前言

众所周知，ElementUI,是一个比较完善的UI库，但是使用它需要有一点vue的基础。在开始本文的正文之前，我们先来看看安装的方法吧。

安装ElementUI模块

cnpm install element-ui -S

在main.js中引入

import ElementUI from 'element-ui'
import 'element-ui/lib/theme-default/index.css'

全局安装

Vue.use(ElementUI)

当我们安装完记得重新运行，cnpm run dev ，现在就可以直接使用elementUI了。

vue + element-ui导入导出功能

1.前段后台管理系统中数据展示一般都是用表格,表格会涉及到导入和导出;

2.导入是利用element-ui的Upload 上传组件;

<el-upload class="upload-demo"
 :action="importUrl"//上传的路径
 :name ="name"//上传的文件字段名
 :headers="importHeaders"//请求头格式
 :on-preview="handlePreview"//可以通过 file.response 拿到服务端返回数据
 :on-remove="handleRemove"//文件移除
 :before-upload="beforeUpload"//上传前配置
 :on-error="uploadFail"//上传错误
 :on-success="uploadSuccess"//上传成功
 :file-list="fileList"//上传的文件列表
 :with-credentials="withCredentials">//是否支持cookie信息发送
</el-upload>

3.导出是利用file的一个对象blob;通过调用后台接口拿到数据,然后用数据来实例化blob,利用a标签的href属性链接到blob对象

 export const downloadTemplate = function (scheduleType) {
 axios.get('/rest/schedule/template', {
 params: {
 "scheduleType": scheduleType
 },
 responseType: 'arraybuffer'
 }).then((response) => {
 //创建一个blob对象,file的一种
 let blob = new Blob([response.data], { type: 'application/x-xls' })
 let link = document.createElement('a')
 link.href = window.URL.createObjectURL(blob)
 //配置下载的文件名
 link.download = fileNames[scheduleType] + '_' + response.headers.datestr + '.xls'
 link.click()
 })
 }

4.贴上整个小demo的完整代码,在后台开发可以直接拿过去用(vue文件)

