To implement file upload with progress bars in Vue, use Axios to track progress and bind to UI components. 1. Create file input and buttons, and use selectedFile and progress variables to manage files and progress; 2. Use Axios' onUploadProgress method to calculate upload progress and update progress value; 3. Ensure the backend supports multipart/form-data format and CORS configuration; 4. You can customize progress bar styles through CSS or UI library; 5. Add disable buttons, error prompts, file size restrictions, etc. to improve user experience; 6. After the infrastructure is completed, you can expand functions such as drag and drop upload, multi-file upload, etc.
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-datauploads. - 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;
}Basically that's it. 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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