The powerful combination of Vue and Excel: how to implement batch import and export of data

The powerful combination of Vue and Excel: How to implement batch import and export of data

Importing and exporting data is a common function in many applications, especially when managing large amounts of data. With the powerful combination of Vue and Excel, we can easily import and export data in batches. This article will introduce you how to use Vue and Excel.js libraries to achieve this function, and attach code examples for reference.

First, we need to introduce the Excel.js library. The library can be installed through npm. The command is as follows:

npm install exceljs

Then, introduce the Excel.js library into the Vue component:

import ExcelJS from 'exceljs'

Next, let’s take a look at how to implement the data export function. Suppose we have an array students containing student information and we want to export it to an Excel file. In the Vue component, we can define a method exportData to implement the export function:

exportData() {
  const workbook = new ExcelJS.Workbook()
  const worksheet = workbook.addWorksheet('Students')

  // 添加表头
  worksheet.addRow(['姓名', '年龄'])

  // 添加数据
  this.students.forEach(student => {
    worksheet.addRow([student.name, student.age])
  })

  // 导出Excel文件
  workbook.xlsx.writeBuffer().then(buffer => {
    const blob = new Blob([buffer], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' })
    const url = window.URL.createObjectURL(blob)
    const link = document.createElement('a')
    link.href = url
    link.download = 'students.xlsx'
    link.click()
    window.URL.revokeObjectURL(url)
  })
}

In the above code, we first create an Excel workbook (workbook), and then add a worksheet (worksheet) to it. Next, we add headers and data. Before exporting the Excel file, we write the contents of the Excel workbook into the Buffer and convert the Buffer into a Blob object. Finally, we create an a tag, set the href attribute to the URL of the Blob object, set the download attribute to the file name, and simulate clicking the a tag to download the file.

Now that we have implemented the data export function, let us take a look at how to implement the data import function. Suppose we have a file input box for uploading Excel files, and we want to save the imported data into an array. In the Vue component, we can define a method importData to implement the import function:

importData(event) {
  const file = event.target.files[0]
  const reader = new FileReader()

  reader.onload = () => {
    const buffer = reader.result
    const workbook = new ExcelJS.Workbook()

    workbook.xlsx.load(buffer).then(() => {
      const worksheet = workbook.getWorksheet('Students')
      const students = []

      for (let i = 2; i <= worksheet.rowCount; i++) {
        const name = worksheet.getCell(`A${i}`).value
        const age = worksheet.getCell(`B${i}`).value
        students.push({ name, age })
      }

      // 在这里可以对导入的数据进行处理
      console.log(students)
    })
  }

  reader.readAsArrayBuffer(file)
}

In the above code, we first obtain the Excel file selected by the user and create a FileReader object. We then read the file into an ArrayBuffer using the readAsArrayBuffer method of the FileReader object. Next, we use the load method of the Excel.js library to load the ArrayBuffer into the Excel workbook. Then, we get the worksheet and iterate through the data for each row, saving the name and age into the students array. In practical applications, we can perform some processing on the data before saving it. Finally, we print out the imported data.

Through the above code examples, we have seen how to use Vue and the Excel.js library to implement the batch import and export function of data. Now we can apply it to our projects to improve the efficiency and accuracy of data processing.

Summary of key points:

1. Use npm to install the Excel.js library: npm install exceljs.
2. Introduce the Excel.js library into the Vue component: import ExcelJS from 'exceljs'.
3. Implement the data export function: use the Excel workbook object to create the header and data, write the workbook content into the Buffer and export the Excel file.
4. Implement the data import function: obtain the uploaded Excel file, use the FileReader object to read the file into an ArrayBuffer, use the Excel workbook object to load the ArrayBuffer and obtain the worksheet data, process the data and save it to the array.

I hope this article will help you understand the use of Vue and Excel.js to implement batch import and export of data. Good luck developing more powerful applications using Vue and the Excel.js library!

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