file-svc.js

angular.module('file.upload', [])
    .factory('fileSvc', ['$http', '$q', function ($http, $q) {
        'use strict';

        var factory = {};

        factory.readFile = function (file) {
            return $q(function (resolve, reject) {
                if (!file)
                    reject('file= ' + file);

                var reader = new FileReader();
                reader.onload = function () {
                    resolve(reader.result);
                    reader.abort(); // TODO gc - reader = null?
                };
                reader.readAsText(file);
            });
        };
        return factory;
    }])
    .directive('fileModel', ['$parse', function ($parse) {
                    'use strict';

                    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]);
                                });
                            });
                        }
                    };
                }]);