Adds a single isDirty flag to the viewmodel, that by default subscribes to all non-computed observables automatically.
When dirtyTracker.track is called on a viewmodel an observable is added:
vm.isDirty()
The flag is set to true if any observable property of the viewmodel is changed.
If an observable in the viewmodel should not be tracked, use
ko.observable().extend({ dirtyTracked: false });If a computed observable in the viewmodel should be tracked, use
ko.observable().extend({ dirtyTracked: true });The dirty flag itself is not tracked, so it can be manually be set:
vm.isDirty(false);
To enable tracking simply call:
dirtyTracker.track(vm)before
ko.applyBindings(vm);to enable tracking.
Demo on JSFiddle.net:
http://jsfiddle.net/larsholm/y3t7ku5e/4/