AngularJS Ajax Spinner

HTML

<div ng-app="project">
  <div id="loading">Loading...</div>
  <h2>JavaScript Projects</h2>
  <div ng-view></div>



  <!-- CACHE FILE: list.html -->
  <script type="text/ng-template" id="list.html">
    <input type="text" ng-model="search" class="search-query" placeholder="Search">
    <table>
      <thead>
      <tr>
        <th>Project</th>
        <th>Description</th>
        <th><a href="#/new"><i class="icon-plus-sign"></i></a></th>
      </tr>
      </thead>
      <tbody>
      <tr ng-repeat="project in projects | filter:search | orderBy:'name'">
        <td><a href="{{project.site}}" target="_blank">{{project.name}}</a></td>
        <td>{{project.description}}</td>
        <td>
          <a href="#/edit/{{project._id.$oid}}"><i class="icon-pencil"></i></a>
        </td>
      </tr>
      </tbody>
    </table>
  </script>



  <!-- CACHE FILE: detail.html -->
  <script type="text/ng-template" id="detail.html">
    <form name="myForm">
      <div class="control-group" ng-class="{error: myForm.name.$invalid}">
        <label>Name</label>
        <input type="text" name="name" ng-model="project.name" required>
        <span ng-show="myForm.name.$error.required" class="help-inline">
            Required</span>
      </div>
    
      <div class="control-group" ng-class="{error: myForm.site.$invalid}">
        <label>Website</label>
        <input type="url" name="site" ng-model="project.site" required>
        <span ng-show="myForm.site.$error.required" class="help-inline">
            Required</span>
        <span ng-show="myForm.site.$error.url" class="help-inline">
            Not a URL</span>
      </div>
    
      <label>Description</label>
      <textarea name="description" ng-model="project.description"></textarea>
    
      <br>
      <a href="#/list" class="btn">Cancel</a>
      <button ng-click="save()" ng-disabled="isClean() || myForm.$invalid"
              class="btn btn-primary">Save</button>
      <button ng-click="destroy()"
             ...

CSS

</style> <!-- Ugly Hack due to jsFiddle issue: http://goo.gl/BUfGZ --> 
<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script src="http://code.angularjs.org/angular-1.0.0rc5.min.js"></script>
<script src="http://code.angularjs.org/angular-resource-1.0.0rc5.min.js"></script>
<style>
#loading { position: absolute; left: 0px; top: 0px; display: none; background: gold; padding: 0.3em; font-weight: bold; }

JavaScript

angular.module('SharedServices', [])
    .config(function ($httpProvider) {
        $httpProvider.responseInterceptors.push('myHttpInterceptor');
        var spinnerFunction = function (data, headersGetter) {
            // todo start the spinner here
            $('#loading').show();
            return data;
        };
        $httpProvider.defaults.transformRequest.push(spinnerFunction);
    })
// register the interceptor as a service, intercepts ALL angular ajax http calls
    .factory('myHttpInterceptor', function ($q, $window) {
        return function (promise) {
            return promise.then(function (response) {
                // do something on success
                // todo hide the spinner
                $('#loading').hide();
                return response;

            }, function (response) {
                // do something on error
                // todo hide the spinner
                $('#loading').hide();
                return $q.reject(response);
            });
        };
    })

angular.module('project', ['mongolab', 'SharedServices']).
  config(function($routeProvider) {
    $routeProvider.
      when('/list', {controller:ListCtrl, template:'list.html'}).
      when('/edit/:projectId', {controller:EditCtrl, template:'detail.html'}).
      when('/new', {controller:CreateCtrl, template:'detail.html'}).
      otherwise({redirectTo:'/list'});
  });


function ListCtrl($scope, Project) {
  $scope.projects = Project.query();
}


function CreateCtrl($scope, $location, Project) {
  $scope.save = function() {
    Project.save($scope.project, function(project) {
      $location.path('/edit/' + project._id.$oid);
    });
  }
}


function EditCtrl($scope, $location, $routeParams, Project) {
  var self = this;

  Project.get({id: $routeParams.projectId}, function(project) {
    self.original = project;
    $scope.project = new Project(self.original);
  });

  $scope.isClean = function() {
    return angular.equals(self.original, $scope.project);
 ...