我们的系统后端使用了aws 的 serverless架构，由于lambda的限制，在上传文件时要先将文件转换为base64，才能进行上传，并且不能超过10M，。
经过一番选择，我们决定使用el-upload这个控件。
https://github.com/ElemeFE/element/issues/3087
但是，这个组件目前并没有对base64提供良好的支持。
https://github.com/ElemeFE/element/blob/2a1a6360ca763139b666aaca899703931a4a672b/packages/upload/src/upload.vue
这个是组件源码。
我目前的方法是 通过自定义 http-method，并在方法中主动触发回调事件来实现。
<template>
<el-upload class="basic-upload-field__uploader" drag ref="upload" :action="actionUrl" :on-success="uploadSuccess"
:before-upload="beforeUpload" :on-remove="removeHandler" :http-request="httpRequest" multiple>
<i class="el-icon-upload"></i>
<div class="el-upload__text">{{$t('upload.drag')}}
<em>{{$t('upload.select')}}</em>
</div>
<div class="el-upload__tip" slot="tip">{{$t('upload.tip')}}</div>
</el-upload>
</template>
<script>
import axios from '~/plugins/axios.js'
export default {
name: 'basic-upload-field',
data () {
return {
fileList: [],
actionUrl: `${process.env.baseURL}/api/file/upload`,
fileReader: '',
}
},
methods: {
httpRequest (options) {
let file = options.file
let filename = file.name
if (file) {
this.fileReader.readAsDataURL(file)
}
this.fileReader.onload = () => {
let base64Str = this.fileReader.result
let config = {
url: '/api/file/upload/base64',
method: 'post',
// file: file,
data: {
base64Str: base64Str.split(',')[1],
name: filename
},
timeout: 10000,
onUploadProgress: function (progressEvent) {
// console.log(progressEvent)
progressEvent.percent = progressEvent.loaded / progressEvent.total * 100
options.onProgress(progressEvent, file)
},
}
axios(config)
.then(res => {
options.onSuccess(res, file)
})
.catch(err => {
options.onError(err)
})
}
},
removeHandler (file, fileList) {
let index = this.fileList.indexOf(file.key)
this.fileList.splice(index, 1)
console.log('current file list ==>', this.fileList)
this.$store.commit('applicant/updateResume', this.fileList)
axios.delete(`/api/file/delete?key=${file.key}`).then(res => {
console.log(res)
})
},
beforeUpload (file) {
const isLt5M = file.size < 5 * 1024 * 1024
if (this.fileList.length >= 3) {
alert('At most 3 files')
return false
}
if (!isLt5M) {
alert('The max size is 5MB')
return false
}
},
uploadSuccess (res, file, fileList) {
let data = res.data
console.log('upload result:', res, file)
file.key = data.key
this.fileList.push(data.key)
}
},
mounted () {
if (!window.FileReader) {
console.error('Your browser does not support FileReader API!')
}
this.fileReader = new FileReader()
}
}
</script>
<style >
.basic-upload-field {
padding: 16px;
/* text-align: left; */
}
.basic-upload-field__uploader {
padding: 16px;
text-align: center;
}
.basic-upload-field__uploader .el-upload-dragger {
min-width: 600px;
}
.basic-upload-field__uploader .el-upload-list {
/* text-align: center; */
margin: 0 auto;
padding: 0 16px;
min-width: 500px;
}
.basic-upload-field__uploader .el-upload-list__item-name {
max-width: 600px;
}
</style>
