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problem in interface between nfc reader and web application

 
ahmed mego
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this code make interface between nfc reader and my web application any way i have value of nfc card (id) in the void method and i want to get it again i know that void return null but there are not any solutions for that . I tried to declare id as global variable but i have null

i want to get the value of id again


my output : null

please help me and thank you in advanve
 
Ulf Dittmer
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Out of curiosity: what good does it do to connect a web app to an NFC reader? What devices might be in the vicinity of a web server?
 
ahmed mego
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i use aurdino uno this not important i want only know how i can get value of id from void method donot worry about all code i only need to get value of id there any solution for that
 
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