var files = event.getSource().get("v.files");
    var fileList =[];
    var fileData =[];
    var fileTypes = [];
    var vCount =0;
    var vFileLength = files.length;
    if(files.length > 0){
        var objFileReader;
        for(var i =0; i<files.length; i++) {
            var file = files[i];
            objFileReader = new FileReader();
            objFileReader.onload = $A.getCallback(function() {
                var fileContents = objFileReader.result;

                var base64Mark = 'base64,';
                var dataStart = fileContents.indexOf(base64Mark) + base64Mark.length;

                fileContents = fileContents.substring(dataStart);
                fileList.push(file.name);
                fileData.push(fileContents);
                fileTypes.push(file.type);
                vCount++;
                helper.getFileCount(component,event,vCount,vFileLength,fileList,fileData,fileTypes);
            });
            objFileReader.readAsDataURL(file);
        }

    }

});
   action.setCallback(this, function(response) {
       var state = response.getState();
       if (state === "SUCCESS") {
           alert('Upload is Success!!');
       }
   });
   $A.enqueueAction(action);