vue+element-ui的簡潔導入導出功能【包含上傳到雲】

前言

後臺管理系統中數據展現通常都是用表格,表格會涉及到導入和導出;

1.導入

1.1 el-upload組件

1.導入是利用element-ui的Upload 上傳組件;

<el-upload class="upload-demo"
        :action="importUrl"//上傳的路徑
        :name ="name"//上傳的文件字段名
        :headers="importHeaders"//請求頭格式
        :on-preview="handlePreview"//能夠經過 file.response 拿到服務端返回數據
        :on-remove="handleRemove"//文件移除
        :before-upload="beforeUpload"//上傳前配置
        :on-error="uploadFail"//上傳錯誤
        :on-success="uploadSuccess"//上傳成功
        :file-list="fileList"//上傳的文件列表
        :with-credentials="withCredentials">//是否支持cookie信息發送
</el-upload>

1.2 原理：

裏面對input進行了封裝，並暴露一些方法和屬性

1.3.ajax或者form上傳？

能夠設置http-request屬性，覆蓋默認的上傳行爲，能夠自定義上傳的實現

1.4 雲端COS上傳

這個通常仍是很常見的，
原理是將文件存儲到雲端，返回一個存貯地址存在本地服務器，
cos存儲過程：鑑權===分片上傳===成功返回存儲地址
tencent的cos存貯

2 導出

2.1 原理

導出是利用file的一個對象blob;
經過調用後臺接口拿到數據,
而後用數據來實例化blob,
利用a標籤的href屬性連接到blob對象

2.2 代碼示例

//聲明導出文件名對象 
    const fileNames={
    1:'模板一',
    2:'模板二',
    3:'模板三',
    4:'模板四',
    }
     export const downloadTemplate = function (scheduleType) {
            axios.get('/demo/template', {
                params: {
                    "demoType": demoType
                },
                responseType: 'arraybuffer'
            }).then((response) => {
                //建立一個blob對象,file的一種
                let blob = new Blob([response.data], { type: 'application/x-xls' })
                let link = document.createElement('a')
                link.href = window.URL.createObjectURL(blob)
                //配置下載的文件名
                link.download = fileNames[scheduleType] + '_' + response.headers.datestr + '.xls'
                link.click()
            })
        }

3.完整代碼

貼上整個小demo的完整代碼,在後臺開發能夠直接拿過去用(vue文件)

<template>
<div>

  <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>

  <div style="margin-top: 20px">
    <el-button @click="toggleSelection([tableData3[1], tableData3[2]])">切換第2、第三行的選中狀態</el-button>
    <el-button @click="toggleSelection()">取消選擇</el-button>
    <el-button type="primary" @click="importData">導入</el-button>
    <el-button type="primary" @click="outportData">導出</el-button>
  </div>

  <!-- 導入 -->
  <el-dialog title="導入" :visible.sync="dialogImportVisible" :modal-append-to-body="false" :close-on-click-modal="false" class="dialog-import">
      <div :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">
        <!-- 是否支持發送cookie信息 -->
          <el-button size="small" type="primary" :disabled="processing">{{uploadTip}}</el-button>
          <div slot="tip" class="el-upload__tip">只能上傳excel文件</div>
        </el-upload>
        <div class="download-template">
          <a class="btn-download" @click="download">
            <i class="icon-download"></i>下載模板</a>
        </div>
      </div>
      <div :class="{'import-failure': importFlag === 2, 'hide-dialog': importFlag !== 2}" >
        <div class="failure-tips">
          <i class="el-icon-warning"></i>導入失敗</div>
        <div class="failure-reason">
          <h4>失敗緣由</h4>
          <ul>
            <li v-for="(error,index) in errorResults" :key="index">第{{error.rowIdx + 1}}行，錯誤：{{error.column}},{{error.value}},{{error.errorInfo}}</li>
          </ul>
        </div>
      </div>
    </el-dialog>

  <!-- 導出 -->
</div>
</template>

<script>
import * as scheduleApi from '@/api/schedule'
export default {
  data() {
    return {
      tableData3: [
        {
          date: "2016-05-03",
          name: "王小虎",
          address: "上海市普陀區金沙江路 1518 弄"
        },
        {
          date: "2016-05-02",
          name: "王小虎",
          address: "上海市普陀區金沙江路 1518 弄"
        }
      ],
      multipleSelection: [],
      importUrl:'www.baidu.com',//後臺接口config.admin_url+'rest/schedule/import/'
      importHeaders:{
        enctype:'multipart/form-data',
        cityCode:''
      },
      name: 'import',
      fileList: [],
      withCredentials: true,
      processing: false,
      uploadTip:'點擊上傳',
      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) {
      //複選框選擇回填函數,val返回一整行的數據
      this.multipleSelection = val;
    },
    importData() {
      this.importFlag = 1
      this.fileList = []
      this.uploadTip = '點擊上傳'
      this.processing = false
      this.dialogImportVisible = true
    },
    outportData() {
      scheduleApi.downloadTemplate()
    },
    handlePreview(file) {
      //能夠經過 file.response 拿到服務端返回數據
    },
    handleRemove(file, fileList) {
      //文件移除
    },
    beforeUpload(file){
      //上傳前配置
      this.importHeaders.cityCode='上海'//能夠配置請求頭
      let excelfileExtend = ".xls,.xlsx"//設置文件格式
      let fileExtend = file.name.substring(file.name.lastIndexOf('.')).toLowerCase();
      if (excelfileExtend.indexOf(fileExtend) <= -1) {
         this.$message.error('文件格式錯誤')
         return false
      }
      this.uploadTip = '正在處理中...'
      this.processing = true
    },
    //上傳錯誤
    uploadFail(err, file, fileList) {
      this.uploadTip = '點擊上傳'
      this.processing = false
      this.$message.error(err)
    },
    //上傳成功
    uploadSuccess(response, file, fileList) {
      this.uploadTip = '點擊上傳'
      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('導入成功')
        this.doSearch()
      }
    },
    //下載模板
    download() {
      //調用後臺模板方法,和導出相似
      scheduleApi.downloadTemplate()
    },
  }
};
</script>

<style scoped>
.hide-dialog{
  display:none;
}
</style>

js文件,調用接口

    import axios from 'axios'
    
    // 下載模板
    
        export const downloadTemplate = function (scheduleType) {
            axios.get('/rest/schedule/template', {
                params: {
                    "scheduleType": scheduleType
                },
                responseType: 'arraybuffer'
            }).then((response) => {
                //建立一個blob對象,file的一種
                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()
            })
        }

結語

感謝看到這裏,很實用的導入導出功能代碼,歡迎交流!
聖誕節快到了,祝你們Merry Christmas!