controllers_cvs2_task.js

vm.downloadcsv = function() {
        $http({
              method: 'GET',
              url: '/api/v1/activities/record/'+vm.query.domain.id+'/csv',
              params: {
                  'datesince': vm.query.datesince,
                  'dateto':vm.query.dateto,
                  'verbs':vm.query.verb
              },
              responseType: 'arraybuffer'
        }).success(function (data, status, headers, response) {
            $localStorage.downloading_csv = {
                status: true,
                task_id : response.taskId
            };
            updateCSVStatus();
            swal("La carga masiva de usuarios esta en curso...", "", "success");
            headers = headers();
            var filename = headers['x-filename'];
            var contentType = headers['content-type'];
            var linkElement = document.createElement('a');
            try {
                var blob = new Blob([data], { type: contentType });
                var url = window.URL.createObjectURL(blob);

                linkElement.setAttribute('href', url);
                linkElement.setAttribute("download", filename);

                var clickEvent = new MouseEvent("click", {
                    "view": window,
                    "bubbles": true,
                    "cancelable": false
                });
                linkElement.dispatchEvent(clickEvent);
            } catch (ex) {
                console.log(ex);
            }
        }).error(function (data, response) {
            console.log(data);
            $localStorage.loading_csv = {
                status: false
            };

            var errorMessage = "Hubo un problema con la descarga.";
            if(response && response.nonFieldErrors.length > 0){
                errorMessage = response.nonFieldErrors[0];
            }

            vm.loading_csv = $localStorage.loading_csv.status;
            swal(errorMessage, "", "error");
        });
    };

    var updateCSVStatus = function(){
        var downloading_csv = $localStorage.downloading_csv;
        var taskId = downloading_csv ? downloading_csv.task_id : null;
        if(taskId){
            var url = '/api/v1/tasks/' + taskId + '/status';
            $http.get(url)
                .success(function(response){
                    if (response.task.status == 'SUCCESS') {
                        $localStorage.downloading_csv = {
                            status: false
                        };
                        vm.downloading_csv = false;
                    } else {
                        $timeout(updateCSVStatus, 1000);
                        vm.downloading_csv = $localStorage.downloading_csv.status;
                    }
                })
                .error(function(response){
                    $localStorage.downloading_csv = {
                        status: false
                    };
                });
        }
    };