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。 有没有办法以某种方式排列 CSV 列。

例如; 我得到的列是：

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

但想安排为：

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

我得到 CSV 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unparse() ：

 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从 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"