Hello Robert Meyer,
Let me explain to you how Load-On-Demand works – when control is loaded - it has no items. Items are requested when the user types in the input area or clicks on the drop-down toggle image.
So if the RadComboBox dropdown is already populated with data - there will be no new request for items unless user types at RadComboBox input.
However you can have control over requests following these steps:
1. Remove the EnableLoadOnDemand property
" - select - "
2. Handle OnClientDropdownOpening
event and check if there are items loaded at RadComboBox dropdown - if there are no items – you can call client-side requestItems()
function and perform request, otherwise no request will be performed.
items = sender.get_items();
(items.get_count()== 0 )
More details about requestItems()
method you can find here
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