ng-flow usage JavaScript

    $scope.existingFlowObject = flowFactory.create({
        singleFile: true,
        target: base_url + 'file',
        testChunks: false
    });


    $scope.deleteImage = function () {
        $scope.existingFlowObject.cancel();
        $scope.infant.imageId = null;
    };

    $scope.uploadLogEvent = function (image_id) {
        if (!isNaN(image_id) && image_id !== null) {
            $scope.newLogEvent.imageId = image_id;
        }
        var sendData = {
            infant_id: $scope.infant.infantId,
            duration: $scope.dur.days + ' ' + $scope.dur.hours + ':' + $scope.dur.minutes,
            start_date: $scope.prepareDate($scope.newLogEvent.startDate, $scope.newLogEvent.startDate),
            event_category: $scope.newLogEvent.eventCategory,
            event_type: $scope.newLogEvent.eventType,
            sickness_type: $scope.newLogEvent.sicknessType,
            number_detail: $scope.newLogEvent.numberDetail,
            text_detail: $scope.newLogEvent.textDetail,
            comment: $scope.newLogEvent.comment,
            file_id: $scope.newLogEvent.imageId
        };

        if (sendData.duration === "0 0:0") {
            sendData.duration = null;
        }

        rest.post('event')
                .preload('event')
                .data(sendData)
                .success(function (data) {
                    if (data.status === 'ok') {
                        //$scope.showAlert();
                        self.reset();
                        $scope.reloadPage();
                    }
                })
                .send();
    };

$scope.save() {
    //...
    if ($scope.existingFlowObject.files.length)
    // po zakońceniu żądania automatycznie wywolywana funkcja uploadLogEvent(image_id)
        existingFlowObject.upload()
    }
    else {
    $scope.uploadLogEvent(null);
    }
}