ElementUI的el-upload组件二次封装问题
开发工作中我们都会遇到图片上传的问题，虽说ElementUI已有提供图片上传的组件，但我们用到图片上传的地方肯定不止一处的，并且框架自带的组件并不能完全满足我们的需求，为此我对原有组件做了二次封装，做到一次封装，到处使用！
直接上代码：
组件
**uploadImg.vue**
<template>
<div>
<el-upload :disabled="idCardIsUpload" class="avatar-uploader" action="" list-type="picture" :show-file-list="false" :http-request="diyRequest">
<el-image v-if="idCardImgUrl" :src="idCardImgUrl" name="idCardImgUrl" class="avatar" @error="imgLoadError"></el-image>
<el-progress style="margin: 5px;" :width='70' v-else-if="idCardIsUpload" type="circle" :percentage="idCardUploadPercentage"></el-progress>
<div v-else class="div-plus">
<i class="el-icon-plus avatar-uploader-icon"></i>
</div>
</el-upload>
</div>
</template>
<script>
export default {
data() {
return {
idCardImgUrl: '',
idCardIsUpload: false,
idCardUploadPercentage: 0,
errorImgUrls: [],
}
},
props: {
/*可以在使用组件的时候传入一个支持上传的图片格式的数组进来，不传默认default数组*/
supportType: {//支持上传文件的格式
default: () => ['image/jpeg', 'image/jpg', 'image/png'],
type: Array
}
},
methods: {
/*父组件执行的方法*/
setEditImg(path) {
this.idCardImgUrl = path ? path : ''
},
/*自定义上传的方法*/
diyRequest(param) {
/*对上传图片的大小和格式校验*/
const isLt10M = param.file.size / 1024 / 1024 < 4
if (this.supportType.indexOf(param.file.type) == -1) {
let supportType = this.supportType
let msg = ''
supportType.map(res => {
msg = res.substring(6) '/'
})
let newMsg = msg.slice(0, (msg.length) - 1)
this.$Message('error', `请上传正确的图片格式！支持的格式有：` newMsg)
return
}
if (!isLt10M) {
this.$Message('error', '上传图片大小不能超过4MB哦!')
return
}
const fileObj = param.file
const form = new FormData()
form.append('file', fileObj)
let callback = (progress) => {
this.idCardIsUpload = true
this.idCardUploadPercentage = progress
}
/*走后台接口，这里自行换成自己的api*/
this.$api.addUploadImg(form, callback).then(res => {
this.idCardIsUpload = false
this.idCardUploadPercentage = 0
if (res.code == 200) {
this.idCardImgUrl = res.data.basePath res.data.url
/*成功之后将图片路径暴露给父组件去显示图片*/
this.$emit('setCardPic', res.data.url)
} else {
this.$Message('error', res.message)
}
})
},
/*当图片显示失败的时候，我会重复10次赋值图片，成功显示就退出，还是失败就会显示失败*/
imgLoadError(error) {
let isExist = false
const src = error.path[0].src.split('?')[0]
if (this.errorImgUrls.length == 0) {
this.errorImgUrls.push({ 'src': src, 'number': 1 })
}
for (let i = 0; i < this.errorImgUrls.length; i ) {
if (src === this.errorImgUrls[i].src) {
isExist = true
while (this.errorImgUrls[i].number < 10) {
console.log('我在重复赋值...')
this.errorImgUrls[i].number
const timestamp1 = Date.parse(new Date())
this[error.path[0].name] = src '?t=' timestamp1
}
}
}
if (!isExist) {//首次上传（不在错误数组图片中，需要执行循环三次赋值）
this.errorImgUrls.push({ 'src': src, 'number': 1 })
this.imgLoadError(error)
}
},
}
}
</script><style lang="scss" scoped>
.div-plus {
width: 174px;
height: 174px;
display: flex;
align-items: center;
justify-content: center;
}
</style>
<style lang="scss">
.avatar-uploader .el-upload {
border: 1px dashed #d9d9d9;
border-radius: 6px;
cursor: pointer;
position: relative;
overflow: hidden;
}
.avatar-uploader .el-upload:hover {
border-color: #409eff;
}
.avatar-uploader-icon {
font-size: 28px;
color: #8c939d;
width: 120px;
text-align: center;
}
.avatar {
width: 120px;
height: 120px;
display: block;
}
</style>使用
/*导入组件*/
import uploadImg from '@/components/uploadImg'
/*组件注册*/
export default {
components: { uploadImg },
data(){
imgpath: '',
},
methods:{
/*执行uploadImg组件报出来的事件，path就是显示图片的路径*/
setCardPic(path, pic) {
this.form[pic] = path
},
/*详情的时候设定显示图片的路径 setEditImg是uploadImg组件提供的方法 imgpath是子组件的ref属性（看使用的组件）*/
this.$refs.imgpath.setEditImg('')
}
}
<template>
<el-form-item label="广告图片:" prop="imgpath">
<uploadImg @setCardPic="setCardPic($event,'imgpath')" ref="imgpath"></uploadImg>
<span style="font-size: 12px;color: #606266;">只能上传jpg/png/jpeg文件，且不超过4MB</span>
</el-form-item>
</template>效果：
el-upload组件封装后更好用了
对el-upload进行了简单的二次封装，实现了图片上传后回显的预览大图和移除图片。
组件截图
图片上传
图片的回显和操作
组件代码部分
<template> <div class="component-upload-image"> <el-upload :action="uploadImgUrl" list-type="picture-card" :on-success="handleUploadSuccess" :before-upload="handleBeforeUpload" :on-error="handleUploadError" name="file" :show-file-list="false" :headers="headers" style="display: inline-block; vertical-align: top" > <el-image v-if="!value" :src="value"> <div slot="error" class="image-slot"> <i class="el-icon-plus" /> </div> </el-image> <div v-else class="image"> <el-image :src="value" :style="`width:150px;height:150px;`" fit="fill"/> <div class="mask"> <div class="actions"> <span title="预览" @click.stop="dialogVisible = true"> <i class="el-icon-zoom-in" /> </span> <span title="移除" @click.stop="removeImage"> <i class="el-icon-delete" /> </span> </div> </div> </div> </el-upload> <el-dialog :visible.sync="dialogVisible" title="预览" width="800" append-to-body> <img :src="value" style="display: block; max-width: 100%; margin: 0 auto;"> </el-dialog> </div> </template>
<script>
import { getToken } from "@/utils/auth";
export default {
name:'ImageUpload',
data() {
return {
dialogVisible: false,
uploadImgUrl: process.env.VUE_APP_BASE_API "/common/upload", // 上传的图片服务器地址
headers: {
Authorization: "Bearer " getToken(),
},
};
},
props: {
value: {
type: String,
default: "",
},
},
methods: {
removeImage() {
this.$emit("input", "");
},
handleUploadSuccess(res) {
this.$emit("input", res.url);
this.loading.close();
},
handleBeforeUpload() {
this.loading = this.$loading({
lock: true,
text: "上传中",
spinner: 'el-icon-loading',
background: "rgba(0, 0, 0, 0.5)",
customClass:'customClass'
});
},
handleUploadError() {
this.$message({
type: "error",
message: "上传失败",
});
this.loading.close();
},
},
watch: {},
};
</script><style scoped lang="scss">
.image {
position: relative;
.mask {
opacity: 0;
position: absolute;
top: 0;
width: 100%;
background-color: rgba(0, 0, 0, 0.5);
transition: all 0.3s;
}
&:hover .mask {
opacity: 1;
}
}
</style>引入组件试试吧～
以上为个人经验，希望能给大家一个参考，也希望大家多多支持Devmax。