Downloading mp3 files using html5 blobs in a chrome-extension

Question

I am trying to create a google-chrome-extension that will download an mp3 file. I am trying to use HTML5 blobs and an iframe to trigger a download, but it doesn\'t seem to b

Answer 1

I'm not sure, but i think this is your server's trouble. I've just tried your piece of code to download some sample blob of mp3-file and everything went ok. So maybe:

1. this file doesn't exist on your server
2. you server outputs wrong mime type for mp3 files

Answer 2

The below code worked for me in Google chrome 14.0.835.163:

var finalURL = "http://localhost/Music/123a4.mp3";
var xhr = new XMLHttpRequest();
xhr.overrideMimeType("application/octet-stream");
//xhr.setRequestHeader('Access-Control-Allow-Origin', '*');
xhr.open("GET", finalURL, true);
xhr.responseType = "arraybuffer";
xhr.onload = function() {
      var bb = new (window.BlobBuilder || window.WebKitBlobBuilder)();
      var res = xhr.response;
      if (res){
          var byteArray = new Uint8Array(res);
      }
      bb.append(byteArray.buffer);
      var blob = bb.getBlob("application/octet-stream");
      var iframe = document.createElement("iframe");
      iframe.style.display = "none";
      iframe.src = window.webkitURL.createObjectURL(blob);
      document.body.appendChild(iframe);
};
xhr.send(null);