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