HTML5 Load local file on to canvas

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Load Image</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">

</head>
<body>

  <input type='file' name='img' size='65' id='uploadimage' />
  <br>
  <canvas id="canvas" width="500" height="500"></canvas>

</body>
  <script>
    document.getElementById("uploadimage").addEventListener("change", draw, false);

    function draw(ev) {
      console.log(ev);
      var ctx = document.getElementById('canvas').getContext('2d'),
        img = new Image(),
        f = document.getElementById("uploadimage").files[0],
        url = window.URL || window.webkitURL,
        src = url.createObjectURL(f);

      img.src = src;
      img.onload = function() {
        ctx.drawImage(img, 0, 0);
        url.revokeObjectURL(src);
      }
    }

  </script>

</html>