创建excel文件并用ExcelJS写入

Question

我写了一个脚本，用 ExcelJS 创建一个新的 excel 文件。添加 3 个标题并插入 2 行。然后将该文件保存到磁盘。

在下一步中，它应该读取先前保存的文件，添加 1 行并以新名称再次保存。我找不到我尝试添加第三行的第二部分从未发生的原因。两个文件看起来相同，控制台中没有错误。

const Excel = require('exceljs');

async function exTest(){
  const workbook = new Excel.Workbook();
  const worksheet = workbook.addWorksheet("My Sheet");

worksheet.columns = [
  {header: 'Id', key: 'id', width: 10},
  {header: 'Name', key: 'name', width: 32}, 
  {header: 'D.O.B.', key: 'dob', width: 15,}
];

worksheet.addRow({id: 1, name: 'John Doe', dob: new Date(1970, 1, 1)});
worksheet.addRow({id: 2, name: 'Jane Doe', dob: new Date(1965, 1, 7)});

// save under export.xlsx
await workbook.xlsx.writeFile('export.xlsx');

// load a copy of export.xlsx
const newWorkbook = new Excel.Workbook();
await newWorkbook.xlsx.readFile('export.xlsx');

const newworksheet = newWorkbook.getWorksheet('My Sheet');
newworksheet.addRow(
  {id: 3, name: 'New Guy', dob: new Date(2000, 1, 1)}
);

await newWorkbook.xlsx.writeFile('export2.xlsx');

console.log("File is written");
};

exTest();

Answer 1

通过在代码的第二部分添加数组来描述列来解决它。然后第三行添加成功。将带有列名的对象传递给addRow()我时，我必须提供对 excel 文件中已存在的列的描述。

const Excel = require('exceljs');

async function exTest(){
  const workbook = new Excel.Workbook();
  const worksheet = workbook.addWorksheet("My Sheet");

worksheet.columns = [
 {header: 'Id', key: 'id', width: 10},
 {header: 'Name', key: 'name', width: 32}, 
 {header: 'D.O.B.', key: 'dob', width: 15,}
];

worksheet.addRow({id: 1, name: 'John Doe', dob: new Date(1970, 1, 1)});
worksheet.addRow({id: 2, name: 'Jane Doe', dob: new Date(1965, 1, 7)});

// save under export.xlsx
await workbook.xlsx.writeFile('export.xlsx');

//load a copy of export.xlsx
const newWorkbook = new Excel.Workbook();
await newWorkbook.xlsx.readFile('export.xlsx');

const newworksheet = newWorkbook.getWorksheet('My Sheet');
newworksheet.columns = [
 {header: 'Id', key: 'id', width: 10},
 {header: 'Name', key: 'name', width: 32}, 
 {header: 'D.O.B.', key: 'dob', width: 15,}
];
await newworksheet.addRow({id: 3, name: 'New Guy', dob: new Date(2000, 1, 1)});

await newWorkbook.xlsx.writeFile('export2.xlsx');

console.log("File is written");

};

exTest();

Answer 2

附上工作链接

const Excel = require('exceljs');

// Create workbook & add worksheet
const workbook = new Excel.Workbook();
const worksheet = workbook.addWorksheet('ExampleSheet');

// add column headers
worksheet.columns = [
  { header: 'Package', key: 'package_name' },
  { header: 'Author', key: 'author_name' }
];

// Add row using key mapping to columns
worksheet.addRow(
  { package_name: "ABC", author_name: "Author 1" },
  { package_name: "XYZ", author_name: "Author 2" }
);

// Add rows as Array values
worksheet
  .addRow(["BCD", "Author Name 3"]);

// Add rows using both the above of rows
const rows = [
  ["FGH", "Author Name 4"],
  { package_name: "PQR", author_name: "Author 5" }
];


worksheet
  .addRows(rows);

// save workbook to disk
workbook
  .xlsx
  .writeFile('sample.xlsx')
  .then(() => {
    console.log("saved");
  })
  .catch((err) => {
    console.log("err", err);
  });

https://repl.it/@vishwasc/ExcelJs-Example#index.js

图片附件

// add image to workbook by filename
const imageId1 = workbook.addImage({
  filename: 'path/to/image.jpg',
  extension: 'jpeg',
});

// add image to workbook by buffer
const imageId2 = workbook.addImage({
  buffer: fs.readFileSync('path/to.image.png'),
  extension: 'png',
});

// add image to workbook by base64
const myBase64Image = "data:image/png;base64,iVBORw0KG...";
const imageId2 = workbook.addImage({
  base64: myBase64Image,
  extension: 'png',
});

请注意，在这两种情况下，都必须指定扩展名。有效的扩展值包括“jpeg”、“png”、“gif”。