validation before entering values into database in jsp

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validation before entering values into database in jsp

Hi, my project involves entering data into database from jsp form.but before entering into database it should pop up a alert message that "you have selected product:name and quantity:number". if the the selected product is desired one then it should complete and submit and ebter to database else cancel and get nack to form so that user can change those valyes again.

Please provide the code.

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