Question

我有一个JSON数组，其属性为id和parentActivityId。

$scope.data = [
    {
        id: 1,
        activityName: "Drilling",
        parentActivityId: 0,
        items: [
            {
                id: 2,
                activityName: "Blasting",
                parentActivityId: 1,
                items: [
                    {
                        id: 3,
                        activityName: "Ann",
                        parentActivityId: 2,
                        items: [],

                    },
                    {
                        id: 4,
                        activityName: "Ann",
                        parentActivityId: 2,
                        items: [],

                    }
                ]
            },
            {
                id: 5,
                activityName: "Transport",
                parentActivityId: 1,
                items: [
                    {
                        id: 6,
                        activityName: "Daniel",
                        parentActivityId: 5,
                        items: [],
                    }
                ]
            }
        ]
    }
];

我想根据parentActiityId推送一个新项目。新项目将有一个新的id。示例：如果我的对象是这样的：

{
    id: 7,
    activityName: "Drilling",
    parentActivityId: 1,
    items: []
}

然后我的对象看起来像这样..

 $scope.data = [
        {
            id: 1,
            activityName: "Drilling",
            parentActivityId: 0,
            items: [
                {
                    id: 2,
                    activityName: "Blasting",
                    parentActivityId: 1,
                    items: [
                        {
                            id: 3,
                            activityName: "Ann",
                            parentActivityId: 2,
                            items: [],

                        },
                        {
                            id: 4,
                            activityName: "Ann",
                            parentActivityId: 2,
                            items: [],

                        },
                    {
                         id: 7,
                         activityName: "Drilling",
                         parentActivityId: 2,
                         items: [],
                     }
                    ]
                },
                {
                    id: 5,
                    activityName: "Transport",
                    parentActivityId: 1,
                    items: [
                        {
                            id: 6,
                            activityName: "Daniel",
                            parentActivityId: 5,
                            items: [],
                        }
                    ]
                }
            ]
        }
    ];

我尝试给这个循环..

var arrObj = {
    id: 7,
    activityName: "Drilling",
    parentActivityId: 1,
    items: []
};

function populateObj(arrObj) {
   for (var i = 0; i < $scope.data.length; i++) {
        if ($scope.data[i].id == arrObj.parentActivityId) {
            $scope.data.push(arrObj);
        }
    }
};

populateObj(arrObj);

只会推送到parent。我想在for循环中识别子节点，并通过识别thr parentActivityId.Any帮助来推送到特定的数组对象。将非常感激。

Answer 1

使用递归提案和Array.prototype.reduce()：

＆＃13;

var data=[{id:1,activityName:"Drilling",parentActivityId:0,items:[{id:2,activityName:"Blasting",parentActivityId:1,items:[{id:3,activityName:"Ann",parentActivityId:2,items:[]},{id:4,activityName:"Ann",parentActivityId:2,items:[]}]},{id:5,activityName:"Transport",parentActivityId:1,items:[{id:6,activityName:"Daniel",parentActivityId:5,items:[]}]}]}],
    child = { id: 7, activityName: "Drilling", parentActivityId: 1, items: [] };

function getParent(r, a) {
    return a.id === child.parentActivityId ? a : a.items.reduce(getParent, r);
}

var node = data.reduce(getParent, {});
'items' in node && node.items.push(child);

document.write('<pre>' + JSON.stringify(data, 0, 4) + '</pre>');

＆＃13;

Answer 2

你接近你想要达到的目标。这应该可以解决问题：

var arrObj = {
    id: 7,
    activityName: "Drilling",
    parentActivityId: 1,
    items: []
};

function populateObj(data, arrObj) {
   for (var i = 0; i < data.length; i++) {
        if (data[i].id == arrObj.parentActivityId) {
            data[i].items.push(arrObj);
        } else {
            populateObj(data[i].items, arrObj);
        }
    }
};

populateObj(arrObj);

Answer 3

要检查items数组中的对象，你可以这样做，

var objectList = [
        {
            id: 1,
            activityName: "Drilling",
            parentActivityId: 0,
            items: [
                {
                    id: 2,
                    activityName: "Blasting",
                    parentActivityId: 1,
                    items: [
                        {
                            id: 3,
                            activityName: "Ann",
                            parentActivityId: 2,
                            items: [],

                        },
                        {
                            id: 4,
                            activityName: "Ann",
                            parentActivityId: 2,
                            items: [],

                        },
                    {
                         id: 7,
                         activityName: "Drilling",
                         parentActivityId: 2,
                         items: [],
                     }
                    ]
                },
                {
                    id: 5,
                    activityName: "Transport",
                    parentActivityId: 1,
                    items: [
                        {
                            id: 6,
                            activityName: "Daniel",
                            parentActivityId: 5,
                            items: [],
                        }
                    ]
                }
            ]
        }
    ];

var arrObj = {
    id: 7,
    activityName: "Drilling",
    parentActivityId: 1,
    items: []
};

function populateObj(ItemList) {
   for (var i = 0; i < ItemList.length; i++) {
        if (ItemList[i].id == arrObj.parentActivityId) {
            ItemList[i].items.push(arrObj);
        }
       else
       {
         populateObj(ItemList[i].items);
       }
    }
};

populateObj(objectList);

通过在javascript中标识对象的父ID，无法将对象推送到父数组中

3 个答案: