Use axios to upload files in vue

I have been learning axios recently, and then used it in the project, so this article mainly introduces you to the relevant information about using axios in vue to realize real-time update of file upload progress. The article first gives a brief introduction to axios and the method. Everyone understands learning. Friends who need it can learn together below.

axios Introduction

axios is a Promise-based HTTP client for browsers and nodejs. It has the following characteristics:

• Create XMLHttpRequest from the browser

• Issue an http request from node.js

• Support Promise API

• Interception of requests and responses

• Convert request and response data

• Cancel request

• Automatically convert JSON data

• The client supports preventing CSRF/XSRF

Introduction method:

$ npm install axios
//使用淘宝源
$ cnpm install axios
//或者使用cdn：
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>

When installing other plug-ins, you can directly introduce them in main.js and use Vue.use() to register, but axios is not a vue plug-in, so you cannot use Vue.use (), so it can only be introduced immediately in each component that needs to send a request.

In order to solve this problem, after introducing axios, we modified the prototype chain to make it more convenient to use.

//main.js

import axios from 'axios'
Vue.prototype.$http = axios

After adding these two lines of code to main.js, you can use the $http command directly in the component's methods

methods: {
postData () {
this.$http({
method: 'post',
url: '/user',
data: {
name: 'xiaoming',
info: '12'
}
})
}

For more basic knowledge, you can refer to this article: //www.jb51.net/article/110324.htm

##vue uses axios to realize real-time update of file upload progress

The progress event has been added to the XHR level 2, whereby we can add a real-time data progress bar while the browser is receiving new data, thus making the interaction more friendly

vue template

<p class="progress" @click="upload"
   :style="{backgroundImage:&#39;linear-gradient(to right,#C0C7CB 0%,#C0C7CB &#39;+progress+&#39;,#E1E6E9 &#39;+progress+&#39;,#E1E6E9 100%)&#39;}">

vue-js

 var form = new FormData()
 form.append('file', vm.$refs.upload.files[0])
 form.append('id', id)
 form.append('type', type)
 var config = {
  onUploadProgress: progressEvent => {
   var complete = (progressEvent.loaded / progressEvent.total * 100 | 0) + '%'
   this.progress = complete
  }
 }
 axios.post(`api/uploadFile`,
  form, config).then((res) => {
  if (res.data.status === 'success') {
   console.log('上传成功')
  }
 })

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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