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https://issues.apache.org/jira/browse/CB-12515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15890678#comment-15890678
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Kerri Shotts commented on CB-12515:
-----------------------------------
I just caught on that you're using a third-party JS Library for uploading. ES5
offers no mechanism for changing the internal class property, which is what
using {{Object.prototype.toString.call}} references. As such, when Cordova
creates a File class and then instantiates an object from it, the internal
class remains "Object", and there's no way to override that. ES2015+ has
possibilities, but Cordova must remain compatible with ES5 for now.
I would suggest filing an issue with the third-party plugin indicating that
their type checking fails in this case. Personally, I'd prefer some duck typing
here: that is, check if the passed object has the properties/methods you
expect, and if it does, it's probably a File.
Alternatively, consider using other wrappers that don't rely on this kind of
type checking, or interface with the File & File Transfer plugins directly.
Since there's nothing we can do, I'm closing the issue.
> Object.prototype.toString.call(file) returns [object Object] instead of
> [object File]
> -------------------------------------------------------------------------------------
>
> Key: CB-12515
> URL: https://issues.apache.org/jira/browse/CB-12515
> Project: Apache Cordova
> Issue Type: Bug
> Components: Plugin File
> Reporter: Alexander Broekhuis
>
> I'm trying to use the File plugin in combination with FineUploader.
> FineUploader uses the File API and tests if a passed in object is a file
> using the following call:
> Object.prototype.toString.call(file) === "[object File]"
> But the File retrieved from a FileEntry using entry.file(function(file) { ...
> }); is not seen as a file since the toString.call returns [object Object].
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