如何修改对象数组中的json对象

Question

我有一个对象数组

// This is should be taken from database
$scope.users = [{"$id":"1","UserID":3,"Name":"A","Selected":false},{"$id":"2","UserID":4,"Name":"B","Selected":false},{"$id":"3","UserID":5,"Name":"C","Selected":false},{"$id":"4","UserID":6,"Name":"D","Selected":false}]

然后有一个数组，其中包含从上一屏幕中选择的用户

$scope.usersSelected = [{"$id":"3","UserID":5,"Name":"C","Selected":true,"$$hashKey":"object:83"},{"$id":"4","UserID":6,"Name":"D","Selected":true,"$$hashKey":"object:84"}]

如果在$scope.usersSelected 中找到$scope.users 的Selected 属性，我想更新它们。所以我迭代$scope.usersSelected然后在$scope.users的UserID中搜索它的UserID

for (var i = 0; i < $scope.usersSelected.length; i++) {
    var obj = $.grep($scope.users, function (e) { return e.UserID == $scope.usersSelected[i].UserID; });
    obj.Selected = true;
}

但Selected 属性不会更新。上面的代码有什么问题？

其次，我需要解释一下上面数组中的数据，为什么当我从数据库中填充数据时总是有"$id"，当我从另一个屏幕获取数据时还有"$$hashKey"？这些价值从何而来？

注意：我使用 AngularJS 和 ASP.NET Web API 2 从数据库中获取数据。

Answer 1

经过测试，工作正常

 $scope.users = [ {
        "$id" : "1",
        "UserID" : 3,
        "Name" : "A",
        "Selected" : false
    }, {
        "$id" : "2",
        "UserID" : 4,
        "Name" : "B",
        "Selected" : false
    }, {
        "$id" : "3",
        "UserID" : 5,
        "Name" : "C",
        "Selected" : false
    }, {
        "$id" : "4",
        "UserID" : 6,
        "Name" : "D",
        "Selected" : false
    } ];

    $scope.usersSelected = [ {
        "$id" : "3",
        "UserID" : 5,
        "Name" : "C",
        "Selected" : true,
        "$$hashKey" : "object:83"
    }, {
        "$id" : "4",
        "UserID" : 6,
        "Name" : "D",
        "Selected" : true,
        "$$hashKey" : "object:84"
    } ]
    var users = $scope.users;
    var usersSelected = $scope.usersSelected;
    for (var i = 0; i < users.length; i++) {
        for (var j = 0; j < usersSelected.length; j++) {
            debugger
            if (users[i].UserID == usersSelected[j].UserID) {
                console.log(users[i].UserID)
                console.log(usersSelected[j].UserID)
                users[i].Selected = true;

            }
        }

    }

    console.log(users)
    console.log(usersSelected);

Answer 2

用 javascript 测试。

usersSelected =  $scope.usersSelected;

users = $scope.users;

for (var i=0;i<users.length;i++){

  if (usersSelected.some(function(e) e.UserID == users[i].UserID)) {
    users[i].Selected = true;
    console.dir(users[i]);
  }


}