Untitled

<script type="text/javascript">
      var bytesUploaded = 0;
      var bytesTotal = 0;
      var previousBytesLoaded = 0;
      var intervalTimer = 0;

      function fileSelected() {
        var file = document.getElementById('fileToUpload').files[0];
        var fileSize = 0;
        if (file.size > 1024 * 1024)
          fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';
        else
          fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';
        document.getElementById('fileInfo').style.display = 'block';
        document.getElementById('fileName').innerHTML = 'Name: ' + file.name;
        document.getElementById('fileSize').innerHTML = 'Size: ' + fileSize;
        document.getElementById('fileType').innerHTML = 'Type: ' + file.type;
      }

      function uploadFile() {
        previousBytesLoaded = 0;
        document.getElementById('uploadResponse').style.display = 'none';
        document.getElementById('progressNumber').innerHTML = '';
        var progressBar = document.getElementById('progressBar');
        progressBar.style.display = 'block';
        progressBar.style.width = '0px';

        var fd = new FormData();
        fd.append("author", "Shiv Kumar");
        fd.append("name", "Html 5 File API/FormData");
        fd.append("fileToUpload", document.getElementById('fileToUpload').files[0]);

        var xhr = new XMLHttpRequest();
        xhr.upload.addEventListener("progress", uploadProgress, false);
        xhr.addEventListener("load", uploadComplete, false);
        xhr.addEventListener("error", uploadFailed, false);
        xhr.addEventListener("abort", uploadCanceled, false);
        xhr.open("POST", "upload.php");
        xhr.send(fd);

        intervalTimer = setInterval(updateTransferSpeed, 500);
      }

      function updateTransferSpeed() {
        var currentBytes = bytesUploaded;
        var bytesDiff = currentBytes - previousBytesLoaded;
        if (bytesDiff == 0) return;
        previousBytesLoaded = currentBytes;
        bytesDiff = bytesDiff * 2;
        var bytesRemaining = bytesTotal - previousBytesLoaded;
        var secondsRemaining = bytesRemaining / bytesDiff;

        var speed = "";
        if (bytesDiff > 1024 * 1024)
          speed = (Math.round(bytesDiff * 100/(1024*1024))/100).toString() + 'MBps';
        else if (bytesDiff > 1024)
          speed =  (Math.round(bytesDiff * 100/1024)/100).toString() + 'KBps';
        else
          speed = bytesDiff.toString() + 'Bps';
        document.getElementById('transferSpeedInfo').innerHTML = speed;
        document.getElementById('timeRemainingInfo').innerHTML = '| ' + secondsToString(secondsRemaining);
      }

      function secondsToString(seconds) {
        var h = Math.floor(seconds / 3600);
        var m = Math.floor(seconds % 3600 / 60);
        var s = Math.floor(seconds % 3600 % 60);
        return ((h > 0 ? h + ":" : "") + (m > 0 ? (h > 0 && m < 10 ? "0" : "") + m + ":" : "0:") + (s < 10 ? "0" : "") + s);
      }

      function uploadProgress(evt) {
        if (evt.lengthComputable) {
          bytesUploaded = evt.loaded;
          bytesTotal = evt.total;
          var percentComplete = Math.round(evt.loaded * 100 / evt.total);
          var bytesTransfered = '';
          if (bytesUploaded > 1024*1024)
            bytesTransfered = (Math.round(bytesUploaded * 100/(1024*1024))/100).toString() + 'MB';
          else if (bytesUploaded > 1024)
            bytesTransfered = (Math.round(bytesUploaded * 100/1024)/100).toString() + 'KB';
          else
            bytesTransfered = (Math.round(bytesUploaded * 100)/100).toString() + 'Bytes';

          document.getElementById('progressNumber').innerHTML = percentComplete.toString() + '%';
          document.getElementById('progressBar').style.width = (percentComplete * 3.55).toString() + 'px';
          document.getElementById('transferBytesInfo').innerHTML = bytesTransfered;
          if (percentComplete == 100) {
            document.getElementById('progressInfo').style.display = 'none';
            var uploadResponse = document.getElementById('uploadResponse');
            uploadResponse.innerHTML = '<span style="font-size: 18pt; font-weight: bold;">Please wait...</span>';
            uploadResponse.style.display = 'block';
          }
        }
        else {
          document.getElementById('progressBar').innerHTML = 'unable to compute';
        }
      }

      function uploadComplete(evt) {
        clearInterval(intervalTimer);
        var uploadResponse = document.getElementById('uploadResponse');
        uploadResponse.innerHTML = evt.target.responseText;
        uploadResponse.style.display = 'block';
      }

      function uploadFailed(evt) {
        clearInterval(intervalTimer);
        alert("An error occurred while uploading the file.");
      }

      function uploadCanceled(evt) {
        clearInterval(intervalTimer);
        alert("The upload has been canceled by the user or the browser dropped the connection.");
      }

    </script>