JavaScript:使用动态键值解析 JSON

Question

我有一个如下所示的 JSON，我想从中提取列和行数组中的数据。

{
  "id":0,
  "tabName":"newtab",
  "columns":[
    {
      "id":0,
      "name":"firstname",
      "type":"entity",
      "operator":"=",
      "$$hashKey":"object:40"
    },
    {
      "id":1,
      "name":"address",
      "type":"domain",
      "operator":"<",
      "$$hashKey":"object:50"
    }
  ],
"rows":[
  {
    "0":"Adam", //this first row data corresponds to "Name" column
    "1":"5432 River Drive", //this first row data corresponds to "Address" column
    "$$hashKey":"object:34",
    "tabId":"1122", 
    "description":"New Tab",
    "id":1
  },
  {
    "0":"Silver",  //this 2nd row data corresponds to "Name" column
    "1":"Address 2", //this 2nd row data corresponds to "Address" column
    "$$hashKey":"object:53",
    "tabId":"2345",
    "description":"New 2nd Tab",
    "id":2
  }
],
"uniqueIdCounter":3
}

从上面的 JSON 中，我想提取列和行值。这只是示例 JSON，实际的 JSON 可以有更多的列和行条目。

在列数组中: 每个列条目的 id、名称、类型操作键保持相同。

在行数组中: 每个行条目的 tabid、描述和 id 键保持相同。

行数组的问题是键值“0”、“1”(实际上对应于列名字和地址)。如何循环遍历这个数组并提取这些动态值？所谓动态，是指如果我有超过 2 行，则行中的键将为“0”、“1”、“2”，对于其他行，依此类推。

我开始编写这个循环:

var jsonColumns = JSON.parse(JSON.stringify($scope.myTable.columns));
for (var i = 0; i < jsonColumns.length; i++) {
    var obj = jsonColumns[i]; 
    //For columns data I can do obj.id, obj.name etc and works fine
}

对于行，我不确定如何继续:

var jsonRows = JSON.parse(JSON.stringify($scope.myTable.rows));
for (var i = 0; i < jsonRows.length; i++) {
    var obj = jsonRows[i]; 
    //How can I extract rows with keys "0", "1" where I dont know these key names in advance
}

请问对此有何意见？谢谢

Answer 1

假设 tabid、description、id 和 $$hashKey 是静态的，您可以按如下方式提取这些动态键，

let tableObj = {
  "id":0,
  "tabName":"newtab",
  "columns":[
    {
      "id":0,
      "name":"firstname",
      "type":"entity",
      "operator":"=",
      "$$hashKey":"object:40"
    },
    {
      "id":1,
      "name":"address",
      "type":"domain",
      "operator":"<",
      "$$hashKey":"object:50"
    }
  ],
"rows":[
  {
    "0":"Adam", //this first row data corresponds to "Name" column
    "1":"5432 River Drive", //this first row data corresponds to "Address" column
    "$$hashKey":"object:34",
    "tabId":"1122", 
    "description":"New Tab",
    "id":1
  },
  {
    "0":"Silver",  //this 2nd row data corresponds to "Name" column
    "1":"Address 2", //this 2nd row data corresponds to "Address" column
    "$$hashKey":"object:53",
    "tabId":"2345",
    "description":"New 2nd Tab",
    "id":2
  }
],
"uniqueIdCounter":3
};

let jsonRows = JSON.parse(JSON.stringify(tableObj.rows));
let staticAttributes = ['tabId', 'description', 'id', '$$hashKey'];
let extractedData = [];
for (const obj of jsonRows) {
    let extractedObj = {};
    
    for (let key in obj) {
      if (obj.hasOwnProperty(key) && !staticAttributes.includes(key)) {
        extractedObj[key] = obj[key];
      }
    }
    
    extractedData.push(extractedObj);
}

console.log(extractedData);