基于element-ui所做的一个Excel导入与导出的Demo

前言

这是一个基于element-ui所做的一个Excel导入与导出的Demo

Demo预览

vue-element-admin Excel 文档

你需要准备几个包

xlsx npm 文档

指定xlsx与file-saver的版本是为了避免你下载的这两个包产生冲突而报错
Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'utils')

npm install xlsx
npm install --s xlsx@0.17.5
npm install --s file-saver@2.0.5

你需要在src同级目录下创建vendor(自定义),放入两个文件

Blob.js

/* eslint-disable */
/* Blob.js
 * A Blob implementation.
 * 2014-05-27
 *
 * By Eli Grey, http://eligrey.com
 * By Devin Samarin, https://github.com/eboyjr
 * License: X11/MIT
 *   See LICENSE.md
 */

/*global self, unescape */
/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
 plusplus: true */

/*! @source http://purl.eligrey.com/github/Blob.js/blob/master/Blob.js */

(function (view) {
    "use strict";

    view.URL = view.URL || view.webkitURL;

    if (view.Blob && view.URL) {
        try {
            new Blob;
            return;
        } catch (e) { }
    }

    // Internally we use a BlobBuilder implementation to base Blob off of
    // in order to support older browsers that only have BlobBuilder
    var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || (function (view) {
        var
            get_class = function (object) {
                return Object.prototype.toString.call(object).match(/^\[object\s(.*)\]$/)[1];
            },
            FakeBlobBuilder = function BlobBuilder() {
                this.data = [];
            },
            FakeBlob = function Blob(data, type, encoding) {
                this.data = data;
                this.size = data.length;
                this.type = type;
                this.encoding = encoding;
            },
            FBB_proto = FakeBlobBuilder.prototype,
            FB_proto = FakeBlob.prototype,
            FileReaderSync = view.FileReaderSync,
            FileException = function (type) {
                this.code = this[this.name = type];
            },
            file_ex_codes = (
                "NOT_FOUND_ERR SECURITY_ERR ABORT_ERR NOT_READABLE_ERR ENCODING_ERR " +
                "NO_MODIFICATION_ALLOWED_ERR INVALID_STATE_ERR SYNTAX_ERR"
            ).split(" "),
            file_ex_code = file_ex_codes.length,
            real_URL = view.URL || view.webkitURL || view,
            real_create_object_URL = real_URL.createObjectURL,
            real_revoke_object_URL = real_URL.revokeObjectURL,
            URL = real_URL,
            btoa = view.btoa,
            atob = view.atob

            ,
            ArrayBuffer = view.ArrayBuffer,
            Uint8Array = view.Uint8Array;
        FakeBlob.fake = FB_proto.fake = true;
        while (file_ex_code--) {
            FileException.prototype[file_ex_codes[file_ex_code]] = file_ex_code + 1;
        }
        if (!real_URL.createObjectURL) {
            URL = view.URL = {};
        }
        URL.createObjectURL = function (blob) {
            var
                type = blob.type,
                data_URI_header;
            if (type === null) {
                type = "application/octet-stream";
            }
            if (blob instanceof FakeBlob) {
                data_URI_header = "data:" + type;
                if (blob.encoding === "base64") {
                    return data_URI_header + ";base64," + blob.data;
                } else if (blob.encoding === "URI") {
                    return data_URI_header + "," + decodeURIComponent(blob.data);
                }
                if (btoa) {
                    return data_URI_header + ";base64," + btoa(blob.data);
                } else {
                    return data_URI_header + "," + encodeURIComponent(blob.data);
                }
            } else if (real_create_object_URL) {
                return real_create_object_URL.call(real_URL, blob);
            }
        };
        URL.revokeObjectURL = function (object_URL) {
            if (object_URL.substring(0, 5) !== "data:" && real_revoke_object_URL) {
                real_revoke_object_URL.call(real_URL, object_URL);
            }
        };
        FBB_proto.append = function (data /*, endings*/) {
            var bb = this.data;
            // decode data to a binary string
            if (Uint8Array && (data instanceof ArrayBuffer || data instanceof Uint8Array)) {
                var
                    str = "",
                    buf = new Uint8Array(data),
                    i = 0,
                    buf_len = buf.length;
                for (; i < buf_len; i++) {
                    str += String.fromCharCode(buf[i]);
                }
                bb.push(str);
            } else if (get_class(data) === "Blob" || get_class(data) === "File") {
                if (FileReaderSync) {
                    var fr = new FileReaderSync;
                    bb.push(fr.readAsBinaryString(data));
                } else {
                    // async FileReader won't work as BlobBuilder is sync
                    throw new FileException("NOT_READABLE_ERR");
                }
            } else if (data instanceof FakeBlob) {
                if (data.encoding === "base64" && atob) {
                    bb.push(atob(data.data));
                } else if (data.encoding === "URI") {
                    bb.push(decodeURIComponent(data.data));
                } else if (data.encoding === "raw") {
                    bb.push(data.data);
                }
            } else {
                if (typeof data !== "string") {
                    data += ""; // convert unsupported types to strings
                }
                // decode UTF-16 to binary string
                bb.push(unescape(encodeURIComponent(data)));
            }
        };
        FBB_proto.getBlob = function (type) {
            if (!arguments.length) {
                type = null;
            }
            return new FakeBlob(this.data.join(""), type, "raw");
        };
        FBB_proto.toString = function () {
            return "[object BlobBuilder]";
        };
        FB_proto.slice = function (start, end, type) {
            var args = arguments.length;
            if (args < 3) {
                type = null;
            }
            return new FakeBlob(
                this.data.slice(start, args > 1 ? end : this.data.length), type, this.encoding
            );
        };
        FB_proto.toString = function () {
            return "[object Blob]";
        };
        FB_proto.close = function () {
            this.size = this.data.length = 0;
        };
        return FakeBlobBuilder;
    }(view));

