js导出excel

Posted 2022-11-05 Jay_帅小伙

/* 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`);