element默認的上傳頭像,並沒有進度條的展示,當圖片較大或網速較慢時,就會顯得卡頓,用戶體驗很不好。所以就重寫了el-upload的上傳頭像部分,並自定義了上傳行爲。
效果預覽:
根據官方文檔,要覆蓋默認的行爲,要綁定http-request,自定義一個方法來實現。這裏使用了el-progress來展示進度條,通過axios的onUploadProgress方法來獲取實時的進度。
代碼實現:
1、template:
<section>
<img v-if="!progressFlag" class="head-img" :src="imageUrl" />
<div v-show="progressFlag" class="head-img">
<el-progress type="circle" :percentage="progressPercent"></el-progress>
</div>
<el-upload class="img-btn" action="#"
:show-file-list="false" :before-upload="beforeAvatarUpload"
:http-request="uploadImg">
<el-button type="success" plain round size="mini">更改頭像</el-button></el-upload>
</section>
script:
uploadImg (f) {
console.log(f)
this.progressFlag = true
let formdata = new FormData()
formdata.append('image', f.file)
axios({
url: baseURL + '/image',
method: 'post',
data: formdata,
headers: {'Content-Type': 'multipart/form-data'},
onUploadProgress: progressEvent => {
// progressEvent.loaded:已上傳文件大小
// progressEvent.total:被上傳文件的總大小
this.progressPercent = (progressEvent.loaded / progressEvent.total * 100)
}
}).then(res => {
this.imageUrl = res.data.data
if (this.progressPercent === 100) {
this.progressFlag = false
this.progressPercent = 0
}
}).then(error => {
console.log(error)
})
},
// 上傳圖片前的過濾
beforeAvatarUpload (file) {
const isJPG = file.type === 'image/jpeg'
const isLt2M = (file.size / 1024 / 1024) < 2
if (!isJPG) {
this.$message.error('上傳頭像圖片只能是 JPG 格式!')
}
if (!isLt2M) {
this.$message.error('上傳頭像圖片大小不能超過 2MB!')
}
return isJPG && isLt2M
},