DirtyFlag

DirtyFlag

define(['ko'], function(ko) {
    //    (function (ko) {
    ko.DirtyFlag = function (objectToTrack, isInitiallyDirty, hashFunction) {

        hashFunction = hashFunction || ko.toJSON;

        var
            _objectToTrack = objectToTrack,
            _lastCleanState = ko.observable(hashFunction(_objectToTrack)),
            _isInitiallyDirty = ko.observable(isInitiallyDirty),

            result = function () {
                var self = this;

                self.isDirty = ko.computed(function () {
                    return _isInitiallyDirty() || hashFunction(_objectToTrack) !== _lastCleanState();
                });

                self.reset = function () {
                    _lastCleanState(hashFunction(_objectToTrack));
                    _isInitiallyDirty(false);
                };

                return self;
            };
            
        return result;
    };

//}(ko));
});