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POCorruption with FileReader into FormData
primarykey
Id
7211902
data
AcceptedAnswerId
7215096
AnswerCount
2
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2011-08-27T01:07:20.280
FavoriteCount
1
LastActivityDate
2011-09-03T06:56:58.043
LastEditDate
2011-08-28T17:47:59.190
LastEditorUserId
131023
OwnerUserId
131023
ParentId
0
PostTypeId
1
Score
1
ViewCount
1994
LastEditorDisplayName
text
Body
<p>I'm building an ajax file uploader, which is possible thanks to the new <a href="https://developer.mozilla.org/en/DOM/XMLHttpRequest/FormData" rel="nofollow">FormData</a> interface. It works if I use the original file, but if I convert the file to a binary string and then to a blob, the resulting file is corrupted. What am I doing wrong?</p> <pre><code><!DOCTYPE html> <html> <body> <form method=post enctype=multipart/form-data id=form> <input id=file type=file name=file> <button id=1>1</button> <button id=2>2</button> </form> <script> var d = document; function $(id) { return d.getElementById(id); }; function xhr(fd) { var x = new XMLHttpRequest(); x.open('post', '/', true); x.send(fd); }; $(1).addEventListener('click', function(e) { e.preventDefault(); var file = $('file').files[0]; var fd = new FormData(); fd.append('file', file); xhr(fd); }, false ); $(2).addEventListener('click', function(e) { e.preventDefault(); var file = $('file').files[0]; var fr = new FileReader(); fr.onload = function(e) { var bb = new (window.BlobBuilder || window.MozBlobBuilder || window.WebKitBlobBuilder)() bb.append(e.target.result); var b = bb.getBlob(file.type); var fd = new FormData(); fd.append('file', b); xhr(fd); }; fr.readAsBinaryString(file); }, false ); </script> </body> </html> </code></pre> <p><a href="https://developer.mozilla.org/en/DOM/Blob" rel="nofollow">Blob</a> <a href="https://developer.mozilla.org/en/DOM/BlobBuilder" rel="nofollow">BlobBuilder</a> <a href="https://developer.mozilla.org/en/DOM/FileReader" rel="nofollow">FileReader</a> <a href="https://developer.mozilla.org/en/DOM/XMLHttpRequest/FormData" rel="nofollow">FormData</a></p> <p>edited to include links</p>
Tags
<javascript><ajax><html5>
Title
Corruption with FileReader into FormData
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PostAcceptedAnswerId
1. PO
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1. PTQuestion
UserLastEditorUserId
1. USaeosynth
UserOwnerUserId
1. USaeosynth
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1. PO
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