This API is available on Firefox OS for internal applications only.
Summary
The ondatachange property specifies an event listener to receive datachange events. These events occur whenever the MozMobileConnection.data connection object changes values.
Note: MozMobileConnection inherits from the EventTarget interface, so it's also possible to listen for events by using the addEventListener() method.
Syntax
navigator.mozMobileConnection.ondatachange = funcRef;
Where funcRef is a function to be called when the datachange event occurs.
Specification
Not part of any specification.