嵌套JSON，使用angularjs根据Jquery中的条件删除对象

Question

我在这个变量 $scope.bbTreeData 中有一个 JSON 对象。我正在尝试删除标志为假的对象。我能够遍历嵌套的 JSON 对象，但我不确定如何删除该对象？有什么建议吗？

[{
  "market": "Atl",
  "subItem": [{
    "comment_id": "1",
    "user_id": "32509",
    "flag": true
  }, {
    "comment_id": "2",
    "user_id": "32510",
    "flag": false

  }]
}, {
  "market": "Chicago",
  "subItem": [{
    "comment_id": "3",
    "user_id": "32501",
    "flag": true
  }, {
    "comment_id": "4",
    "user_id": "32502",
    "flag": false

  }]
}]

$scope.bbTreeInactiveData = angular.copy($scope.bbTreeData);
angular.forEach($scope.bbTreeInactiveData, function(item) {
  angular.forEach(item.subItem, function(record, index) {
    if (record.flag == false) {
      console.log(item.subItem, index);
      /* code to remove the object*/
    }
  });
});

Answer 1

你可以使用_underscorejs的_without()函数

见documentation

没有
_.without(array, 值)

返回删除所有值实例的数组副本。

_.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
=> [2, 3, 4]

输入

[
    {
        "market": "Atl",
        "subItem": [
            {
                "comment_id": "1",
                "user_id": "32509",
                "flag": true
            },
            {
                "comment_id": "2",
                "user_id": "32510",
                "flag": false
            }
        ]
    },
    {
        "market": "Chicago",
        "subItem": [
            {
                "comment_id": "3",
                "user_id": "32501",
                "flag": true
            },
            {
                "comment_id": "4",
                "user_id": "32502",
                "flag": false
            }
        ]
    }
]

输出

[
    {
        "market": "Atl",
        "subItem": [
            {
                "comment_id": "1",
                "user_id": "32509",
                "flag": true
            }
        ]
    },
    {
        "market": "Chicago",
        "subItem": [
            {
                "comment_id": "3",
                "user_id": "32501",
                "flag": true
            }
        ]
    }
]

代码片段

var json = JSON.parse('[{"market":"Atl","subItem":[{"comment_id":"1","user_id":"32509","flag":true},{"comment_id":"2","user_id":"32510","flag":false}]},{"market":"Chicago","subItem":[{"comment_id":"3","user_id":"32501","flag":true},{"comment_id":"4","user_id":"32502","flag":false}]}]');

for(var i=0; i<json.length; i++) {
    json[i].subItem = _.without(json[i].subItem, _.findWhere(json[i].subItem, {flag: false}));
};

console.log(JSON.stringify(json, 0, 8));

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>

Answer 2

试试这个：

$scope.bbTreeInactiveData = angular.copy($scope.bbTreeData);

var results = $scope.bbTreeInactiveData.map(function(row) {
  return row.subItem.filter(function(cell) {
    return cell.flag == true
  });
});

使用map() 和filter() 函数。

Answer 3

您可以在纯 JavaScript 中使用 delete 关键字：

delete item.subItem[index]

我相信已经有答案了：How do I remove a property from a JavaScript object?

如果你想删除根，在你的第一个forEach添加一个索引参数，然后用数组拼接函数删除根：

$scope.bbTreeInactiveData.splice(indexRoot,1);