How to use vue and Element-plus to implement upload and download file functions

How to use Vue and Element Plus to implement the upload and download file functions

Introduction:
In web applications, file upload and download functions are very common. This article will introduce how to use Vue and Element Plus to implement file upload and download functions. Through the sample code, you can easily and intuitively understand how to use Vue and Element Plus to implement these functions.

1. Install and import Element Plus

1. Install Element Plus
   In the root directory of the Vue project, open the terminal and execute the following command to install Element Plus:

   npm i element-plus -S

2. Import Element Plus
   In the main.js file, add the following code to import and use Element Plus globally:

   import { createApp } from 'vue';
   import ElementPlus from 'element-plus';
   import 'element-plus/lib/theme-chalk/index.css';
   
   createApp(App).use(ElementPlus).mount('#app');

2. File upload

1. Create upload component
   Create the Upload.vue component in the Vue project, the code is as follows:

   <template>
     <div>
    <el-upload
      action="/api/upload"
      :auto-upload="false"
      :on-change="handleChange"
    >
      <el-button slot="trigger">选取文件</el-button>
      <el-button type="primary" @click="handleUpload">上传到服务器</el-button>
      <p v-if="fileList.length">已选文件: {{ fileList }}</p>
    </el-upload>
     </div>
   </template>
   
   <script>
   export default {
     data() {
    return {
      fileList: [], // 存储已选文件的列表
    };
     },
     methods: {
    handleChange(file, fileList) { // 选择文件时触发的方法
      this.fileList = fileList;
    },
    handleUpload() { // 上传文件方法
      // 发送上传文件请求
      // 当上传完成后的处理操作
    },
     },
   };
   </script>
   
   <style>
   </style>

2. File upload function description
3. <el-upload>: Use the upload component provided by Element Plus.
4. action: Specify the interface address for uploading files.
5. auto-upload: Configure whether to automatically upload files according to requirements.
6. on-change: Method triggered when file selection changes.
7. <el-button slot="trigger">: Trigger the button to select the file.
8. <el-button type="primary" @click="handleUpload">: Click the button to trigger the uploading of files.
9. fileList: Used to store a list of selected files.

3. File download

1. Create download component
   Create the Download.vue component in the Vue project, the code is as follows:

   <template>
     <div>
    <el-button @click="handleDownload">下载文件</el-button>
     </div>
   </template>
   
   <script>
   export default {
     methods: {
    handleDownload() { // 下载文件方法
      // 发送下载文件请求
      // 当下载完成后的处理操作
    },
     },
   };
   </script>
   
   <style>
   </style>

2. File download function description
3. <el-button @click="handleDownload">: Click the button to trigger the download of the file.

4. Summary
Through the above code examples, we can see how to use Vue and Element Plus to implement file upload and download functions. In the upload component, we use the <el-upload> component provided by Element Plus, and monitor file selection changes and trigger the method of uploading files; in the download component, we use the <el-upload> component provided by Element Plus.

button, and listen to the method that triggers the file download. Based on specific business needs, we can further improve the file upload and download functions.

Note: The request operations of uploading and downloading files in the above example need to be implemented according to the specific situation. This is just a simple demonstration of the use of components and the processing of related functions.

###I hope the content of this article will be helpful to use Vue and Element Plus to implement file upload and download functions. ###

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