vue-element-admin项目导入和导出的实现
vue-element-admin导入组件封装
模板和样式
首先封装一个类似的组件,首先需要注意的是,类似功能,vue-element-admin已经提供了,我们只需要改造即可
excel导入功能需要使用npm包xlsx,所以需要安装xlsx插件
npm i xlsx
将vue-element-admin提供的导入功能新建一个组件,位置: src/components/uploadexcel
import commontools from './commontools' import uploadexcel from './uploadexcel' export default { install(vue) { vue.component('commontools', commontools) // 注册工具栏组件 vue.component('uploadexcel', uploadexcel) // 注册导入excel组件 } }
修改样式和布局
<template> <div class="upload-excel"> <div class="btn-upload"> <el-button :loading="loading" size="mini" type="primary" @click="handleupload"> 点击上传 </el-button> </div> <input ref="excel-upload-input" class="excel-upload-input" type="file" accept=".xlsx, .xls" @change="handleclick"> <div class="drop" @drop="handledrop" @dragover="handledragover" @dragenter="handledragover"> <i class="el-icon-upload" /> <span>将文件拖到此处</span> </div> </div> </template> <script> import xlsx from 'xlsx' export default { props: { beforeupload: function, // eslint-disable-line onsuccess: function// eslint-disable-line }, data() { return { loading: false, exceldata: { header: null, results: null } } }, methods: { generatedata({ header, results }) { this.exceldata.header = header this.exceldata.results = results this.onsuccess && this.onsuccess(this.exceldata) }, handledrop(e) { e.stoppropagation() e.preventdefault() if (this.loading) return const files = e.datatransfer.files if (files.length !== 1) { this.$message.error('only support uploading one file!') return } const rawfile = files[0] // only use files[0] if (!this.isexcel(rawfile)) { this.$message.error('only supports upload .xlsx, .xls, .csv suffix files') return false } this.upload(rawfile) e.stoppropagation() e.preventdefault() }, handledragover(e) { e.stoppropagation() e.preventdefault() e.datatransfer.dropeffect = 'copy' }, handleupload() { this.$refs['excel-upload-input'].click() }, handleclick(e) { const files = e.target.files const rawfile = files[0] // only use files[0] if (!rawfile) return this.upload(rawfile) }, upload(rawfile) { this.$refs['excel-upload-input'].value = null // fix can't select the same excel if (!this.beforeupload) { this.readerdata(rawfile) return } const before = this.beforeupload(rawfile) if (before) { this.readerdata(rawfile) } }, readerdata(rawfile) { this.loading = true return new promise((resolve, reject) => { const reader = new filereader() reader.onload = e => { const data = e.target.result const workbook = xlsx.read(data, { type: 'array' }) const firstsheetname = workbook.sheetnames[0] const worksheet = workbook.sheets[firstsheetname] const header = this.getheaderrow(worksheet) const results = xlsx.utils.sheet_to_json(worksheet) this.generatedata({ header, results }) this.loading = false resolve() } reader.readasarraybuffer(rawfile) }) }, getheaderrow(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 */ const cell = sheet[xlsx.utils.encode_cell({ c: c, r: r })] /* find the cell in the first row */ let hdr = 'unknown ' + c // <-- replace with your desired default if (cell && cell.t) hdr = xlsx.utils.format_cell(cell) headers.push(hdr) } return headers }, isexcel(file) { return /\.(xlsx|xls|csv)$/.test(file.name) } } } </script> <style scoped lang="scss"> .upload-excel { display: flex; justify-content: center; margin-top: 100px; .excel-upload-input{ display: none; z-index: -9999; } .btn-upload , .drop{ border: 1px dashed #bbb; width: 350px; height: 160px; text-align: center; line-height: 160px; } .drop{ line-height: 80px; color: #bbb; i { font-size: 60px; display: block; } } } </style>
创建路由和组件
建立公共导入的页面路由,新建一个公共的导入页面,挂载路由 src/router/index.js
path: '/import', component: layout, hidden: true, // 隐藏在左侧菜单中 children: [{ path: '', // 二级路由path什么都不写 表示二级默认路由 component: () => import('@/views/import') }] },
创建import路由组件 src/views/import/index.vue
<template> <!-- 公共导入组件 --> <upload-excel :on-success="success" /> </template>
实现导入
封装导入用户的api接口
export function importuser(data) { return request({ url: 'user/batch', method: 'post', data }) }
获取导入的excel数据, 导入excel接口