<template>
<p>
 <el-table
 ref="multipleTable"
 :data="tableData3"
 tooltip-effect="dark"
 border
 style="width: 80%"
 @selection-change="handleSelectionChange">
 <el-table-column
 type="selection"
 width="55">
 </el-table-column>
 <el-table-column
 label="日期"
 width="120">
 <template slot-scope="scope">{{ scope.row.date }}</template>
 </el-table-column>
 <el-table-column
 prop="name"
 label="姓名"
 width="120">
 </el-table-column>
 <el-table-column
 prop="address"
 label="地址"
 show-overflow-tooltip>
 </el-table-column>
 </el-table>
 <p style="margin-top: 20px">
 <el-button @click="toggleSelection([tableData3[1], tableData3[2]])">切换第二、第三行的选中状态</el-button>
 <el-button @click="toggleSelection()">取消选择</el-button>
 <el-button type="primary" @click="importData">导入</el-button>
 <el-button type="primary" @click="outportData">导出</el-button>
 </p>
 <!-- 导入 -->
 <el-dialog title="导入" :visible.sync="dialogImportVisible" :modal-append-to-body="false" :close-on-click-modal="false" class="dialog-import">
 <p :class="{'import-content': importFlag === 1, 'hide-dialog': importFlag !== 1}">
 <el-upload class="upload-demo"
 :action="importUrl"
 :name ="name"
 :headers="importHeaders"
 :on-preview="handlePreview"
 :on-remove="handleRemove"
 :before-upload="beforeUpload"
 :on-error="uploadFail"
 :on-success="uploadSuccess"
 :file-list="fileList"
 :with-credentials="withCredentials">
 <!-- 是否支持发送cookie信息 -->
 <el-button size="small" type="primary" :disabled="processing">{{uploadTip}}</el-button>
 <p slot="tip" class="el-uploadtip">只能上传excel文件</p>
 </el-upload>
 <p class="download-template">
 <a class="btn-download" @click="download">
 <i class="icon-download"></i>下载模板</a>
 </p>
 </p>
 <p :class="{'import-failure': importFlag === 2, 'hide-dialog': importFlag !== 2}" >
 <p class="failure-tips">
 <i class="el-icon-warning"></i>导入失败</p>
 <p class="failure-reason">
 <h4>失败原因</h4>
 <ul>
 <li v-for="(error,index) in errorResults" :key="index">第{{error.rowIdx + 1}}行，错误：{{error.column}},{{error.value}},{{error.errorInfo}}</li>
 </ul>
 </p>
 </p>
 </el-dialog>
 <!-- 导出 -->
</p>
</template>
<script>
import * as scheduleApi from '@/api/schedule'
export default {
 data() {
 return {
 tableData3: [
 {
 date: "2016-05-03",
 name: "王小虎",
 address: "上海市普陀区金沙江路 1518 弄"
 },
 {
 date: "2016-05-02",
 name: "王小虎",
 address: "上海市普陀区金沙江路 1518 弄"
 },
 {
 date: "2016-05-04",
 name: "王小虎",
 address: "上海市普陀区金沙江路 1518 弄"
 },
 {
 date: "2016-05-01",
 name: "王小虎",
 address: "上海市普陀区金沙江路 1518 弄"
 },
 {
 date: "2016-05-08",
 name: "王小虎",
 address: "上海市普陀区金沙江路 1518 弄"
 },
 {
 date: "2016-05-06",
 name: "王小虎",
 address: "上海市普陀区金沙江路 1518 弄"
 },
 {
 date: "2016-05-07",
 name: "王小虎",
 address: "上海市普陀区金沙江路 1518 弄"
 }
 ],
 multipleSelection: [],
 importUrl:'www.baidu.com',//后台接口config.admin_url+'rest/schedule/import/'
 importHeaders:{
 enctype:'multipart/form-data',
 cityCode:''
 },
 name: 'import',
 fileList: [],
 withCredentials: true,
 processing: false,
 uploadTip:'点击上传',
 importFlag:1,
 dialogImportVisible:false,
 errorResults:[]
 };
 },
 methods: {
 toggleSelection(rows) {
 if (rows) {
 rows.forEach(row => {
 this.$refs.multipleTable.toggleRowSelection(row);
 });
 } else {
 this.$refs.multipleTable.clearSelection();
 }
 },
 handleSelectionChange(val) {
 //复选框选择回填函数,val返回一整行的数据
 this.multipleSelection = val;
 },
 importData() {
 this.importFlag = 1
 this.fileList = []
 this.uploadTip = '点击上传'
 this.processing = false
 this.dialogImportVisible = true
 },
 outportData() {
 scheduleApi.downloadTemplate()
 },
 handlePreview(file) {
 //可以通过 file.response 拿到服务端返回数据
 },
 handleRemove(file, fileList) {
 //文件移除
 },
 beforeUpload(file){
 //上传前配置
 this.importHeaders.cityCode='上海'//可以配置请求头
 let excelfileExtend = ".xls,.xlsx"//设置文件格式
 let fileExtend = file.name.substring(file.name.lastIndexOf('.')).toLowerCase();
 if (excelfileExtend.indexOf(fileExtend) <= -1) {
 this.$message.error('文件格式错误')
 return false
 }
 this.uploadTip = '正在处理中...'
 this.processing = true
 },
 //上传错误
 uploadFail(err, file, fileList) {
 this.uploadTip = '点击上传'
 this.processing = false
 this.$message.error(err)
 },
 //上传成功
 uploadSuccess(response, file, fileList) {
 this.uploadTip = '点击上传'
 this.processing = false
 if (response.status === -1) {
 this.errorResults = response.data
 if (this.errorResults) {
 this.importFlag = 2
 } else {
 this.dialogImportVisible = false
 this.$message.error(response.errorMsg)
 }
 } else {
 this.importFlag = 3
 this.dialogImportVisible = false
 this.$message.info('导入成功')
 this.doSearch()
 }
 },
 //下载模板
 download() {
 //调用后台模板方法,和导出类似
 scheduleApi.downloadTemplate()
 },
 }
};
</script>
<style scoped>
.hide-dialog{
 display:none;
}
</style>

5.js文件,调用接口

import axios from 'axios'
// 下载模板
 export const downloadTemplate = function (scheduleType) {
 axios.get('/rest/schedule/template', {
 params: {
 "scheduleType": scheduleType
 },
 responseType: 'arraybuffer'
 }).then((response) => {
 //创建一个blob对象,file的一种
 let blob = new Blob([response.data], { type: 'application/x-xls' })
 let link = document.createElement('a')
 link.href = window.URL.createObjectURL(blob)
 link.download = fileNames[scheduleType] + '_' + response.headers.datestr + '.xls'
 link.click()
 })
 }

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