This API is available on Firefox OS for internal applications only.
Summary
The onsettingchange property lets you set an event handler to be called for all setting changes.
Syntax
SettingsManager.onsettingchange = funcRef;
Where funcRef is a function to be called when a setting state change. This function will receive as input a MozSettingsEvent describing the setting that changed.
Example
// Listen to changes on any settings
navigator.mozSettings.onsettingchange = function (event) {
console.log(event.settingName + ": " + event.settingValue);
};
Specification
Not part of any specification yet; however, this API will be discussed at W3C as part of the System Applications Working Group.