How to use Vue and Element-UI to export and import table data

How to use Vue and Element-UI to export and import table data

Exporting and importing table data is one of the common needs in web application development. Vue and Element-UI provide a convenient way to implement this function. This article will introduce how to use Vue and Element-UI to export and import tabular data, with code examples.

1. Export table data
   In Vue, to use the Element-UI table component (Table) to display and edit data, you first need to install Element-UI and introduce the required components.

Install Element-UI:

npm install element-ui --save

Introduce the required Element-UI components into the Vue component:

import { Table, TableColumn, Button } from 'element-ui';

Define the table in the template of the Vue component:

<template>
  <div>
    <el-button type="primary" @click="exportData">导出数据</el-button>
    <el-table :data="tableData">
      <el-table-column prop="name" label="姓名"></el-table-column>
      <el-table-column prop="age" label="年龄"></el-table-column>
      <!-- 更多列... -->
    </el-table>
  </div>
</template>

Define table data and export functions in the script of the Vue component:

export default {
  data() {
    return {
      tableData: [
        { name: '张三', age: 18 },
        { name: '李四', age: 20 },
        // 更多数据...
      ]
    }
  },
  methods: {
    exportData() {
      // 导出数据逻辑
      const jsonData = JSON.stringify(this.tableData);
      const blob = new Blob([jsonData], { type: 'application/json' });
      const url = URL.createObjectURL(blob);
      const link = document.createElement('a');
      link.href = url;
      link.download = 'data.json';
      link.click();
    }
  }
}

In the above code, we use a button element (Button) to trigger the method of exporting data (exportData) . In the exportData method, we convert the table data (this.tableData) into JSON format data and create a Blob (binary large object) object. Then, the Blob object is converted into a temporary URL through the URL.createObjectURL method, and the href and download attributes are set by creating an a tag (link), and finally the click method is called to trigger the download.

2. Import table data
   Importing table data is also a common requirement. In Vue, we can implement the import function by using the upload component (Upload) of Element-UI.

Add the upload component in the template of the Vue component:

<template>
  <div>
    <el-upload
      action="/upload"
      :on-success="handleSuccess"
      multiple
      :before-upload="beforeUpload"
    >
      <el-button slot="trigger">选择文件</el-button>
    </el-upload>
    <!-- 表格代码... -->
  </div>
</template>

Define the import function in the script of the Vue component:

export default {
  methods: {
    handleSuccess(res) {
      // 导入成功逻辑
      const uploadedData = JSON.parse(res.response);
      // 处理导入的数据...
    },
    beforeUpload(file) {
      // 导入前的逻辑
      const reader = new FileReader();
      reader.onload = (e) => {
        const importedData = JSON.parse(e.target.result);
        // 处理导入的数据...
      };
      reader.readAsText(file.raw);
      return false; // 阻止上传组件默认行为
    }
  }
}

In the above code, we first An upload component (Upload) is added to the template, which receives an action attribute to set the URL interface for file upload, triggers the callback method (handleSuccess) for successful import through on-success, and sets the pre-import through before-upload. Callback method (beforeUpload).

In the handleSuccess method, we get the imported data from the response returned by the server and convert it into JSON format. You can customize specific processing logic in this method, such as updating the data of the Vue component, etc.

In the beforeUpload method, we use the FileReader object to read the file content and convert it into JSON format after the reading is completed. You can also customize specific processing logic in this method.

This article introduces how to use Vue and Element-UI to export and import table data, and provides relevant code examples. I hope this article can help you use Vue and Element-UI to implement data export and import functions in actual development.

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