Read details from script button paypal

[AntonioCuomo]

I have a button generated by pay pal and loaded into UniURLFrame.I wish I could copy into single details and err variables that are returned by java functions:

     }]
        });
      },
      onApprove: function(data, actions) {
        return actions.order.capture().then(function(details) {
          alert('Transaction completed by ' + details.payer.name.given_name + '!');
        });
      },
      onError: function(err) {
        console.log(err);
      },
    }).render('#paypal-button-container');
  }

Is possible?