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i am making a application for medical store and i want some real time working or calculaltion in php. When a customer name is entered when tab is pressed or scroll down to next text box automatically tells that customer is already added or this name is not available like in this website while registering username option happened. and when one medicine is selected its total amount is automatically calculated and when another medicine is selected automatically added to the bill. and also want to make report to print in php with specific size of customer requirement.