前端如何不用接口导出Excel

最新推荐文章于 2023-07-24 23:38:47 发布

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最新推荐文章于 2023-07-24 23:38:47 发布

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本文链接：https://blog.youkuaiyun.com/qq_41662145/article/details/121424018

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前端如何不用接口导出Excel

场景：已经有多个子场景的表格数据的时候，需要导出表格，按照场景分成同的sheet页，但不用后台接口，前端如何实现

直接上

准备：

1.下载

npm install file-saver --save

2.xlsx

npm install xlsx

3.数据处理（复制一下代码到 Export2MultipleSheetExcel.js）

// 文件名：Export2MultipleSheetExcel
/* 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"
  )
}
 
//主要修改此函数内的方法
export function export_json_to_excel({
  multiHeader = [],
  header,
  data,
  sheetname,
  filename,
  merges = [],
  autoWidth = true,
  bookType = "xlsx"
} = {}) {
  /* original data */
  filename = filename || "excel-list"
  data = [...data]
 
  for (var i = 0; i < header.length; i++) {
    data[i].unshift(header[i])
  }
 
  // data.unshift(header)
 
  for (let i = multiHeader.length - 1; i > -1; i--) {
    data.unshift(multiHeader[i])
  }
 
  var ws_name = sheetname
  var wb = new Workbook(),
    ws = []
  for (var j = 0; j < header.length; j++) {
    ws.push(sheet_from_array_of_arrays(data[j]))
  }
 
  if (merges.length > 0) {
    if (!ws["!merges"]) ws["!merges"] = []
    merges.forEach(item => {
      ws["!merges"].push(XLSX.utils.decode_range(item))
    })
  }
  // console.log("width", autoWidth)
  if (autoWidth) {
    /*设置worksheet每列的最大宽度*/
    var colWidth = []
    for (var k = 0; k < header.length; k++) {
      colWidth.push(
        data[k].map(row =>
          row.map(val => {
            /*先判断是否为null/undefined*/
            if (val == null) {
              return {
                wch: 10
              }
            } else if (val.toString().charCodeAt(0) > 255) {
              /*再判断是否为中文*/
              return {
                wch: val.toString().length * 2
              }
            } else {
              return {
                wch: val.toString().length
              }
            }
          })
        )
      )
    }
 
    /*以第一行为初始值*/
    let result = []
    for (var k = 0; k < colWidth.length; k++) {
      result[k] = colWidth[k][0]
      for (let i = 1; i < colWidth[k].length; i++) {
        for (let j = 0; j < colWidth[k][i].length; j++) {
          if (result[k][j]["wch"] < colWidth[k][i][j]["wch"]) {
            result[k][j]["wch"] = colWidth[k][i][j]["wch"]
          }
        }
      }
    }
    // 分别给sheet表设置宽度
    for (var l = 0; l < result.length; l++) {
      ws[l]["!cols"] = result[l]
    }
  }
 
  /* add worksheet to workbook */
  for (var k = 0; k < header.length; k++) {
    wb.SheetNames.push(ws_name[k])
    wb.Sheets[ws_name[k]] = ws[k]
  }
 
  var wbout = XLSX.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: "binary"
  })
  saveAs(
    new Blob([s2ab(wbout)], {
      type: "application/octet-stream"
    }),
    `${filename}.${bookType}`
  )
}

4.数据接收（multipleSheetExport.js）

/**
 * multipleSheetExport
 * tableJson 导出数据
 * filenames 导出表的名字
 * autowidth 表格宽度自动
 * bookTypes Xlsx & csv & txt
 * @param {(Object)} tableJson
 * @param {string} filenames
 * @param {boolean} autowidth
 * @param {string} bookTypes
 */
export function multipleSheetExport(tableJson, filenames, autowidth, bookTypes) {
  import('./Export2MultipleSheetExcel').then(excel => {
    let tHeader = []
    let dataArr = []
    let sheetnames = []
    for (let i in tableJson) {
      tHeader.push(tableJson[i].tHeader)
      if (tableJson[i].filterVal) {
        dataArr.push(formatJson(tableJson[i].filterVal, tableJson[i].tableDatas))
      } else {
        dataArr.push(tableJson[i].tableDatas)
      }
      sheetnames.push(tableJson[i].sheetName)
    }
    excel.export_json_to_excel({
      header: tHeader,
      data: dataArr,
      sheetname: sheetnames,
      filename: filenames,
      autoWidth: autowidth,
      bookType: bookTypes,
    })
  })
}

function formatJson(filterVal, jsonData) {
  return jsonData.map(v => filterVal.map(j => v[j]))
}

应用

methods: {
	downloadExcel() {
		let tableData = [{a: 1, b:2, c:3}]
		if (this.tableData.length) {
          require.ensure([], () => {
            const { multipleSheetExport } = require('./multipleSheetExport')
            multipleSheetExport(
              [
                // 根据自己实际情况转换成如下格式，多个sheet页传多个对象
                {
                  tHeader: ['AAA', 'BBB', 'CCC'], 
                  filterVal: ['a', 'b', 'c'],
                  tableDatas: tableData,
                  sheetName: '下载测试',
                },
              ],
              '下载测试',
              true,
              'xlsx',
            )
	}
}