vue之 上传 excel文件

父组件

    <upload-excel-component :on-success="handleSuccess" :before-upload="beforeUpload" />
    <button @click="reset">重置</button>
    <el-table :data="excelTableData" border highlight-current-row style="width: 100%;margin-top:20px;">
      <el-table-column v-for="item of tableHeader" :key="item" :prop="item" :label="item" />
    </el-table>

  data() {
    return {
      excelTableData: [],
      tableHeader: [],
    }
  }

  methods: {
    // 上传文件前
    beforeUpload(file) {
      // console.log('beforeUpload-file', file) // 上传文件之前 对文件的数据 进行校验（必填 || 文件大小）
      const isLt1M = file.size / 1024 / 1024 < 1
      if (isLt1M) {
        return true
      }
      this.$message({
        message: '请导入文件不超过1M的',
        type: 'warning'
      })
      return false
    },
    // 上传成功
    handleSuccess({ results, header }) {
      // console.log('上传成功', results, 'header', header)
      this.excelTableData = results
      this.tableHeader = header
    },
    // 重置 上传数据
    reset() {
      this.excelTableData = []
      this.tableHeader = []
    },
 }

UploadExcel.vue

<template>
  <div>
    <input ref="excel-upload-input" class="excel-upload-input" type="file" accept=".xlsx, .xls" @change="handleClick">
    <div class="drop" @drop="handleDrop" @dragover="handleDragover" @dragenter="handleDragover">
      Drop excel file here or
      <el-button :loading="loading" style="margin-left:16px;" size="mini" type="primary" @click="handleUpload">
        上传excel
      </el-button>
    </div>
  </div>
</template>

<script>
import * as XLSX from 'xlsx'

export default {
  props: {
    beforeUpload: Function, // eslint-disable-line
    onSuccess: Function // eslint-disable-line
  },
  data() {
    return {
      loading: false, // 上传 按钮的loading
      excelData: {
        header: null,
        results: null
      }
    }
  },
  methods: {
    // 功能2：2-1拖拽文件上传
    handleDrop(e) {
      // console.log('handleDrop-e', e)
      e.stopPropagation()
      e.preventDefault()
      if (this.loading) return
      const files = e.dataTransfer.files
      if (files.length !== 1) {
        this.$message.error('仅仅支持一个文件上传')
        return
      }
      const rawFile = files[0] // only use files[0]

      if (!this.isExcel(rawFile)) {
        this.$message.error('仅仅支持上传的文件类型： .xlsx, .xls, .csv')
        return false
      }
      this.upload(rawFile)
      e.stopPropagation()
      e.preventDefault()
    },
    // 功能2：2-2拖拽完毕
    handleDragover(e) {
      // console.log('handleDragover-e', e)
      e.stopPropagation()
      e.preventDefault()
      e.dataTransfer.dropEffect = 'copy'
    },
    // 功能1：手动上传： 1-1 手动上传 excel
    handleUpload() {
      this.$refs['excel-upload-input'].click() // 调用上传文件的入口（弹窗）
    },
    // 功能1：手动上传： 1-2 手动上传文件 触发的方法
    handleClick(e) {
      // console.log('handleClick-e', e, 'e.target.files[0]', e.target.files[0])
      const files = e.target.files
      const rawFile = files[0] // 拿到具体的 上传文件内容 可以进行判断上传的文件 相关！
      if (!rawFile) return
      this.upload(rawFile)
    },
    // 03：触发上传文件 rawFile- 为上传的文件
    upload(rawFile) {
      // console.log('upload-', rawFile)
      this.$refs['excel-upload-input'].value = null // 修复程序无法选择 相同的excel
      if (!this.beforeUpload) { // 上传前的函数 （在父组件之中 进行校验文件）
        this.readerData(rawFile)
        return
      }
      const before = this.beforeUpload(rawFile)
      if (before) {
        this.readerData(rawFile)
      }
    },
    // 04：渲染数据
    readerData(rawFile) {
      // console.log('readerData', rawFile)
      this.loading = true
      return new Promise((resolve, reject) => {
        const reader = new FileReader() // excel 文件渲染
        reader.onload = e => {
          const data = e.target.result
          const workbook = XLSX.read(data, { type: 'array' })
          const firstSheetName = workbook.SheetNames[0]
          const worksheet = workbook.Sheets[firstSheetName]
          const header = this.getHeaderRow(worksheet)
          const results = XLSX.utils.sheet_to_json(worksheet)
          this.generateData({ header, results })
          this.loading = false
          resolve()
        }
        reader.readAsArrayBuffer(rawFile)
      })
    },
    // 获取 上传的excel文件的 头部数据
    getHeaderRow(sheet) {
      // console.log('getHeaderRow', sheet)
      const headers = []
      const range = XLSX.utils.decode_range(sheet['!ref'])
      let C
      const R = range.s.r
      /* start in the first row */
      for (C = range.s.c; C <= range.e.c; ++C) {
        /* walk every column in the range */
        const cell = sheet[XLSX.utils.encode_cell({ c: C, r: R })]
        /* find the cell in the first row */
        let hdr = 'UNKNOWN ' + C // <-- replace with your desired default
        if (cell && cell.t) hdr = XLSX.utils.format_cell(cell)
        headers.push(hdr)
      }
      return headers
    },
    // 获取上传 excel 上传 表头数据、表体数据
    generateData({ header, results }) {
      // console.log('generateData-', header, results)
      this.excelData.header = header
      this.excelData.results = results
      this.onSuccess && this.onSuccess(this.excelData) // 调用上传成功
    },
    isExcel(file) {
      return /\.(xlsx|xls|csv)$/.test(file.name)
    }
  }
}
</script>

<style scoped>
.excel-upload-input {
  display: none;
  z-index: -9999;
}
.drop {
  border: 2px dashed #bbb;
  width: 600px;
  height: 160px;
  line-height: 160px;
  margin: 0 auto;
  font-size: 24px;
  border-radius: 5px;
  text-align: center;
  color: #bbb;
  position: relative;
}
</style>

效果