="WebService">
</telerik:RadMenuItem>
<telerik:RadMenuItem Text="Corporate" Value="164" ExpandMode="WebService">
</telerik:RadMenuItem>
</Items>
</telerik:RadMenu>