如何使用angularJS restful服务从外部文件中使用json数据

Question

//Service.js File
angular.module('calenderServices', ['ngResource']).
factory('Events', function($resource){
return $resource('/EventCalender/:File.json', {}, {
query: {method:'GET', params:{File:'events'}, isArray:true}
});
});


        //This is my app Module
angular.module('calender', ['eventFilters','highlight','event','calenderServices']).
config(['$routeProvider', function($routeProvider) {
$routeProvider.
  when('', {templateUrl: 'template.html',   controller: MonthCtrl}).
  otherwise({redirectTo: '/invalid'});
}]);


     //This is my filter.js
angular.module('eventFilters', ['calenderServices']).filter('compare', function(Events) {
var events=Events.query();
alert(events[0].name); //it is displaying the name "Milestone1" });


     //This is my controller.
function MonthCtrl($scope, Events){
var events=Events.query();
    alert(events[0].name); //it is displaying undefined
    }

     //whenever i try to use the variable 'events' in controller, it is displaying undefined or null.  But in filter it is working fine. 

Answer 1

由于ngResource会发出异步http请求，因此以下操作无法工作。

var events=Events.query();
alert(events[0].name); // <--- here events is an empty array

通常，您只需执行以下操作，即可在视图中显示您的数据

$scope.events = Events.query()

这看起来像是一个同步操作，其实不然。这是Angular的禅在起作用。你可以从文件中了解细节。

Events.query(function(events){
    // here you have access to the first event's name
    console.log(events[0].name);
});