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    <blockquote> <p><strong>Update</strong></p> <p>BlobBuilder has been <a href="https://developer.mozilla.org/en-US/docs/Web/API/BlobBuilder" rel="nofollow noreferrer">obsoleted</a> see how you go using it, if you're using it for testing purposes.</p> <p>Otherwise apply the below with migration strategies of going to <em>Blob</em>, such as the answers to <a href="https://stackoverflow.com/questions/15030906/how-to-replace-the-deprecated-blobbuilder-with-the-new-blob-constructor">this question</a>.</p> </blockquote> <h3>Use a Blob instead</h3> <p>As an alternative there is a <a href="https://developer.mozilla.org/en/DOM/Blob" rel="nofollow noreferrer">Blob</a> that you can use in place of <a href="https://developer.mozilla.org/en/DOM/File" rel="nofollow noreferrer">File</a> as it is what File interface derives from as per <a href="http://www.w3.org/TR/FileAPI/#file" rel="nofollow noreferrer">W3C spec</a>:</p> <pre><code>interface File : Blob { readonly attribute DOMString name; readonly attribute Date lastModifiedDate; }; </code></pre> <blockquote> <p>The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system.</p> </blockquote> <h3>Create the Blob</h3> <p>Using the <a href="https://developer.mozilla.org/en/DOM/BlobBuilder" rel="nofollow noreferrer">BlobBuilder</a> like this on an existing JavaScript method that takes a File to upload via <code>XMLHttpRequest</code> and supplying a Blob to it works fine like this:</p> <pre><code>var BlobBuilder = window.MozBlobBuilder || window.WebKitBlobBuilder; var bb = new BlobBuilder(); var xhr = new XMLHttpRequest(); xhr.open('GET', 'http://jsfiddle.net/img/logo.png', true); xhr.responseType = 'arraybuffer'; bb.append(this.response); // Note: not xhr.responseText //at this point you have the equivalent of: new File() var blob = bb.getBlob('image/png'); /* more setup code */ xhr.send(blob); </code></pre> <h3>Extended example</h3> <p>The rest of the sample is up on <a href="http://jsfiddle.net/NickJosevski/VTSUs/" rel="nofollow noreferrer">jsFiddle</a> in a more complete fashion but will not successfully upload as I can't expose the upload logic in a long term fashion.</p>
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    1. POHow to instantiate a File object in JavaScript?
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    1. COThis comment is out of date. Do not use BlobBuilder, use Blob constructor. Blob(['mythingy'], { type: "thingy" })
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      1. USodinho - Velmont
 

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