VUE+Element-ui实现excel的导出功能

2022-07-22 13:17:54

1、安装第三方工具包

npm install file-saver script-loader xlsx --save

2、使用vue-element-admin中的src/vendor/export2Excel

具体代码：

/* 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}`);
}

3、在组件中使用export2Excel，回调函数内容如下

// 导出excel
 hExportExcel() {
    import('@/vendor/Export2Excel').then(excel => {
   // excel表示导入的模块对象
   console.log(excel)
  excel.export_json_to_excel({
   header: ['姓名', '工资'], // 表头 必填
  data: [
  ['刘备', 100],
  ['关羽', 500]
  ], // 具体数据 必填
  filename: 'excel-list', // 文件名称
  autoWidth: true, // 宽度是否自适应
  bookType: 'xlsx' // 生成的文件类型
  })
 })
}

4、以上代码表示:

  1. 当我们正式点击导出按钮之后，才去加载vendor文件夹中的Export2Excel模块

  2. import方法执行完毕返回的是一个promise对象，在then方法中我们可以拿到使用的模块对象

  3. 重点关注data的配置部分，我们发现它需要一个严格的二维数组

  4. Excel导出参数说明

    参数

    说明

    类型

    可选值

    默认值

    header

    导出数据的表头

    Array

    /

    []

    data

    导出的具体数据

    Array

    /

    [[]]

    filename

    导出文件名

    String

    /

    excel-list

    autoWidth

    单元格是否要自适应宽度

    Boolean

    true / false

    true

    bookType

    导出文件类型

    String

    xlsx, csv, txt,more

    xlsx

5、结合案例，使用业务真实数据实现excel的导出功能

思路

  1. 从后台重新获取数据（这样才能确保是最新的）

    1. 对数据的格式进行转换（后端给的数据字段名都是英文的），以用来做导出

 transformDat(res) {
      const mapInfo = {
        id: '编号',
        password: '密码',
        mobile: '手机号',
        username: '姓名',
        timeOfEntry: '入职日期',
        formOfEmployment: '聘用形式',
        correctionTime: '转正日期',
        workNumber: '工号',
        departmentName: '部门',
        staffPhoto: '头像地址'
      }
      // res:[{id:'xxxx',departmentName:'总裁办',mobile:'1382222222'},{}]
      // 对data进行格式化
      // 取出所有的属性名
      const props = Object.keys(res[0]) // ['id','']
      console.log(props)
      // 将属性名从英文转为中文
      const header = props.map(zhkey => mapInfo[zhkey])
      console.log('中文的名字', header)
      // const data=[['xxxx','总裁办'，'13800000']]
      const data = res.map(obj => Object.values(obj))
      console.log(data)

      return { header, data }
    },
    // 导出excel
    async hExportExcel() {
      // 1、ajax获取数据
      // async+await修饰。保证先点按钮在发请求拿数据，
      // 在发请求是要保证拿到的是最新的数据
      await this.loadEmployees()
      // console.log(this.list)
      // 2、数据格式转换
      const { header, data } = this.transformDat(this.list)
      // console.log(header, data)

      import('@/vendor/Export2Excel').then(excel => {
        excel.export_json_to_excel({
          // 标题
          header,
          // 数据
          data,
          // 文件名称
          filename: '员工数据',
          // 宽度自适应
          autoWidth: this.autoWidth,

          bookType: this.bookType
        })
        
      })
    }
  • 作者：丹丹呀～～
  • 原文链接：https://blog.csdn.net/weixin_55690518/article/details/119863817
    更新时间：2022-07-22 13:17:54