combo onChange event

hello



when called the onChange event,How to obtain the original value of the combox?



when click the combox,how to give value for it? because When the focus lossed,Text box shows the selected value.





please help me.

Thank you



How to obtain the original value of the combox?
In moment when onChange event called, old value already replaced with new one, there is no way to access it.

when click the combox,how to give value for it?
There is an onOpen event of combo, which called when combo activated, it can be used to set some initial value