How to get old Value with onchange() event in text box

Question

I have a text Box and a Value poplulated in it when page loads. Now If user chanegs any thing in text box, then I want to get the Changed Value(New Value) and Old Value but

Answer 1

element.defaultValue will give you the original value.

Please note that this only works on the initial value.

If you are needing this to persist the "old" value every time it changes, an expando property or similar method will meet your needs