Question

我的json数据如下：

[
  {
    "id": "i_1",
    "name": "abc",
    "address": [
      {
        "city": [
          "city1",
          "city2"
        ]
      },
      {
        "city": [
          "city1",
          "city2"
        ]
      }
    ]
  },
  {
    "id": "i_2",
    "name": "def",
    "address": [
      {
        "city": []
      },
      {
        "city": []
      }
    ]
  }
]

现在，我只希望city数组不是null的那些数据。因此，在上面的示例中，输出应为第一个元素，即ID为i_1。

如何使用jmespath库过滤此json？

Answer 1

您可以这样做：

var arr = [
  {
    "id": "i_1",
    "name": "abc",
    "address": [
      {
        "city": [
          "city1",
          "city2"
        ]
      },
      {
        "city": [
          "city1",
          "city2"
        ]
      }
    ]
  },
  {
    "id": "i_2",
    "name": "def",
    "address": [
      {
        "city": []
      },
      {
        "city": []
      }
    ]
  }
];

console.log(jmespath.search(arr,"[?not_null(address[].city[])]"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/jmespath/0.15.0/jmespath.js"></script>

Answer 2

您可以使用filter和every在纯JavaScript中完成此操作

const items=[{"id":"i_1","name":"abc","address":[{"city":["city1","city2"]},{"city":["city1","city2"]}]},{"id":"i_2","name":"def","address":[{"city":[]},{"city":[]}]}]

const filtered = items.filter(i => i.address.every(a => a.city && a.city.length > 0))

console.log(filtered)

仅当address中的每个对象具有非空的城市数组时，此函数才返回。

Answer 3

您不需要使用 jmespath库，也可以使用filter和`香草JS中的所有内容。效率更高。

let jsonTxt = '{"data":[{"id":"i_1","name":"abc","address":[{"city":["city1","city2"]},{"city":["city1","city2"]}]},{"id":"i_2","name":"def","address":[{"city":[]},{"city":[]}]}]}'

let jsonData = JSON.parse(jsonTxt);
let items = jsonData.data;
const result = items.filter(i => i.address.every(a => a.city && a.city.length))
console.log('id: ', result[0].id);
//using jmespath
console.log(jmespath.search({data: items}, "data[*].address[*].city"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/jmespath/0.15.0/jmespath.js"></script>

Answer 4

var arr = [
  {
    "id": "i_1",
    "name": "abc",
    "address": [
      {
        "city": [
          "city1",
          "city2"
        ]
      },
      {
        "city": [
          "city1",
          "city2"
        ]
      }
    ]
  },
  {
    "id": "i_2",
    "name": "def",
    "address": [
      {
        "city": []
      },
      {
        "city": []
      }
    ]
  }
];
console.log(jmespath.search({ c: arr}, "not_null(c[].address[].city[])"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/jmespath/0.15.0/jmespath.js"></script>

我不知道你的结果如何。你能解释得更好吗？

如何使用jmespath检查json数据中的数组是否为空？

4 个答案: