vue2 + Element项目
需求
- 上传单张或多张图片
- 图片预览、删除
- 多张图片时 鼠标拖拽自由排序
在项目中封装的上传图片的公用方法
这里已经实现了图片的多张上传、预览及删除
上一张效果图
<template>
<div class="component-upload-image">
<el-upload
multiple
:action="uploadImgUrl"
list-type="picture-card"
:on-success="handleUploadSuccess"
:before-upload="handleBeforeUpload"
:limit="limit"
:on-error="handleUploadError"
:on-exceed="handleExceed"
ref="imageUpload"
:on-remove="handleDelete"
:show-file-list="true"
:headers="headers"
:file-list="fileList"
accept="image/*"
:on-preview="handlePictureCardPreview"
:class="{ hide: this.fileList.length >= this.limit }"
:data="imgData"
>
<div class="h-full flex justify-center items-center">
<uploadInner />
</div>
</el-upload>
<el-dialog :visible.sync="dialogVisible" title="预览" width="800" append-to-body>
<img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
</el-dialog>
</div>
</template>
<script>
import { getToken } from '@/utils/auth'
import uploadInner from './uploadInner'
import Sortable from 'sortablejs'
export default {
components: { uploadInner },
props: {
value: [String, Object, Array],
// 图片数量限制
limit: {
type: Number,
default: 5
},
// 大小限制(MB)
fileSize: {
type: Number,
default: 10
},
// 文件类型, 例如['png', 'jpg', 'jpeg']
fileType: {
type: Array,
default: () => ['png', 'PNG', 'jpg', 'JPG', 'jpeg', 'JPEG']
},
// 是否显示提示
isShowTip: {
type: Boolean,
default: true
},
type: {
type: Number,
default: 0
}
},
data() {
return {
number: 0,
uploadList: [],
dialogImageUrl: '',
dialogVisible: false,
hideUpload: false,
baseUrl: process.env.VUE_APP_BASE_API,
uploadImgUrl: process.env.VUE_APP_BASE_API + '❌❌❌❌❌❌', // 上传的图片服务器地址
headers: {
Authorization: 'Bearer ' + getToken()
},
imgData: {
height: 0,
width: 0,
respType: 1
},
fileList: []
}
},
watch: {
value: {
handler(val) {
if (val) {
// 首先将值转为数组
const list = Array.isArray(val) ? val : this.value.split(',')
// 然后将数组转为对象数组
this.fileList = list.map((item) => {
if (typeof item === 'string') {
item = { name: item, url: item }
}
return item
})
} else {
this.fileList = []
return []
}
},
deep: true,
immediate: true
}
},
computed: {
// 是否显示提示
showTip() {
return this.isShowTip && (this.fileType || this.fileSize)
}
},
methods: {
// 上传前loading加载
handleBeforeUpload(file) {
return new Promise((resolve, reject) => {
let that = this
let isImg = false
if (this.fileType.length) {
let fileExtension = ''
if (file.name.lastIndexOf('.') > -1) {
fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
}
isImg = this.fileType.some((type) => {
if (file.type.indexOf(type) > -1) return true
if (fileExtension && fileExtension.indexOf(type) > -1) return true
return false
})
} else {
isImg = file.type.indexOf('image') > -1
}
if (!isImg) {
this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join('/')}图片格式文件!`)
reject()
return
}
if (this.fileSize) {
const isLt = file.size / 1024 / 1024 < this.fileSize
if (!isLt) {
this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} MB!`)
reject()
return
}
}
let reader = new FileReader()
reader.readAsDataURL(file)
reader.onload = (e) => {
const img = e.target.result
const image = new Image()
image.src = img
image.onload = (m) => {
that.imgData.width = image.width
that.imgData.height = image.height
if (that.type == 1) {
if (that.imgData.width != that.imgData.height) {
that.$modal.msgError('请上传比例1:1的图片')
reject()
return
}
}
this.$modal.loading('正在上传图片，请稍候...')
this.number++
resolve()
}
}
})
},
// 文件个数超出
handleExceed() {
this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`)
},
// 上传成功回调
handleUploadSuccess(res, file) {
if (res.code === 200) {
this.uploadList.push({ name: res.data.imgUrl, url: res.data.imgUrl })
this.uploadedSuccessfully()
} else {
this.number--
this.$modal.closeLoading()
this.$modal.msgError(res.msg)
this.$refs.imageUpload.handleRemove(file)
this.uploadedSuccessfully()
}
},
// 删除图片
handleDelete(file) {
const findex = this.fileList.map((f) => f.name).indexOf(file.name)
if (findex > -1) {
this.fileList.splice(findex, 1)
this.$emit('input', this.listToString(this.fileList))
}
},
// 上传失败
handleUploadError() {
this.$modal.msgError('上传图片失败，请重试')
this.$modal.closeLoading()
},
// 上传结束处理
uploadedSuccessfully() {
if (this.number > 0 && this.uploadList.length === this.number) {
this.fileList = this.fileList.concat(this.uploadList)
this.uploadList = []
this.number = 0
this.$emit('input', this.listToString(this.fileList))
this.$modal.closeLoading()
}
},
// 预览
handlePictureCardPreview(file) {
this.dialogImageUrl = file.url
this.dialogVisible = true
},
// 对象转成指定字符串分隔
listToString(list, separator) {
let strs = ''
separator = separator || ','
for (let i in list) {
strs += list[i].url + separator
}
return strs != '' ? strs.substr(0, strs.length - 1) : ''
}
}
}
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
transition: all 0s;
}
::v-deep .el-list-enter,
.el-list-leave-active {
opacity: 0;
transform: translateY(0);
}
::v-deep .el-upload-list--picture-card .el-upload-list__item-actions {
cursor: pointer;
}
</style>
开搞图片拖拽排序
面向百度，选择了自认为比较简单的sortableJs，研究了一天，实现了图片的拖拽排序
刚开始没有加 this.$emit('input', this.listToString(arr))实现了自由拖拽，但是编辑时修改排序保存后不起作用，仍然是以前的排序。
mounted() {
this.initDragSort()
},
methods: {
initDragSort() {
const el = this.$refs.imageUpload.$el.querySelectorAll('.el-upload-list')[0]
Sortable.create(el, {
onEnd: ({ oldIndex, newIndex }) => {
const arr = this.fileList
const page = arr[oldIndex]
arr.splice(oldIndex, 1)
arr.splice(newIndex, 0, page)
this.$nextTick(() => {
this.$emit('input', this.listToString(arr))
})
}
})
},
}
