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POChrome/WebKit XHR File Upload
 

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  1. POChrome/WebKit XHR File Upload
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    <p>I have searched relentlessly but just can't figure this one out. Why will this XHR connection work <strong>perfectly fine in Firefox</strong> but breaks in Chrome? I'm using this in conjunction with AngularJS, by the way.</p> <pre class="lang-js prettyprint-override"><code>$scope.upload = function(project, file) { var formData = new FormData(); //Not really sure why we have to use FormData(). Oh yeah, browsers suck. formData.append('', file.file); //The real file object is stored in this file container file.xhr = new XMLHttpRequest(); file.xhr.open('PUT', '/api/projects/'+project._id+'/files', true); //Progress event listener file.xhr.upload.onprogress = function(event) { if(event.lengthComputable) { file.uploadPercent = Math.round(event.loaded / event.total * 100); } }; //Upload complete listener file.xhr.upload.onload = function(event) { file.uploaded = true; }; //Every time the status changes file.xhr.onreadystatechange = function(event) { if(event.target.readyState == 4) { //The file has been added, so tag the ID onto the file object console.log(event.target.responseText); file._id = JSON.parse(event.target.responseText)._id; } else { return; } }; file.xhr.send(formData); }; </code></pre> <p>In Firefox, the file is sent just fine to my server, and the <code>responseText</code> is returned exactly like I'd expect. However, in Chrome, I get this error: <code>Error: INVALID_STATE_ERR: DOM Exception 11 Error: An attempt was made to use an object that is not, or is no longer, usable.</code>, which would be more helpful if it told me exactly what object was attempted to be used. I've read <a href="https://stackoverflow.com/a/5319647/371273">here</a> that I should try to set <code>async</code> to false and use <code>onreadystatechange</code>, but I'm not sure how that helps, since I'm already using <code>onreadystatechange</code>.</p>
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    1. PTQuestion
    1. USCommunity
    1. USMatt Reyer
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    1. CODid you read this, http://stackoverflow.com/questions/3488698/invalid-state-err-dom-exception-11-webkit ?
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      1. POChrome/WebKit XHR File Upload
      1. USSalman
    2. CO(ಠ_ಠ) I referenced that post in my question, specifically the answer by Dave Lampert. When I set `async` to false in my `xhr.open()` call, the error is gone but Chrome still doesn't even send the file to the server.
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      1. POChrome/WebKit XHR File Upload
      1. USMatt Reyer
    3. COIf you create a [fiddle](http://jsfiddle.net/) I'm happy to take a look. Here's a simplified version of [my upload service](http://jsfiddle.net/5CYDV/). Maybe that helps :)
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      1. POChrome/WebKit XHR File Upload
      1. USJohn B.
 

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