在Vue中實現(xiàn)帶進度條的文件上傳需使用Axios跟蹤進度並綁定到UI組件。 1. 創(chuàng)建文件輸入和按鈕，並用selectedFile與progress變量管理文件與進度；2. 使用Axios的onUploadProgress方法計算上傳進度並更新progress值；3. 確保後端支持multipart/form-data格式及CORS配置；4. 可通過CSS或UI庫自定義進度條樣式；5. 添加禁用按鈕、錯誤提示、文件大小限制等提升用戶體驗；6. 基礎結(jié)構(gòu)完成後可擴展拖拽上傳、多文件上傳等功能。

Uploading a file with a progress bar in Vue is a common feature in modern web apps, especially when dealing with large files. The key is to track the upload progress using Axios (or another HTTP client) and bind that data to a UI component like a progress bar.

Here's how to do it in a straightforward way.

Setting up the File Input and Data

Start by creating a basic file input in your Vue template. You'll also need a variable to store the selected file and another to track the upload progress.

 <template>
  <div>
    <input type="file" @change="handleFileUpload" />
    <button @click="submitFile">Upload</button>
    <progress :value="progress" max="100"></progress>
    <span>{{ progress }}%</span>
  </div>
</template>

In your script section, set up the reactive data:

 export default {
  data() {
    return {
      selectedFile: null,
      progress: 0
    };
  },
  methods: {
    handleFileUpload(event) {
      this.selectedFile = event.target.files[0];
    },
    async submitFile() {
      // Upload logic goes here
    }
  }
};

Using Axios to Track Upload Progress

Axios supports tracking upload progress through its onUploadProgress config option. This function receives a progress event that includes the total and loaded bytes.

Here's how to use it inside the submitFile method:

 async submitFile() {
  const formData = new FormData();
  formData.append('file', this.selectedFile);

  try {
    const response = await axios.post('/upload-endpoint', formData, {
      onUploadProgress: (progressEvent) => {
        this.progress = Math.round(
          (progressEvent.loaded * 100) / progressEvent.total
        );
      }
    });
    console.log('Upload complete:', response.data);
  } catch (error) {
    console.error('Upload failed:', error);
  }
}

A few things to note:

• Make sure your backend accepts multipart/form-data uploads.
• CORS and server-side handling must be set up properly.
• If you're using authentication, don't forget to include the token in the request headers.

Styling and Improving the Progress Bar

The default HTML <progress> element works, but you might want to customize its look. Here's a quick example of how to style it with CSS:

 progress {
  width: 100%;
  height: 20px;
  border-radius: 10px;
  background-color: #eee;
}

progress::-webkit-progress-bar {
  background-color: #eee;
  border-radius: 10px;
}

progress::-webkit-progress-value {
  background-color: #4caf50;
  border-radius: 10px;
}

You can also replace it with a custom progress bar component if you're using a UI library like Vuetify or Element Plus.

Handling Edge Cases and UX Improvements

Here are a few small but important things to consider:

• Disable the upload button once the upload starts to prevent multiple clicks.
• Reset the progress bar after upload completes or fails.
• Show a success or error message after the upload.
• Allow users to cancel the upload if needed (requires using an AbortController ).

You can also add a file size limit check before upload starts:

 if (this.selectedFile.size > 5 * 1024 * 1024) {
  alert('File size exceeds 5MB');
  return;
}

基本上就這些。 Once the basic structure is in place, it's easy to expand with features like drag-and-drop, multiple file uploads, or preview thumbnails.

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