Modified track changes knockout extended that can handle detection of changes to complex objects
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var traverseObservables = function (obj, action) { | |
ko.utils.arrayForEach(getObjProperties(obj), function (observable) { | |
if (observable && observable.value && !observable.value.nodeType && ko.isObservable(observable.value)) { | |
action(observable); | |
} | |
}); | |
}; | |
ko.extenders.trackChange = function (target, track) { | |
if (track) { | |
target.hasValueChanged = ko.observable(false); | |
target.hasDirtyProperties = ko.observable(false); | |
target.isDirty = ko.computed(function () { | |
return target.hasValueChanged() || target.hasDirtyProperties(); | |
}); | |
var unwrapped = target(); | |
if ((typeof unwrapped == "object") && (unwrapped !== null)) { | |
traverseObservables(unwrapped, function (obj) { | |
applyChangeTrackingToObservable(obj.value); | |
obj.value.isDirty.subscribe(function (isdirty) { | |
if (isdirty) target.hasDirtyProperties(true); | |
}); | |
}); | |
} | |
target.originalValue = target(); | |
target.subscribe(function (newValue) { | |
// use != not !== so numbers will equate naturally | |
target.hasValueChanged(newValue != target.originalValue); | |
target.hasValueChanged.valueHasMutated(); | |
}); | |
} | |
return target; | |
}; |
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