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Angular.js Illegal call to the copied File object

Well, there's really nothing to explain. https://jsbin.com/raqajelufu/edit?html,js,output An exception to the illegal call exception occurs when you access the properties of a File object after copying using angular.copy.

Is there a workaround that would force me to watch the File object, given that $ watch uses angular.copy internally in accordance with https://docs.angularjs.org/api/ng/type/$rootScope.Scope ?

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javascript angularjs angularjs-scope
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Which browser do you see the problem?

A similar question was asked some time ago, which came to the conclusion that this may be relevant to Chrome v43.

Some resources related to the problem:

Presumably, Chrome v43 does not do the following in angular.copy source :

 var emptyObject = Object.create(Object.getPrototypeOf(source));

You can try any of the following to make sure that it suppresses your errors (regardless of your browser):

  • Do not use angular.copy , avoiding the deep hours a la $scope.$watch('', fn, true) ( jsbin ) and move on to something like _. cloneDeep ( jsbin ) from lodash when you need to make a deep copy of something.
  • Return to Chrome v42 (if you're on v43).
  • Return to Angular 1.2.28, where angular.copy does not call the line above. source ( jsbin )

If you want to watch carefully, but avoid angular.copy , I would do something like this (using lodash.merge ):

 $scope.$watch(function () { return _.merge(src, dest); }, callback);

another jsbin

This way you will not name angular.copy , and you will still have a "deep view" setting. In my opinion, this is a very naive example, and I have not tested it completely, but I think you can make it look very much like an Angular deep watch with minimal effort.

Disclaimer: I really didn’t dig this deep into what is actually happening in the source of angular.copy , console and / or Chrome v43. This is a slightly gray area, but with the above suggestions I have not yet caused an illegal call.

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