Javascript 在$q.all解析后对对象数组进行排序

使用AngularJs编写应用程序。我想检索用户加入的所有组的列表

我写了以下内容：

controller('DashCtrl', function($scope, $q, $localStorage, AuthService, DatabaseService, GroupService) {
  console.log("*** DashCtrl ***");
  var user = AuthService.currentUser;
  $scope.user = user;
  var uid = $scope.user.auth.uid;

  $scope.joinedGroups = [];

  var tmpGroups = [];
  var addGroupDetailsPromises = [];

  GroupService.getUserJoinedGroupsArray($scope.user.auth.uid)
  .then(function(groups) {
    for (var i = 0; i < groups.length; i++) {
      var tmpGroup = {};
      tmpGroup.id = groups[i];
      addGroupDetailsPromises.push(addGroupDetails(tmpGroup));
      tmpGroups.push(tmpGroup);
    }
  })
  .catch(function(error) {
    console.log('Error retrieving groups: ', error);
  });

  // Once all details have been added to groups, sort groups
  $q.all(addGroupDetailsPromises).then(function() {
    console.log(tmpGroups.length);
    tmpGroups.sort(function(a, b) {
      console.log('a: ', a.details.timestamp);
      console.log('b: ', b.details.timestamp);
      return a.details.timestamp - b.details.timestamp;
    });

    console.log(tmpGroups);
    $scope.joinedGroups = tmpGroups;
  }).catch(function(error) { console.log(error); });

  function addGroupDetails(tmpGroup) {
    var promise = new Promise(function(resolve, reject) {
      GroupService.getGroupDetailsObj(tmpGroup.id).then(function(details) {
        tmpGroup.details = details;
        tmpGroup.display = {};
        var eventDate = new Date(details.timestamp);
        var today = new Date();

        if (eventDate >= today) {
          tmpGroup.display.day = eventDate.getDate();
          tmpGroup.display.month = monthNames[eventDate.getMonth()].substr(0, 3);
          tmpGroup.display.time = eventDate.getHours() + ":" + eventDate.getMinutes();

        }

        resolve();
      });
    });

    return promise;
  };

  var monthNames = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

})

controller（'DashCtrl'，function（$scope，$q，$localStorage，AuthService，DatabaseService，GroupService）{
console.log（“***DashCtrl***”）；
var user=AuthService.currentUser；
$scope.user=用户；
var uid=$scope.user.auth.uid；
$scope.joinedGroups=[]；
var tmpGroups=[]；
var addGroupDetailsPromises=[]；
GroupService.getUserJoinedGroupsArray（$scope.user.auth.uid）
.然后（功能（组）{
对于（变量i=0；i=今天）{
tmpGroup.display.day=eventDate.getDate（）；
tmpGroup.display.month=monthNames[eventDate.getMonth（）].substr（0,3）；
tmpGroup.display.time=eventDate.getHours（）+“：”+eventDate.getMinutes（）；
}
解决（）；
});
});
回报承诺；
};
var monthNames=[“一月”、“二月”、“三月”、“四月”、“五月”、“六月”、“七月”、“八月”、“九月”、“十月”、“十一月”、“十二月”]；
})

我的组数组（tmpGroups）从未进行排序。根据my console.log（tmpGroups.length）的输出，数组的长度等于0。。。我想这就是为什么它从未被分类的原因

但我不理解结果，因为我的数组应该充满所有的信息，因为我使用了$q.all，它等待所有承诺得到解决

有什么建议吗

---

谢谢，这是因为GroupService.getUserJoinedGroupsArray是异步调用。您必须等待它完成，然后将列表推送到tmpGroups，然后执行承诺。试着把承诺放进去

GroupService.getUserJoinedGroupsArray($scope.user.auth.uid)
  .then(function(groups) {
    for (var i = 0; i < groups.length; i++) {
      var tmpGroup = {};
      tmpGroup.id = groups[i];
      addGroupDetailsPromises.push(addGroupDetails(tmpGroup));
      tmpGroups.push(tmpGroup);
    }

    // Once all details have been added to groups, sort groups
    $q.all(addGroupDetailsPromises).then(function() {
       console.log(tmpGroups.length);
       tmpGroups.sort(function(a, b) {
         console.log('a: ', a.details.timestamp);
         console.log('b: ', b.details.timestamp);
         return a.details.timestamp - b.details.timestamp;
    });

      console.log(tmpGroups);
     $scope.joinedGroups = tmpGroups;
    }).catch(function(error) { console.log(error); });
    })
  .catch(function(error) {
    console.log('Error retrieving groups: ', error);
  });

GroupService.getUserJoinedGroupsArray（$scope.user.auth.uid）
.然后（功能（组）{
对于（变量i=0；i

嘿，伙计们，我遇到了一个类似的问题……看起来几乎一样，是一个异步问题，但在返回控制器之前，无法确定我的排序需要在哪里对结果进行预排序。你能看一下吗？