    view.Blob = function Blob(blobParts, options) {
        var type = options ? (options.type || "") : "";
        var builder = new BlobBuilder();
        if (blobParts) {
            for (var i = 0, len = blobParts.length; i < len; i++) {
                builder.append(blobParts[i]);
            }
        }
        return builder.getBlob(type);
    };
}(typeof self !== "undefined" && self || typeof window !== "undefined" && window || this.content || this));

Export2Excel.js

/* Export2Excel.js */
/* eslint-disable */
import { saveAs } from 'file-saver'
import XLSX from 'xlsx'

function generateArray(table) {
    var out = [];
    var rows = table.querySelectorAll('tr');
    var ranges = [];
    for (var R = 0; R < rows.length; ++R) {
        var outRow = [];
        var row = rows[R];
        var columns = row.querySelectorAll('td');
        for (var C = 0; C < columns.length; ++C) {
            var cell = columns[C];
            var colspan = cell.getAttribute('colspan');
            var rowspan = cell.getAttribute('rowspan');
            var cellValue = cell.innerText;
            if (cellValue !== "" && cellValue == +cellValue) cellValue = +cellValue;

            //Skip ranges
            ranges.forEach(function (range) {
                if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) {
                    for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null);
                }
            });

            //Handle Row Span
            if (rowspan || colspan) {
                rowspan = rowspan || 1;
                colspan = colspan || 1;
                ranges.push({
                    s: {
                        r: R,
                        c: outRow.length
                    },
                    e: {
                        r: R + rowspan - 1,
                        c: outRow.length + colspan - 1
                    }
                });
            };

            //Handle Value
            outRow.push(cellValue !== "" ? cellValue : null);

            //Handle Colspan
            if (colspan)
                for (var k = 0; k < colspan - 1; ++k) outRow.push(null);
        }
        out.push(outRow);
    }
    return [out, ranges];
};

function datenum(v, date1904) {
    if (date1904) v += 1462;
    var epoch = Date.parse(v);
    return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}

function sheet_from_array_of_arrays(data, opts) {
    var ws = {};
    var range = {
        s: {
            c: 10000000,
            r: 10000000
        },
        e: {
            c: 0,
            r: 0
        }
    };
    for (var R = 0; R != data.length; ++R) {
        for (var C = 0; C != data[R].length; ++C) {
            if (range.s.r > R) range.s.r = R;
            if (range.s.c > C) range.s.c = C;
            if (range.e.r < R) range.e.r = R;
            if (range.e.c < C) range.e.c = C;
            var cell = {
                v: data[R][C]
            };
            if (cell.v == null) continue;
            var cell_ref = XLSX.utils.encode_cell({
                c: C,
                r: R
            });

