Angularjs form and file upload - how to get success or error

I want to create a form to upload name and a file.
I have managed to get it working, but not sure how to get success / error...

here is the code which works:

var app = angular.module('app', ['onsen', 'ngRoute']);

app.controller('page1', ['$scope', 'multipartForm', function($scope, multipartForm){
    console.log("Page 1 Controller");
    $scope.title = "Welcome";

    $scope.file_changed = function(element) {
        var photofile = element.files[0];
        var reader = new FileReader();
        reader.onload = function(e) {
            $scope.$apply(function() {
                $scope.prev_img = e.target.result;
            });
        };
        reader.readAsDataURL(photofile);
    };

    $scope.form = {};
    $scope.Submit = function(){
        var uploadUrl = 'api/process2.php';
        multipartForm.post(uploadUrl, $scope.form);
    }
}]);

app.directive('fileModel', ['$parse', function($parse){
    return {
        restrict: 'A',
        link: function(scope, element, attrs){
            var model = $parse(attrs.fileModel);
            var modelSetter = model.assign;

            element.bind('change', function(){
                scope.$apply(function(){
                    modelSetter(scope, element[0].files[0]);
                })
            })
        }
    }
}])



app.service('multipartForm', ['$http', function($http){
    this.post = function(uploadUrl, data){
        var fd = new FormData();
        for(var key in data)
            fd.append(key, data[key]);
        $http.post(uploadUrl, fd, {
            transformRequest: angular.indentity,
            headers: { 'Content-Type': undefined }
        });
    }
}])

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Ideally i would like to add a progress bar to this aswell... but I dont know how.