后台系统使用导出Excel组件

后台系统使用导出Excel组件

最后修改时间:3 months ago

# 描述

最近在做后台项目中遇到要导出Excel的功能,这个功能当时特别紧急,几乎就是做完老板要用,所以慌的嘞,做完就赶紧复盘记录。

# 实战例子

1.首先需要在项目的src目录中的components文件夹下创建导出的子组件ExportExcel.vue

<template>
  <div>
    <el-button :loading="downloadLoading" type="primary" @click="handleDownload"
      >导出</el-button
    >
  </div>
</template>

<script>
export default {
  name: "ExportExcel",
  props: {
    list: {
      required: true,
      type: Array,
    },
    tHeader: {
      required: true,
      type: Array,
    },
    tValue: {
      required: true,
      type: Array,
    },
    filename: {
      type: String,
      default: "导出数据",
    },
  },
  data() {
    return {
      downloadLoading: false,
      autoWidth: true,
      bookType: "xlsx",
    };
  },
  methods: {
    handleDownload() {
      this.downloadLoading = true;
      import("@/vendor/Export2Excel").then((excel) => {
        const data = this.formatJson(this.tValue, this.list);
        excel.export_json_to_excel({
          header: this.tHeader,
          data,
          filename: this.filename,
          autoWidth: this.autoWidth,
          bookType: this.bookType,
        });
        this.downloadLoading = false;
      });
    },
    formatJson(filterVal, jsonData) {
      return jsonData.map((v) =>
        filterVal.map((j) => {
          return v[j];
        })
      );
    },
  },
};
</script>

<style scoped>
.el-button {
  width: 70px;
  height: 40px;
  padding: 0;
  margin: 0;
  text-align: center;
  background-color: #ffffff;
  color: #606266;
  border: 1px solid #dcdfe6;
}
.el-button:hover {
  background-color: #ecf5ff;
  color: #409eff;
}
</style>

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它需要引用@/vendor/Export2Excel

2.在src目录下创建vendor目录并创建Export2Excel.js

/* 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}`);
}

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3.在需要导出成Excel的页面中导入组件

import ExportExcel from "../../components/ExportExcel"
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components: { ExportExcel },
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在methods中还要定义两个方法分别关于调用下载函数和定义表格格式

    //导出下载表格
    handleDownload() {
      this.downloadLoading = true
      import("@/vendor/Export2Excel").then((excel) => {
        const data = this.formatJson(filterVal)
        excel.export_json_to_excel({
          header: tHeader,
          data,
          filename: "table-list",
        })
        this.downloadLoading = false
      })
    },
    //定义导出表格的格式
    formatJson(filterVal) {
      return this.tableData.map((v) =>
        filterVal.map((j) => {
          if (j === "timestamp") {
            return parseTime(v[j])
          } else {
            return v[j]
          }
        })
      )
    },
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最后在模板语法中使用

<export-excel

    v-if="exportList !== null"

    :list="exportList"

    :tHeader="tHeader"

    :tValue="tValue"

    filename="消毒灯后台管理系统_导出数据"

   \></export-excel>
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:tHeader 是一个数组,它绑定的是自定义Excel的表头

在data中定义

tHeader:["序号","姓名","年龄"]
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:tValue 是一个数组,它中绑定的是Excel每一列的值

tValue:["id","name","age"]
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注意:tHeader和tValue数组中的值必须一一对应

v-if 中判断的是要导出的数据源是否存在

:list 中绑定的是要导出的数据源,注意数据源最好是用对象数组的形式且对象中的数据只有一层

例如:

exportList = [
  {
      id:1,
      name:"张三",
      age:"18"
  },
  {
      id:2,
      name:"李四",
      age:"21"
  },
  ……
]
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而不能

exportList2 = [
  {
      id:1,
      name:"张三",
      age:"18",
      school:{
         schoolName:"XXX学校",
         ……
      }
  },
  {
      id:2,
      name:"李四",
      age:"21",
      school:{
         schoolName:"XXX学校",
         ……
      }
  },
  ……
]
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如果你如上定义exportList2那么你想要取schoolName就必须school.schoolName,这样是不能作为表格的值来显示的

filename 中给的值是导出表格的名字

以上就是用vue开发后台系统项目中如何创建导出功能的内容。

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