element-ui官方文档上没有自定义上传方法的完整例子，根据实际需求自己写了一个
需求是这样的：
1.用的是element-ui el-upload组件，可以上传图片或者视频
2.图片和视频在上传之前有不同的大小验证
3.图片大小不能大于2MB，尺寸要求7501125px
4.视频大小不能大于2MB，尺寸要求7501125px，格式MP4
5.上传图片和视频的后端接口URL不一样
6.上传后可预览图片和视频
html
<el-form-item class="upload-bg register-bg" label="上传广告图：" prop="ad_url">
<div class="hide-video-box"></div>
<el-upload
class="avatar-uploader"
ref="upload"
:action="upload_url"
list-type="picture-card"
:name="upload_name"
:on-remove="handleRemove"
:on-exceed="handleExceed"
:file-list="ad_url_list"
:limit="1"
:http-request="uploadSectionFile">
<span class="font-14">选择图片或视频</span>
<div slot="tip" class="el-upload__tip">尺寸750*1125px，大小2M以内，视频支持MP4</div>
</el-upload>
<div class="bg-box">广告背景图预览</div>
</el-form-item>
js
data: function(){
return {
upload_url: '',//上传URL
upload_name: '',//图片或视频名称
ad_url: '',//上传后的图片或视频URL
ad_url_list: [],//预览列表
}
},
methods: {
handleExceed: function () {
_.$alert('请先删除选择的图片或视频，再上传', '提示', {
type: 'warning'
});
},
handleRemove: function (res, file) {
var self = this;
self.ad_url = '';
var liItem = document.getElementsByClassName('hide-video-box')[0];
liItem.innerHTML = '';
},
uploadSectionFile: function (params) {
var self = this,
file = params.file,
fileType = file.type,
isImage = fileType.indexOf('image') != -1,
isVideo = fileType.indexOf('video') != -1,
file_url = self.$refs.upload.uploadFiles[0].url;
var isLt2M = file.size / 1024 / 1024 < 2;
if (!isLt2M) {
_.$alert('上传图片或视频大小不能超过 2MB!', '提示', { type: 'error' });
self.$refs.upload.uploadFiles = [];
return;
}
if(!isImage && !isVideo){
_.$alert('请选择图片或视频!', '提示', { type: 'error' });
self.$refs.upload.uploadFiles = [];
return;
}
if (isImage) {
var img = new Image();
img.src = file_url;
img.onload = function () {
if (img.width !== 750 || img.height != 1125) {
_.$alert('图片尺寸为750*1125px', '提示', { type: 'error' });
//将上传列表清空
self.$refs.upload.uploadFiles = [];
return;
}
//图片上传
self.upload_url = '你的图片上传URL';
self.upload_name = 'file_img[]';
self.uploadFile(file, isVideo, '');
}
} else if (isVideo) {
var isMP4 = file.type === 'video/mp4';
if (!isMP4) {
_.$alert('上传视频只支持 mp4 格式!', '提示', { type: 'error' });
self.$refs.upload.uploadFiles = [];
return;
}
var videoDiv = document.createElement('video');
var liItem = document.getElementsByClassName('hide-video-box')[0];
videoDiv.src = file_url;
liItem.appendChild(videoDiv);
videoDiv.onloadeddata = function (event) {
var target = event.target;
var width = target.offsetWidth;
var height = target.offsetHeight;
if (width !== 750 || height != 1125) {
_.$alert('视频尺寸为750*1125px', '提示', { type: 'error' });
//将上传列表清空
self.$refs.upload.uploadFiles = [];
return;
}
//视频上传
self.upload_url = '你的视频上传URL';
self.upload_name = 'file_video[]';
self.uploadFile(file, isVideo, videoDiv);
}
}
},
uploadFile: function (file, isVideo, videoDiv) {
var self = this,
formData = new FormData();
formData.append(self.upload_name, file);
axios.post(self.upload_url, formData, { headers: { 'Content-Type': 'multipart/form-data' } })
.then(function (res) {
if (res.result === '0000') {
self.ad_url = res.data[0];
//创建一个显示video的容器
if (isVideo) {
var liItem = document.getElementsByClassName('el-upload-list__item')[0];
videoDiv.style.width = '278px';
videoDiv.style.height = '415px';
liItem.prepend(videoDiv);
}
return;
}
_.$alert('上传失败，请重新上传', '提示', { type: 'error' });
self.$refs.upload.uploadFiles = [];
})
.catch(function (err) {
console.error(err);
});
}
}
css
.upload-bg {
margin-bottom: 290px;
&.register-bg{
.el-upload-list--picture-card .el-upload-list__item{
width: 280px;
height: 417px;
}
.bg-box{
width: 278px;
height: 415px;
line-height: 417px;
}
}
.avatar-uploader {
position: relative;
z-index: 999;
}
.el-upload-list--picture-card{
position: absolute;
top: 0;
left: 420px;
}
.bg-box{
position: absolute;
left: 420px;
top: 0;
z-index: 998;
margin-bottom: 20px;
border: 1px solid #c0ccda;
border-radius: 5px;
text-align: center;
color: #bbb;
font-size: 13px;
}
.el-upload--picture-card{
height: 40px;
line-height: 40px;
span { color: #1AB394; }
}
}
.hide-video-box {
visibility: hidden;
position: absolute;
z-index: -999;
}
