Angular 1 File Upload example

<!DOCTYPE html>
<html lang="en">
<body ng-app="myapp" ng-controller="UploadCtrl">
  <input type="file" file-change="upload">

//
  // Reusable Uploader service.
  //
  app.factory('Uploader', function($q, $rootScope) {
    this.upload = function(url, file) {
      var deferred = $q.defer(),
          formdata = new FormData(),
          xhr = new XMLHttpRequest();

formdata.append('file', file);

xhr.onreadystatechange = function(r) {
        if (4 === this.readyState) {
          if (xhr.status == 200) {
            $rootScope.$apply(function() {
              deferred.resolve(xhr);  
            });
          } else {
            $rootScope.$apply(function() {
              deferred.reject(xhr);  
            });
          }
        }
      }
      xhr.open("POST", url, true);
      xhr.send(formdata);
      return deferred.promise;
    };
    return this;
  })

//
  // fileChange directive because ng-change doesn't work for file inputs.
  //
  app.directive('fileChange', function() {
    return {
      restrict: 'A',
      link: function(scope, element, attrs) {
        element.bind('change', function() {
          scope.$apply(function() {
            scope[attrs['fileChange']](element[0].files);
          })
        })
      },
    }
  })

//
  // Example controller
  //
  app.controller('UploadCtrl', function($scope, $http, Uploader) {
    $scope.upload = function(files) {
      var r = Uploader.upload('/uploads', files[0]);
      r.then(
        function(r) {
          // success
        },
        function(r) {
          // failure
        });
    }
  });
  </script>
</body>
</html>

https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js