封装组件实现 Excel 导入数据

组件依赖 element 和xlsx,该 xlsx 版本为

: “xlsx”: “^0.18.5”

组件

<template>
  <div class="upload-excel">
    <!-- <div class="btn-upload"> -->
      <el-button
        :loading="loading"
        size="mini"
        type="primary"
        @click="handleUpload"
      >
        点击上传
      </el-button>
    <!-- </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"
    >
      <i class="el-icon-upload" />
      <span>将文件拖到此处</span>
    </div> -->
  </div>
</template>

<script>
import * as XLSX from 'xlsx'

export default {
  name:'UploadExcel',
  props: {
    beforeUpload: Function, // eslint-disable-line
    onSuccess: Function // eslint-disable-line
  },
  data() {
    return {
      loading: false,
      excelData: {
        header: null,
        results: null
      }
    }
  },
  methods: {
    generateData({ header, results }) {
      this.excelData.header = header
      this.excelData.results = results
      this.onSuccess && this.onSuccess(this.excelData)
    },
    handleUpload() {
      this.$refs['excel-upload-input'].click()
    },
    handleClick(e) {
      const files = e.target.files
      const rawFile = files[0] // only use files[0]
      if (!rawFile) return
      this.upload(rawFile)
    },
    upload(rawFile) {
      this.$refs['excel-upload-input'].value = null // fix can't select the same excel

      if (!this.beforeUpload) {
        this.readerData(rawFile)
        return
      }
      const before = this.beforeUpload(rawFile)
      if (before) {
        this.readerData(rawFile)
      }
    },
    readerData(rawFile) {
      this.loading = true
      return new Promise((resolve) => { // , reject
        const reader = new FileReader()
        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 })
          setTimeout(()=>{
            this.loading = false
          },500)
          resolve()
        }
        reader.readAsArrayBuffer(rawFile)
      })
    },
    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
    },
    isExcel(file) {
      return /\.(xlsx|xls|csv)$/.test(file.name)
    },

    // 拖拽导入
/*         handleDrop(e) {
      e.stopPropagation()
      e.preventDefault()
      if (this.loading) return
      const files = e.dataTransfer.files
      if (files.length !== 1) {
        this.$message.error('Only support uploading one file!')
        return
      }
      const rawFile = files[0] // only use files[0]

      if (!this.isExcel(rawFile)) {
        this.$message.error(
          'Only supports upload .xlsx, .xls, .csv suffix files'
        )
        return false
      }
      this.upload(rawFile)
      e.stopPropagation()
      e.preventDefault()
    },
    handleDragover(e) {
      e.stopPropagation()
      e.preventDefault()
      e.dataTransfer.dropEffect = 'copy'
    }, */
  }
}
</script>

<style scoped lang="scss">
.upload-excel {
  // display: flex;
  // justify-content: center;
  // margin-top: 100px;
  .excel-upload-input {
    display: none;
    z-index: -9999;
  }
  .btn-upload,
  .drop {
    border: 1px dashed #bbb;
    width: 350px;
    height: 160px;
    text-align: center;
    line-height: 160px;
  }
  .drop {
    padding-top: 20px;
    line-height: 80px;
    color: #bbb;
    i {
      font-size: 60px;
      display: block;
    }
  }
}
</style>

导入组件使用:

<template>
  <UploadExcel :on-success="handleSuccess" :before-upload="beforeUpload" />
</template>

<script>
import UploadExcel from '@/components/UploadExcel/index.vue'
export default {
  name: 'importexcel',
  computed: {},
  components:{
    UploadExcel
  },
  methods: {
    async handleSuccess({ header, results }) {
      // console.log(results)
      const userRelations = { // 传入对比值
        日期: 'timeOfEntry',
        手机号: 'mobile',
        姓名: 'username',
        转正: 'correctionTime',
        工号: 'workNumber'
      }
      const arr = []
      results.forEach((item) => {
        const userInfo = {}
        for (const key in item) {
          if (['timeOfEntry', 'correctionTime'].includes(userRelations[key])) {
            userInfo[userRelations[key]] = this.formatExcelDate(item[key], '-')
          } else {
            userInfo[userRelations[key]] = item[key]
          }
        }
        arr.push(userInfo)
      })
      console.log(arr) // 转换完的数据
      // 调用导入接口
      // await --------- // 调用导入接口
      // this.$router.push('/employees')
    },
    formatExcelDate(numb, format) {
      const time = new Date((numb - 1) * 24 * 3600000 + 1)
      time.setYear(time.getFullYear() - 70)
      const year = time.getFullYear() + ''
      const month = time.getMonth() + 1 + ''
      const date = time.getDate() - 1 + ''
      if (format && format.length === 1) {
        return (
          year +
          format +
          (month < 10 ? '0' + month : month) +
          format +
          (date < 10 ? '0' + date : date)
        )
      }
      return (
        year +
        (month < 10 ? '0' + month : month) +
        (date < 10 ? '0' + date : date)
      )
    },
    beforeUpload(file) {  // 大小限制
      // console.log('数据检测', file)
      const isLit1m = file.size / 1024 / 1024 < 1
      if (isLit1m) return true

      this.$message.success('成功')
      return false
    }
  }
}
</script>

<style lang="scss" scoped></style>