449880 - Implement mediaType for File object

Status: NEW

(Core :: DOM: Core & HTML, defect, P5)

Description

[Garrett Smith]

Attachment: Test Case Showing Problem

The File object is implemented in Firefox 3. 

It is currently a Working Draft:
 http://www.w3.org/TR/file-upload/
 http://dev.w3.org/2006/webapi/FileUpload/publish/FileUpload.html

Implemented differently in Firefox 3.
 http://developer.mozilla.org/en/docs/nsIDOMFile
 https://bugzilla.mozilla.org/show_bug.cgi?id=371432

The Firefox implementation should include a way to detect the mime-type, but doesn't. 

The File Upload WD includes a mediaType property of a File object.

http://www.w3.org/TR/file-upload/ 
Working Draft:

| File
|  readonly attribute DOMString      fileName;
|  readonly attribute DOMString      mediaType;
|  readonly attribute unsigned long  fileSize;
|  DOMString          getDataAsString()
|                                      raises(FileException);
|  DOMString          getDataAsBase64()
|                                      raises(FileException);
|  DOMString          getDataAsHexBinary()
`------------------------------------------------------------

Notice that the methods are also different/differently named in Firefox. 

Firefox 3:
| File
|   fileName
|   fileSize
|
|   getAsBinary()
|   getAsDataURL()
|   getAsText()
`------------------------------------------------------------

Having a mediaType can allow for faster notification of user errors. For example, for applications that wish to check to see if a file is a jpeg or png could do so without sending the (possibly large) file to the server.

Comment 1

[Jonas Sicking (:sicking) No longer reading bugmail consistently]

I don't think we care about the fact that it differs from the 'spec' since it's a draft spec that seems to have died. But the use-case of being able to notify early seems useful though.

Comment 2

[Firefox Bug Husbandry Bot]

https://bugzilla.mozilla.org/show_bug.cgi?id=1472046

Move all DOM bugs that haven’t been updated in more than 3 years and has no one currently assigned to P5.

If you have questions, please contact :mdaly.