On demand load noding animation icon stays visible

[Joe Sixpack]

I have on demand loading of nodes working.  My app is using ASP.NET forms-based authentication.  When the user's ASP.NET session times out (default is 20 minutes) and the user attempts to expand a node then the "loading" animated icon appears and nothing happens.  If the user clicks on something else that actually posts back to the server then ASP.NET displays the login form and the user can resume using the app but the animation icon never disappears.

What can be done about this?

[Yana]

Hello Joe,

You can try using OnClientNodePopulationFailed event  of the treeview in this case. If this doesn't help,  I suggest you use global.asax file and its Session_End event - you can redirect the page in its handler, for example.

Please let us know how it goes.

Greetings,
Yana
the Telerik team

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[DAVE]

I can't get the OnClientNodePopulationFailed method working.  The client-side event never seems to fire.  I'm using the sample from the help:

<script type="text/javascript">
function onClientNodePopulationFailedHandler(sender, eventArgs)
{
var node = eventArgs.get_node();
var errorMessage = eventArgs.get_errorMessage();

alert("Error: " + errorMessage);
eventArgs.set_cancel(true);
}
</script>

<telerik:RadTreeView ID="RadTreeView1"
runat="server"
OnClientNodePopulationFailed="onClientNodePopulationFailedHandler">
....
</telerik:RadTreeView>

I'm using the ServerSide expand mode on my nodes.

How long should it take for this event to be fired?

[Yana]

Hello Dave,

Actually OnClientNodePopulationFailed event is fired only when ExpandMode is set to "ServerSideCallBack" or "WevService", so it is not suitable in your case. Please try the other approach with Session_End event.

Best wishes,
Yana
the Telerik team