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POS3 browser upload via POST: unable to handle errors gracefully
 

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  1. POS3 browser upload via POST: unable to handle errors gracefully
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    <p>I am writing an app where I want the customer to be able to upload to Amazon S3 straight from the browser. I can make this work just fine. But when errors occur, I want to handle them more gracefully than splattering an XML document on the customer's screen.</p> <p>I have a scheme that I think would work, but it's failing. Here's what I'm trying:</p> <ol> <li>Create a form to do the upload, and store the form on S3 itself, in the same domain as the "action" attribute of the form.</li> <li>Redirect the customer to this form. Now their browser is sitting on <a href="https://&lt;bucket&gt;.s3.amazonaws.com/something" rel="nofollow noreferrer">https://&lt;bucket&gt;.s3.amazonaws.com/something</a>.</li> <li>The page contains a hidden iframe. The form sets its target to the iframe.</li> <li>The load event handler looks at the contents of the iframe, and acts upon it.</li> </ol> <p>So, something like this:</p> <pre><code>&lt;iframe id="foo" name="foo" style="display: none" /&gt; &lt;form target="foo" action="https://&lt;bucket&gt;.s3.amazonaws.com/"&gt; &lt;input type="hidden" name="..." value="..." /&gt; &lt;input type="file" name="file" /&gt; &lt;/form&gt; </code></pre> <p>with this javascript (using jquery):</p> <pre><code>function handler() { var message = $("#foo").contents().find('message').text(); alert(message); } $("#foo").load(handler); </code></pre> <p>Using firebug, I can see that the iframe contains an XML document, that contains a "message" node. However, the <code>.find('message')</code> always fails to find anything within the XML document.</p> <p>Notice that the action of the form has the same domain, port, and scheme as the document itself. So, I don't think that I should be running afoul of the same-origin policy. Right? But it fails every time. This is using Firefox and Google Chrome browsers.</p> <p>Thanks for any advice!</p>
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