update: i've removes this part of the code: var targetInput = $('my_upload'); if(targetInput) { new XWiki.FileUploader(targetInput, { autoUpload: true, progressAutohide: true }); } and all, that is left: {{html}} <form action="{{velocity}}${doc.getURL('upload')}{{/velocity}}" enctype="mutipart/form-data" method="post"> <input type="file" name="file" id="my_upload" /> </form> {{/html}} This resulted in the same upload error as if i had all previous code. However, if in object editor i remove any object typed as JavaScriptExtension, the code just does nothing ( -- View this message in context: http://xwiki.475771.n2.nabble.com/HTML5-File-Upload-tp7583955p7583959.html Sent from the XWiki- Users mailing list archive at Nabble.com.