Description:
The onhide property is an event handler for the event of when a widget is switching from the foreground to the background. In other words, when a running widget loses focus, the assigned callback function will be called.
This property is useful for managing the functionality of the widget in relation to other applications on the device.
Syntax:
[void] window.widget.onhide = function() { }
or
[void] window.widget.onhide = toBackground;
function toBackground()
{
// ...
}