Utility.js

var Utility = {
  onFileSystemSuccess : function(){
      fileSystem.getDirectory("batch", {
            create: false,
            exclusive: false
        }, onGetDirectorySuccess, onGetDirectoryFail);
  }

};

function onGetDirectorySuccess(dir) 
{
    dir.getFile('product.json', {
            create: false,
            exclusive: false
        }, gotFileEntry, onError);
 }

function onGetDirectoryFail(err)
{
      console.log('Direcotory Error :'+err);
}

////////////////////////////////////

function gotFileEntry(dir){
      Dialog.create({
        title: 'Confirm',
        message: 'Select option to progress..',
        buttons: [
          {
            label: 'Synch',
            handler () {
              console.log('Synching to server...')
            }
          },
          {
            label: 'Continue',
            handler () {
              console.log('Please wait..!')
            }
          }
        ]
    });
 }

function onError(e) {
        console.log(e);
        Dialog.create({
            title: 'Confirm',
            message: 'Select option to progress..',
            buttons: [
              {
                label: 'Continue',
                handler () {
                  console.log('Please wait..!')
                }
              }
            ]
        });
}