file upload test

    var fr = new FileReader(), buf, file = element.files[0];
    var etags = [];
    var partSize = 6 * 1024 * 1024; // constant
    var totalSize = file.size;
    var numParts = Math.ceil(totalSize / partSize);
    var key = null;
    var uplaodId  = null;

    // 1. Init Upload
    coverService.initUpload({fileName: file.name, fileType: 'video'}, function(res){
      key = res.data.Key;
      uplaodId = res.data.UploadId;
      uploadPart(1);
    });

    // 2. send parts
    function uploadPart(partNum){
      if (partNum > numParts) {
        completeMultipartUpload();
        return;
      }
      console.log("Uploading part " + partNum);
      var start = (partNum - 1) * partSize;
      var end = start + partSize;
      if (end > totalSize)
        end = totalSize;
      var length = end - start;
      var curBlobPart = file.slice(start, end);

      data = {
        'part': curBlobPart,
        'Key': key,
        'UploadId': uplaodId,
        'PartNumber': partNum
      }
      console.log('part ',data);
      coverService.sendParts(data, function(result){
        console.log(result);
        
        //get the etags array
        etags.push({
          'ETag': result.data.ETag,
          'PartNumber': result.data.PartNumber 
        });
        uploadPart(partNum +1);
      });

    }

    function completeMultipartUpload(){
      etags.sort(function(a, b){
        var nameA= a.PartNumber, nameB=b.PartNumber
        if (nameA < nameB) //sort string ascending
        return -1 
        if (nameA > nameB)
        return 1

        return 0 //default return value (no sorting)
      })
      send = {
        'Key': key,
        'UploadId': uplaodId,
        'Parts': etags
      }
      //3. Finish upload
      console.log('ultimo', send);
      coverService.completeUpload(send, function(out){
        console.log(out);
      })
    }

    //fr.onload = function(e) {

      ////buf = new Uint8Array(e.target.result);

      ////for (var i = 0, blobs = []; i < buf.length; i += 6e6)
        ////blobs.push(new Blob([buf.subarray(i, i + 6e6)], {type: file.type} ));

      //// 1. Init Upload
      //coverService.initUpload({fileName: file.name, fileType: 'video'}, function(res){

        //angular.forEach(blobs, function(ele, id){
          //data = {
            //'part': file.slice(),
            //'Key': res.data.Key,
            //'UploadId': res.data.UploadId,
            //'PartNumber': id+1
          //}
          //// 2. send parts
          //console.log('part ',data);
          //coverservice.sendparts(data, function(result){
            //console.log(result);
            
            ////get the etags array
            //etags.push({
              //'etag': result.data.etag,
              //'partnumber': result.data.partnumber 
            //});

            //if(result.data.PartNumber == blobs.length){//if last 
              ////order parts 
              //etags.sort(function(a, b){
                //var nameA= a.PartNumber, nameB=b.PartNumber
                //if (nameA < nameB) //sort string ascending
                  //return -1 
                //if (nameA > nameB)
                  //return 1

                //return 0 //default return value (no sorting)
              //})
              //send = {
                //'Key': res.data.Key,
                //'UploadId': res.data.UploadId,
                //'Parts': etags
              //}
              ////3. Finish upload
              //console.log('ultimo', send);
              //coverService.completeUpload(send, function(out){
                //console.log(out);
              //})
            //}
          //});

        //});
      //}); 
    //};


    //fr.readAsArrayBuffer(file);