Events
RadDropDownList supports a number of client-side events that let you customize the behavior of the dropdownlist:
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OnClientDropDownOpening occurs before the drop-down list opens.
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OnClientDropDownOpened occurs after the drop-down list has been opened.
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OnClientItemSelecting occurs before the item's selection.
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OnClientItemSelected occurs after the item is selected.
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OnClientSelectedIndexChanged occurs after the SelectedIndex has been changed in response to a user action.
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OnClientDropDownClosing occurs before the drop-down list closes.
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OnClientDropDownClosed occurs after the drop-down has been closed.
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OnClientLoad occurs after the RadDropDownList has been fully initialized on the client-side.
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OnClientItemDataBound occurs for each item that is created during Web Service(including if ODataSource control is used) binding.