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Sathish David Kumar NFlag for India

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how to get previous values while do on change in dropdown

how to get previous values while do on change in dropdown

eg:
in my drop down i selected as 4  then i going to change the drop down to 5
i want to get previous values (4) also .

some condition the new value is duplicate then i need to set the old (previous ) value
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vr6r

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