async success({ header, results }) { // 如果是导入用户 const userrelations = { '入职日期': 'create_time', '手机号': 'mobile', '用户名': 'username', '密码': 'password', '邮箱': 'email', '部门':'部门' } const arr = [] results.foreach(item => { const userinfo = {} object.keys(item).foreach(key => { userinfo[userrelations[key]] = item[key] }) arr.push(userinfo) }) await importuser(arr) // 调用导入接口 this.$router.back() }
为了让这个页面可以服务更多的导入功能,我们可以在页面中用参数来判断,是否是导入用户
data() { return { type: this.$route.query.type } },
当excel中有日期格式的时候,实际转化的值为一个数字,我们需要一个方法进行转化
formatdate(numb, format) { const time = new date((numb - 1) * 24 * 3600000 + 1) time.setyear(time.getfullyear() - 70) const year = time.getfullyear() + '' const month = time.getmonth() + 1 + '' const date = time.getdate() - 1 + '' if (format && format.length === 1) { return year + format + month + format + date } return year + (month < 10 ? '0' + month : month) + (date < 10 ? '0' + date : date) }
导入的手机号不能和之前的存在的手机号重复
逻辑判断
async success({ header, results }) { if (this.type === 'user') { const userrelations = { '入职日期': 'create_time', '手机号': 'mobile', '用户名': 'username', '密码': 'password', '邮箱': 'email', '部门':'部门' } const arr = [] // 遍历所有的数组 results.foreach(item => { // 需要将每一个条数据里面的中文都换成英文 const userinfo = {} object.keys(item).foreach(key => { // key是当前的中文名 找到对应的英文名 if (userrelations[key] === 'timeofentry' || userrelations[key] === 'correctiontime') { userinfo[userrelations[key]] = new date(this.formatdate(item[key], '/')) // 只有这样, 才能入库 return } userinfo[userrelations[key]] = item[key] }) // 最终userinfo变成了全是英文 arr.push(userinfo) }) await importuser(arr) this.$message.success('导入成功') } this.$router.back() // 回到上一页 }, formatdate(numb, format) { const time = new date((numb - 1) * 24 * 3600000 + 1) time.setyear(time.getfullyear() - 70) const year = time.getfullyear() + '' const month = time.getmonth() + 1 + '' const date = time.getdate() - 1 + '' if (format && format.length === 1) { return year + format + month + format + date } return year + (month < 10 ? '0' + month : month) + (date < 10 ? '0' + date : date) }
用户页面跳转
<el-button type="warning" size="small" @click="$router.push('/import?type=user')">导入</el-button>
用户导出**
日常业务中,我们经常遇到excel导出功能, 怎么使用呢
excel 的导入导出都是依赖于js-xlsx来实现的。
在 js-xlsx的基础上又封装了export2excel.js来方便导出数据。
安装所需依赖
npm install xlsx file-saver -s npm install script-loader -s -d
由于js-xlsx体积还是很大的,导出功能也不是一个非常常用的功能,所以使用的时候建议使用懒加载。使用方法如下:
import('@/vendor/export2excel').then(excel => { excel.export_json_to_excel({ header: theader, //表头 必填 data, //具体数据 必填 filename: 'excel-list', //非必填 autowidth: true, //非必填 booktype: 'xlsx' //非必填 }) })
excel导出参数的介绍
vue-element-admin提供了导出的功能模块,在课程资源/excel导出目录下,放置到src目录下
excel导出基本的结构
下面代码会用到 export2excel.js 模块,所以首先在 src 目录下新建 vendor 目录,其中新建 export2excel.js ,输入如下代码
/* 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}`); }
因为数据中的key是英文,想要导出的表头是中文的话,需要将中文和英文做对应
const headers = { '入职日期': 'create_time', '手机号': 'mobile', '用户名': 'username', '角色': 'role_name', '邮箱': 'email', '部门': 'department_name' }
完成导出代码
import { formatdate } from '@/filters' // 导出数据 exportdata() { const headers = { '入职日期': 'create_time', '手机号': 'mobile', '用户名': 'username', '角色': 'role_name', '邮箱': 'email', '部门': 'department_name' } import('@/vendor/export2excel').then(async excel => { const res = await getuserlist({ query: '', pagenum: 1, pagesize: this.page.total }) // console.log(res) const data = this.formatjson(headers, res.users) console.log(data) excel.export_json_to_excel({ header: object.keys(headers), data, filename: '用户信息表', autowidth: true, booktype: 'xlsx' }) }) } }
导出时间格式的处理
// 该方法负责将数组转化成二维数组 formatjson(headers, rows) { return rows.map(item => { return object.keys(headers).map(key => { if (headers[key] === 'create_time') { return formatdate(item[headers[key]]) // formatdate 函数是定义好的一个过滤器 } return item[headers[key]] }) })
过滤器 formatdate
import moment from 'moment' export function formattime(value) { return moment(value * 1000).format('yyyy-mm-dd hh:mm:ss') } export function formatdate(value) { return moment(value * 1000).format('yyyy-mm-dd') }
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