Knockout Dirty Flag

dirtyflag

this.dirtyFlag = ko.dirtyFlag(this);

ko.dirtyFlag = function(root) {
    var _isDirty = ko.observable(false);

    var result = ko.computed(function() {
        if (!_isDirty()) {
            ko.toJS(root); //just for subscriptions
        }

        return _isDirty();
    });

    result.subscribe(function() {
        if (!_isDirty()) {
            _isDirty(true);
        }
    });

    return result;
};