Since the iframe is redirecting to a new page, the initiated load of the form is not a postback, but rather an entirely new page load. Therefore, RadAjaxLoadingPanel
simply does not have a created control to be applied on, thus, this scenario is not supported.
One possible approach to achieve the desired functionality is to use a RadWindow
set to false
as demonstrated in the following demo:
Window / Show Content During Load
Please note that you could remove the extra styling of RadWindow
and display it as a regular iframe.
An alternative approach would be to try showing the loading panel explicitly
. You could initiate the loading over a given panel on user node click and then end it when the iframe completely loads its page using the onload event of the iframe:
I believe this will prove helpful.
the Telerik team
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