如何从具有ID的数组中获取多个对象？

Question

I am stuck with Javascript basics.. Working in Angular.

I have an array with objects:

 $scope.persons = [
  {
    id: 1,
    name:'jack'
  },
  {
    id: 2,
    name:'John'
  },
  {
    id: 3,
    name:'eric'
  },
  {
    id: 2,
    name:'John'
  }
]

I would like to get the all objects that have same id with userId. So, loop through objects if the object id matches to user id select it.

$scope.getResult = function(userId){
   $scope.userId = userId;

   for(var i=0;i < $scope.persons.length; i++){

     if($scope.persons[i].id === $scope.userId){
       $scope.result = $scope.persons[i];
     }
   }
    $scope.userLogs = $scope.result;
 };

I get here only the last object which has the same id with userId.

How do I list all the objects that have the same id with userId?

Live: http://jsfiddle.net/sb0fh60j/

Thnx in advance!

Answer 1

You can use filter

 $scope.getUsers = function(x){
   $scope.userId = x;

   $scope.userLogs = $scope.persons.filter(function (person) {
       return person.id === x;   
   })
 };

Example

Or, in your case, you need declare result as array before loop, and add matches to it, like this

$scope.getUsers = function(x){
   $scope.userId = x;
   $scope.result = [];

   for(var i=0;i < $scope.persons.length; i++){

     if($scope.persons[i].id === $scope.userId){
       $scope.result.push($scope.persons[i]);
     }
   }
    $scope.userLogs = $scope.result;
 };

Example

Answer 2

You are constantly overwriting your result as it is no array. try this instead:

$scope.result[] = $scope.persons[i];

Answer 3

而不是分配，您需要将该对象推送到数组

$scope.result.push($scope.persons[i]);

Answer 4

$scope.result is not an array..

you have to declare a var result = []; and then you can do result.push($scope.persons[i]);

I don't understand why are you using $scope.result , it is useless to instantiate an attribute of the $scope and its watcher for this purpose, imho

edit: is useless also assign x to $scope; added alse a jsfiddle

jsfiddle