前端笔记01-vue element-ui选中数据导出excel

Vue element-ui table导出Excel

最近写的一个vue项目需要导出element-ui中el-table的选中数据，网上有很多教程，不过和我的项目情况有所不同，按一般的步骤，出现了一些错误,，这里记录一下通过vue ui创建项目，导出excel的方法

1.依赖安装

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

2.在src文件下新建excel

新建Bolb.js和Export2Excel.js，这两个文件可以在网上找，不过有些版本和项目之间不适配，会出现问题。

Bolb.js

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

/* eslint-disable */
require('script-loader!file-saver');
require('./Blob'); //注意这里的路径，要和同文件夹下的Blob对应
require('script-loader!xlsx/dist/xlsx.core.min');
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);
  console.log('a')
  var oo = generateArray(theTable);
  var ranges = oo[1];

  /* original data */
  var data = oo[0];
  var ws_name = "SheetJS";
  console.log(data);

  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")
}

function formatJson(jsonData) {
  console.log(jsonData)
}
export function export_json_to_excel(th, jsonData, defaultTitle) {

  /* original data */

  var data = jsonData;
  data.unshift(th);
  var ws_name = "SheetJS";

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


  /* 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'});
  var title = defaultTitle || '列表'
  saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), title + ".xlsx")
}

3.项目中代码

下载相关的JS代码

// 列表选中数据下载
    downloadExcel() {
      this.$confirm('确定下载列表文件?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
      })
        .then(() => {
          this.excelData = this.multipleSelection // multipleSelection是一个数组，存储表格中选择的行的数据。
          this.export2Excel()
        })
        .catch(() => {})
    },
    // 数据写入excel
    export2Excel() {
      var that = this
      require.ensure([], () => {
        const { export_json_to_excel } = require('@/excel/export2Excel') // 这里必须使用绝对路径，使用@/+存放export2Excel的路径
        const tHeader = [
          'ID',
          '昵称',
          '手机号',
          '性别',
          '注册时间',
          '最后登录时间',
          '用户等级',
          '所在城市',
          '状态',
        ] // 导出的表头名信息
        const filterVal = [
          'id',
          'nickName',
          'account',
          'sex',
          'createTime',
          'lastLoginTime',
          'rank',
          'city',
          'status',
        ] // 导出的表头字段名，需要导出表格字段名
        const list = that.excelDataFormat(that.excelData)
        const data = that.formatJson(filterVal, list)
        export_json_to_excel(tHeader, data, that.getExcelName()) // 导出的表格名称，根据需要自己命名
      })
    },
    // 格式转换，直接复制即可
    formatJson(filterVal, jsonData) {
      return jsonData.map((v) => filterVal.map((j) => v[j]))
    },
    // 导出excel数据预处理
    excelDataFormat() {
      let list = this.excelData
      for (var i = 0; i < list.length; i++) {
        list[i].createTime = this.timeChange(list[i].createTime)
        list[i].lastLoginTime = this.timeChange(list[i].lastLoginTime)
      }
      return list
    },
    // excel文档名生成 取时间
    getExcelName() {
      let dt = new Date()
      return dt.toLocaleString()
    },
    // 时间格式转化
    timeChange(originVal) {
      const dt = new Date(originVal)
      const y = dt.getFullYear()
      const m = (dt.getMonth() + 1 + '').padStart(2, '0')
      const d = (dt.getDate() + '').padStart(2, '0')

      const hh = (dt.getHours() + '').padStart(2, '0')
      const mm = (dt.getMinutes() + '').padStart(2, '0')
      const ss = (dt.getSeconds() + '').padStart(2, '0')
      return `${y}-${m}-${d} ${hh}:${mm}:${ss}`
    },

element-ui el-table 选中数据

<el-table :data="userList" border stripe @selection-change="changeFun">

	// 表格选中
    changeFun(val) {
      this.multipleSelection = val
    },

4.注意点

文件中的几个文件的互相导入路径一定要写对

按照本文的步骤存放文件后，还要在项目下新建vue.config.js文件(本项目是脚手架创建的)，配置路径别名

vue.config.js

const path = require('path')
function resolve(dir) {
    return path.join(__dirname, dir)
}
module.exports = {
    lintOnSave: true,
    chainWebpack: config => {
        config.resolve.alias
            .set('@', resolve('src'))
            .set('assets', resolve('src/assets'))
            .set('components', resolve('src/components'))
            .set('layout', resolve('src/layout'))
            .set('excel', '../src/excel')
    }
}