            if (typeof cell.v === 'number') cell.t = 'n';
            else if (typeof cell.v === 'boolean') cell.t = 'b';
            else if (cell.v instanceof Date) {
                cell.t = 'n';
                cell.z = XLSX.SSF._table[14];
                cell.v = datenum(cell.v);
            } else cell.t = 's';

            ws[cell_ref] = cell;
        }
    }
    if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
    return ws;
}

function Workbook() {
    if (!(this instanceof Workbook)) return new Workbook();
    this.SheetNames = [];
    this.Sheets = {};
}

function s2ab(s) {
    var buf = new ArrayBuffer(s.length);
    var view = new Uint8Array(buf);
    for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
    return buf;
}

export function export_table_to_excel(id) {
    var theTable = document.getElementById(id);
    var oo = generateArray(theTable);
    var ranges = oo[1];

    /* original data */
    var data = oo[0];
    var ws_name = "SheetJS";

    var wb = new Workbook(),
        ws = sheet_from_array_of_arrays(data);

    /* add ranges to worksheet */
    // ws['!cols'] = ['apple', 'banan'];
    ws['!merges'] = ranges;

    /* add worksheet to workbook */
    wb.SheetNames.push(ws_name);
    wb.Sheets[ws_name] = ws;

    var wbout = XLSX.write(wb, {
        bookType: 'xlsx',
        bookSST: false,
        type: 'binary'
    });

    saveAs(new Blob([s2ab(wbout)], {
        type: "application/octet-stream"
    }), "test.xlsx")
}

export function export_json_to_excel({
    multiHeader = [],
    header,
    data,
    filename,
    merges = [],
    autoWidth = true,
    bookType = 'xlsx'
} = {}) {
    /* original data */
    filename = filename || 'excel-list'
    data = [...data]
    data.unshift(header);

    for (let i = multiHeader.length - 1; i > -1; i--) {
        data.unshift(multiHeader[i])
    }

    var ws_name = "SheetJS";
    var wb = new Workbook(),
        ws = sheet_from_array_of_arrays(data);

    if (merges.length > 0) {
        if (!ws['!merges']) ws['!merges'] = [];
        merges.forEach(item => {
            ws['!merges'].push(XLSX.utils.decode_range(item))
        })
    }

    if (autoWidth) {
        /*设置worksheet每列的最大宽度*/
        const colWidth = data.map(row => row.map(val => {
            /*先判断是否为null/undefined*/
            if (val == null) {
                return {
                    'wch': 10
                };
            }
            /*再判断是否为中文*/
            else if (val.toString().charCodeAt(0) > 255) {
                return {
                    'wch': val.toString().length * 2
                };
            } else {
                return {
                    'wch': val.toString().length
                };
            }
        }))
        /*以第一行为初始值*/
        let result = colWidth[0];
        for (let i = 1; i < colWidth.length; i++) {
            for (let j = 0; j < colWidth[i].length; j++) {
                if (result[j]['wch'] < colWidth[i][j]['wch']) {
                    result[j]['wch'] = colWidth[i][j]['wch'];
                }
            }
        }
        ws['!cols'] = result;
    }

    /* add worksheet to workbook */
    wb.SheetNames.push(ws_name);
    wb.Sheets[ws_name] = ws;

    var wbout = XLSX.write(wb, {
        bookType: bookType,
        bookSST: false,
        type: 'binary'
    });
    saveAs(new Blob([s2ab(wbout)], {
        type: "application/octet-stream"
    }), `${filename}.${bookType}`);
}

导入

可拖拽导入参考地址
Github 代码如下

<template>
  <div class="app-container">
    <upload-excel-component :on-success="handleSuccess" :before-upload="beforeUpload" />
    <el-table :data="tableData" 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>
  </div>
</template>

<script>
import UploadExcelComponent from '@/components/UploadExcel/index.vue'

export default {
  name: 'UploadExcel',
  components: { UploadExcelComponent },
  data() {
    return {
      tableData: [],
      tableHeader: []
    }
  },
  methods: {
    beforeUpload(file) {
      const isLt1M = file.size / 1024 / 1024 < 1

      if (isLt1M) {
        return true
      }

      this.$message({
        message: 'Please do not upload files larger than 1m in size.',
        type: 'warning'
      })
      return false
    },
    handleSuccess({ results, header }) {
      this.tableData = results
      this.tableHeader = header
    }
  }
}
</script>

