How to realize the progress display of file upload and download through vue and Element-plus

How to realize the progress display of file upload and download through Vue and Element-plus

In web applications, it is a very common requirement to realize file upload and download. The progress display of file upload and download can help users understand the progress of the operation and improve user experience. This article will introduce how to display the progress of file upload and download through Vue and Element-plus, and provide relevant code examples.

Element-plus is a Vue component library that provides rich UI components and commonly used functions. We will use the Upload and Progress components in Element-plus to display the progress of file upload and download.

First, we need to install and introduce Element-plus. In the root directory of the project, execute the following command to install:

npm install element-plus --save

Introduce Element-plus into Vue’s entry file main.js:

import { createApp } from 'vue'
import ElementPlus from 'element-plus'
import 'element-plus/lib/theme-chalk/index.css'

createApp(App).use(ElementPlus).mount('#app')

Next, we need to create a file with Vue component for uploading and downloading functions. In the template of this component, use the Upload component to implement the file upload function, and use the Progress component to display the progress of uploading and downloading.

<template>
  <div>
    <div>
      <el-upload
        class="upload-demo"
        action="/api/upload"
        :on-progress="handleUploadProgress"
        :on-success="handleUploadSuccess"
        :before-remove="beforeRemove"
      >
        <el-button size="small" type="primary">点击上传</el-button>
      </el-upload>
      <el-progress :percentage="uploadProgress" />
    </div>
    <div>
      <el-button size="small" type="primary" @click="handleDownload">下载文件</el-button>
      <el-progress :percentage="downloadProgress" />
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      uploadProgress: 0,
      downloadProgress: 0
    }
  },
  methods: {
    handleUploadProgress(event, file, fileList) {
      this.uploadProgress = event.percent
    },
    handleUploadSuccess(response, file, fileList) {
      // 上传成功后的处理逻辑
    },
    handleDownload() {
      // 下载文件的逻辑
    },
    downloadProgress() {
      // 更新下载进度
    }
  }
}
</script>

In the above code, we use the on-progress event of the Upload component to update the upload progress, and use the Progress component to display the progress of upload and download. The handleUploadProgress method will be triggered during the file upload process. The parameter event contains upload progress information, and we assign it to uploadProgress. The handleUploadSuccess method will be triggered after the file is successfully uploaded, and the logic after the upload is successful can be processed here.

For file downloads, we can use the download function that comes with the browser, and then use setInterval to regularly obtain the download progress and update downloadProgress.

handleDownload() {
  const downloadUrl = '/api/download'
  window.open(downloadUrl, '_blank')
  setInterval(this.updateDownloadProgress, 1000)
},
updateDownloadProgress() {
  // 获取下载进度，更新downloadProgress
}

In the above code, we open the download link through window.open, and then use setInterval to regularly call the updateDownloadProgress method to obtain the download progress. It is assumed here that we have an interface /api/download to return the progress information of file download.

Through the above code implementation, we can realize the progress display of file upload and download in the Vue application. Using the Upload and Progress components provided by Element-plus, combined with Vue's event and status management, you can easily implement this function and improve the user experience.

Summary: This article introduces how to display the progress of file upload and download through Vue and Element-plus. This function can be easily achieved by using the Upload and Progress components, combined with event and status management. Hope this article can help you.

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