crmeb_shop/template/admin/src/libs/excel.js

// +---------------------------------------------------------------------
// | CRMEB [ CRMEB赋能开发者，助力企业发展 ]
// +---------------------------------------------------------------------
// | Copyright (c) 2016~2023 https://www.crmeb.com All rights reserved.
// +---------------------------------------------------------------------
// | Licensed CRMEB并不是自由软件，未经许可不能去掉CRMEB相关版权
// +---------------------------------------------------------------------
// | Author: CRMEB Team <admin@crmeb.com>
// +---------------------------------------------------------------------

/* eslint-disable */
import XLSX from 'xlsx';

function auto_width(ws, data) {
  /*set worksheet max width per col*/
  const colWidth = data.map((row) =>
    row.map((val) => {
      /*if null/undefined*/
      if (val == null) {
        return { wch: 10 };
      } else if (val.toString().charCodeAt(0) > 255) {
        /*if chinese*/
        return { wch: val.toString().length * 2 };
      } else {
        return { wch: val.toString().length };
      }
    }),
  );
  /*start in the first row*/
  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;
}

function json_to_array(key, jsonData) {
  return jsonData.map((v) =>
    key.map((j) => {
      return v[j];
    }),
  );
}

// fix data,return string
function fixdata(data) {
  let o = '';
  let l = 0;
  const w = 10240;
  for (; l < data.byteLength / w; ++l)
    o += String.fromCharCode.apply(null, new Uint8Array(data.slice(l * w, l * w + w)));
  o += String.fromCharCode.apply(null, new Uint8Array(data.slice(l * w)));
  return o;
}

// get head from excel file,return array
function get_header_row(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 */
    var cell = sheet[XLSX.utils.encode_cell({ c: C, r: R })]; /* find the cell in the first row */
    var hdr = 'UNKNOWN ' + C; // <-- replace with your desired default
    if (cell && cell.t) hdr = XLSX.utils.format_cell(cell);
    headers.push(hdr);
  }
  return headers;
}

export const export_table_to_excel = (id, filename) => {
  const table = document.getElementById(id);
  const wb = XLSX.utils.table_to_book(table);
  XLSX.writeFile(wb, filename);

  /* the second way */
  // const table = document.getElementById(id);
  // const wb = XLSX.utils.book_new();
  // const ws = XLSX.utils.table_to_sheet(table);
  // XLSX.utils.book_append_sheet(wb, ws, filename);
  // XLSX.writeFile(wb, filename);
};

export const export_json_to_excel = ({ data, key, title, filename, autoWidth }) => {
  const wb = XLSX.utils.book_new();
  data.unshift(title);
  const ws = XLSX.utils.json_to_sheet(data, { header: key, skipHeader: true });
  if (autoWidth) {
    const arr = json_to_array(key, data);
    auto_width(ws, arr);
  }
  XLSX.utils.book_append_sheet(wb, ws, filename);
  XLSX.writeFile(wb, filename + '.xlsx');
};

export const export_array_to_excel = ({ key, data, title, filename, autoWidth }) => {
  const wb = XLSX.utils.book_new();
  const arr = json_to_array(key, data);
  arr.unshift(title);
  const ws = XLSX.utils.aoa_to_sheet(arr);
  if (autoWidth) {
    auto_width(ws, arr);
  }
  XLSX.utils.book_append_sheet(wb, ws, filename);
  XLSX.writeFile(wb, filename + '.xlsx');
};

export const read = (data, type) => {
  /* if type == 'base64' must fix data first */
  // const fixedData = fixdata(data)
  // const workbook = XLSX.read(btoa(fixedData), { type: 'base64' })
  const workbook = XLSX.read(data, { type: type });
  const firstSheetName = workbook.SheetNames[0];
  const worksheet = workbook.Sheets[firstSheetName];
  const header = get_header_row(worksheet);
  const results = XLSX.utils.sheet_to_json(worksheet);
  return { header, results };
};

export default {
  export_table_to_excel,
  export_array_to_excel,
  export_json_to_excel,
  read,
};