我把button给单独提了出来,方便使用,组件代码如下:

<template>
  <div>
    <input
      ref="excel-upload-input"
      class="excel-upload-input"
      type="file"
      accept=".xlsx, .xls"
      @change="handleClick"
    />
    <el-button
      :loading="loading"
      style="margin-left: 16px"
      type="primary"
      @click="handleUpload"
    >
      选择Excel
    </el-button>
  </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);
    },
    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 {
  margin: 0 auto;
  font-size: 24px;
  border-radius: 5px;
  text-align: center;
  color: #bbb;
  position: relative;
}
</style>

导出

 handleDownload() {
      this.downloadLoading = true;
      import("@/vendor/Export2Excel").then((excel) => {
        const tHeader = ["date", "name", "address"]; // 表头
        const filterVal = ["date", "name", "address"];
        const list = this.tableData;
        const data = this.formatJson(filterVal, list);
        excel.export_json_to_excel({
          header: tHeader,
          data,
          filename: this.filename,
        });
        this.downloadLoading = false;
      });
    },
    formatJson(filterVal, jsonData) {
      return jsonData.map((v) =>
        filterVal.map((j) => {
          if (j === "timestamp") {
            return parseTime(v[j]);
          } else {
            return v[j];
          }
        })
      );
    },

使用

<template>
  <div>
    <FilenameOption v-model="filename" />
    <upload-excel-component
      style="margin-top: 20px"
      :on-success="handleSuccess"
      :before-upload="beforeUpload"
    />

    <!-- 导入组件 -->
    <UploadButton
      style="margin-top: 20px"
      :on-success="handleSuccess"
      :before-upload="beforeUpload"
    />

    <!-- 导出 -->
    <el-button
      :loading="downloadLoading"
      style="margin: 20px 0 20px 20px"
      type="primary"
      icon="el-icon-document"
      @click="handleDownload"
    >
      导出Excel
    </el-button>
    <el-table :data="tableData" style="width: 100%" ref="exportTableData">
      <el-table-column prop="date" label="日期" width="180"> </el-table-column>
      <el-table-column prop="name" label="姓名" width="180"> </el-table-column>
      <el-table-column prop="address" label="地址"> </el-table-column>
    </el-table>
  </div>
</template>
<script>
import FilenameOption from "./components/FilenameOption.vue";
import UploadExcelComponent from "@/components/UploadExcel/index.vue";
import UploadButton from "@/components/UploadExcel/UploadButton.vue";
export default {
  components: { FilenameOption, UploadExcelComponent, UploadButton },
  data() {
    return {
      downloadLoading: false,
      tableData: [
        {
          date: "2016-05-02",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1517 弄",
        },
        {
          date: "2016-05-01",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1519 弄",
        },
        {
          date: "2016-05-03",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1516 弄",
        },
      ],
      filename: "",
    };
  },
  methods: {
    handleDownload() {
      this.downloadLoading = true;
      import("@/vendor/Export2Excel").then((excel) => {
        const tHeader = ["date", "name", "address"]; // 表头
        const filterVal = ["date", "name", "address"];
        const list = this.tableData;
        const data = this.formatJson(filterVal, list);
        excel.export_json_to_excel({
          header: tHeader,
          data,
          filename: this.filename,
        });
        this.downloadLoading = false;
      });
    },
    formatJson(filterVal, jsonData) {
      return jsonData.map((v) =>
        filterVal.map((j) => {
          if (j === "timestamp") {
            return parseTime(v[j]);
          } else {
            return v[j];
          }
        })
      );
    },
    //不限制1M去掉该函数
    beforeUpload(file) {
      const isLt1M = file.size / 1024 / 1024 < 1;
      if (isLt1M) {
        return true;
      }
      this.$message({
        message: "Please do not upload files larger than 1m in size.",
        type: "warning",
      });
      return false;
    },
    handleSuccess({ results, header }) {
      this.tableData = results;
      // this.tableHeader = header;
    },
  },
};
</script>
<style lang="less" scoped></style>