I wonder if I can store data using PhoneGap and Appcellerator both locally and remotely (postgresql in my web application)?
Because it will be a real-time application that should synchronize data between a mobile and a remote server.
yes, you can, with PhoneGap, I am not familiar with Appcellerator.
With PhoneGap you can store in a local database
http://phonegap.pbworks.com/Adding-SQL-Database-support-to-your-iPhone-App
Or you can save to the file system
http://phonegap.pbworks.com/JavaScript-API#file
http://docs.phonegap.com/
PhoneGap Appcellerator, . .
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