封装excel表格导入组件

组件A 复制即可

"xlsx": "^0.14.1" 如何没有安装xlsx自行安装

<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"> 导入 </el-button>
      <slot />
    </div>
  </div>
</template>

<script>
import XLSX from "xlsx";

export default {
  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);
    },
    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.$message.error("Only supports upload .xlsx, .xls, .csv suffix files");
        return false;
      }
      this.upload(rawFile);
      e.stopPropagation();
      e.preventDefault();
    },
    handleDragover(e) {
      e.stopPropagation();
      e.preventDefault();
      e.dataTransfer.dropEffect = "copy";
    },
    handleUpload() {
      this.$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 });
          this.loading = false;
          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);
    }
  }
};
</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>

html

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

js

 beforeUpload(file) {
      const isLt1M = file.size / 1024 / 1024 < 1;
      const typeArry = [".xlsx", ".xls"];
      const type = file.name.substring(file.name.lastIndexOf("."));
      const isImage = typeArry.indexOf(type) > -1;
      if (isLt1M && isImage) {
        return true;
      }
      if (!isLt1M) {
        this.$message.warning("文件大小不允许超出2MB");
      }
      if (!isImage) {
        this.$message.warning("上传文件必须为excel");
      }
      return false;
    },
    
   async handleSuccess({ results, header }) {
      // results 就是导入的数据
   }