GPS and notification when in background on mobile devices

Hi,
I am planning to create an app on both iOS and Android, and below 2 features/functionality are required
1. the app need to read the monitor the current GPS, even when the app is in the background.
2. the app need to inform user(e.g.  notification/vibration/ring ) even when the app is in the background.
3. the app need to access internet.
Please help to verify whether it is possible, and provide me some online document/resource, I used to play with Flash before.
Thanks in adv.
Regards,
bill

Field calculations are performed using JavaScript.
Starting from Reader for Android 11.2.0, JavaScript support is disabled on Android versions 4.1.x or older.  (Another way of saying is that JavaScript is supported only on Android versions 4.2 or newer.)
Please see the description below in Help > What's New.
If you can update your Android OS to 4.2, field calculations should work again.
We apologize for the inconvenience.  But improved security is our top priority.

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