javascript - 如何重新排列 CSV/JSON 键列？(Javascript)

Question

我正在使用 Papa Parse JavaScript 库将 JSON 对象数组转换为 CSV。有没有办法让 CSV 列以某种方式排列。

例如；我得到的专栏是：

OrderStatus、canOp、OpDesc、ID、OrderNumber、FinishTime、UOM、StartTime

但想安排为：

ID、OrderNumber、OrderStatus、StartTime、FinishTime、canOp、OpDesc、UOM

我将 CSV 设为未排列的原因是因为 JSON 数据如下所示：

json = [
{
    OrderStatus: "Good",
    canOp:"True",
    OpDesc:"Good to go",
    ID:"100",
    OrderNumber:"1000101",
    FinishTime:"20:50",
    UOM:"K",
    StartTime:"18:10"
},
...
]

谢谢

Answer 1

Papa Parse 允许在unparse()函数中指定字段的顺序：

var csv = Papa.unparse({
  fields: ["ID", "OrderNumber", "OrderStatus", "StartTime", "FinishTime", "canOp", "OpDesc", "UOM"],
  data: [{
      OrderStatus: "Good",
      canOp: "True",
      OpDesc: "Good to go",
      ID: "100",
      OrderNumber: "1000101",
      FinishTime: "20:50",
      UOM: "K",
      StartTime: "18:10"
    },
    // ...
  ]
});

console.log(csv);

<script src="https://unpkg.com/papaparse@4.6.3/papaparse.min.js"></script>
<h3>See your dev console for the results</h3>

Answer 2

您不需要任何框架即可将 json 转换为 csv。

// fields in the order you want them
const fields = ['ID', 'OrderNumber', 'OrderStatus', 'StartTime', 'FinishTime', 'canOp', 'OpDesc', 'UOM'];
const mapper = (key, value) => value === null ? '' : value // how to handle null values
const csv = [
  fields.join(','), // header row
  ...json.map((row) => fields.map((fieldName) => JSON.stringify(row[fieldName], mapper))).join(',')
]
console.log(csv.join('\r\n'))

输出：

ID,OrderNumber,OrderStatus,StartTime,FinishTime,canOp,OpDesc,UOM
"100","1000101","Good","18:10","20:50","True","Good to go","K"
"100","1000101","Good","18:10","20:50","True","Good to go","K"