vue使用vue-cropper实现图片裁剪之单图裁剪的步骤
作者：XUE_雪
本文介绍在若依系统中使用vue-cropper实现固定尺寸图片裁剪上传的步骤,包括安装、引入、封装子组件、父级调用及参数接收,ruoyi.css已集成相关样式,感兴趣的朋友跟随小编一起看看吧
vue制作的pc系统中(如若依系统)，需要实现按照固定尺寸进行裁剪后再进行图片上传，以下代码讲述的是实现单张图片裁剪上传。
1.第一步需要安装vue-cropper
npm install vue-cropper
2.第二步在需要的页面进入代码引入
import {VueCropper} from "vue-cropper"3.第三步封装子组件
<template>
<div>
<div class="user-info-head" @click="editCropper()"><img v-bind:src="options.img" title="点击上传头像" class="img-lg" /></div>
<el-dialog :title="title" :visible.sync="open" width="800px" append-to-body @opened="modalOpened" @close="closeDialog">
<el-row>
<el-col :xs="24" :md="12" :style="{height: '350px'}">
<vue-cropper
ref="cropper"
:img="options.img"
:info="true"
:autoCrop="options.autoCrop"
:autoCropWidth="options.autoCropWidth"
:autoCropHeight="options.autoCropHeight"
:fixedBox="options.fixedBox"
:outputType="options.outputType"
@realTime="realTime"
v-if="visible"
/>
</el-col>
<el-col :xs="24" :md="12" :style="{height: '350px'}">
<div class="avatar-upload-preview-update">
<img :src="previews.url" :style="previews.img" />
</div>
</el-col>
</el-row>
<br />
<el-row>
<el-col :lg="2" :sm="3" :xs="3">
<el-upload action="#" :http-request="requestUpload" :show-file-list="false" :before-upload="beforeUpload">
<el-button size="small">
选择
<i class="el-icon-upload el-icon--right"></i>
</el-button>
</el-upload>
</el-col>
<el-col :lg="{span: 1, offset: 2}" :sm="2" :xs="2">
<el-button icon="el-icon-plus" size="small" @click="changeScale(1)"></el-button>
</el-col>
<el-col :lg="{span: 1, offset: 1}" :sm="2" :xs="2">
<el-button icon="el-icon-minus" size="small" @click="changeScale(-1)"></el-button>
</el-col>
<el-col :lg="{span: 1, offset: 1}" :sm="2" :xs="2">
<el-button icon="el-icon-refresh-left" size="small" @click="rotateLeft()"></el-button>
</el-col>
<el-col :lg="{span: 1, offset: 1}" :sm="2" :xs="2">
<el-button icon="el-icon-refresh-right" size="small" @click="rotateRight()"></el-button>
</el-col>
<el-col :lg="{span: 2, offset: 6}" :sm="2" :xs="2">
<el-button type="primary" size="small" @click="uploadImg()">提 交</el-button>
</el-col>
</el-row>
</el-dialog>
</div>
</template>
<script>
import store from "@/store"
import { VueCropper } from "vue-cropper"
import { uploadCommonImg } from "@/api/system/user"
import { debounce } from '@/utils'
export default {
components: { VueCropper },
props: {
url: {
type: String,
default: ""
},
},
data() {
return {
// 是否显示弹出层
open: false,
// 是否显示cropper
visible: false,
// 弹出层标题
title: "修改头像",
options: {
img: '', //裁剪图片的地址
autoCrop: true, // 是否默认生成截图框
autoCropWidth: 162, // 默认生成截图框宽度
autoCropHeight: 200, // 默认生成截图框高度
fixedBox: true, // 固定截图框大小 不允许改变
outputType:"png", // 默认生成截图为PNG格式
filename: 'avatar' // 文件名称
},
previews: {},
resizeHandler: null
}
},
mounted() {
this.options.img= this.url?(process.env.VUE_APP_BASE_API +this.url):''
},
methods: {
// 编辑头像
editCropper() {
this.open = true
},
// 打开弹出层结束时的回调
modalOpened() {
this.visible = true
if (!this.resizeHandler) {
this.resizeHandler = debounce(() => {
this.refresh()
}, 100)
}
window.addEventListener("resize", this.resizeHandler)
},
// 刷新组件
refresh() {
this.$refs.cropper.refresh()
},
// 覆盖默认的上传行为
requestUpload() {
},
// 向左旋转
rotateLeft() {
this.$refs.cropper.rotateLeft()
},
// 向右旋转
rotateRight() {
this.$refs.cropper.rotateRight()
},
// 图片缩放
changeScale(num) {
num = num || 1
this.$refs.cropper.changeScale(num)
},
// 上传预处理
beforeUpload(file) {
if (file.type.indexOf("image/") == -1) {
this.$modal.msgError("文件格式错误，请上传图片类型,如：JPG，PNG后缀的文件。")
} else {
const reader = new FileReader()
reader.readAsDataURL(file)
reader.onload = () => {
this.options.img = reader.result
this.options.filename = file.name
}
}
},
// 上传图片
uploadImg() {
this.$refs.cropper.getCropBlob(data => {
let formData = new FormData()
formData.append("file", data, this.options.filename)
uploadCommonImg(formData).then(response => {
this.open = false
this.options.img = process.env.VUE_APP_BASE_API + response.fileName
console.log('this.options.img',this.options.img)
this.$emit('outUrl', response.fileName)
this.visible = false
})
})
},
// 实时预览
realTime(data) {
this.previews = data
},
// 关闭窗口
closeDialog() {
// this.options.img =''
this.visible = false
window.removeEventListener("resize", this.resizeHandler)
}
}
}
</script>
<style scoped lang="scss">
.user-info-head {
position: relative;
display: inline-block;
height: 120px;
}
.user-info-head:hover:after {
content: '+';
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
color: #eee;
background: rgba(0, 0, 0, 0.5);
font-size: 24px;
font-style: normal;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
cursor: pointer;
line-height: 110px;
//border-radius: 50%;
text-align: center;
}
</style>4.第四步，父级页面引入该子组件
//其中url是父组件进行子组件的初始化传值 outUrl是接收子组件传递过来的参数 <imgCrop @outUrl="getUrl" :url="form.peoImage"/>
5.第五步 接收子组件传递过来的参数
getUrl(url) {
this.form.peoImage = url
},因为我用的若依系统，ruoyi.css中集成了上述组件中的样式 ，粘贴如下：
/**
* 通用css样式布局处理
* Copyright (c) 2019 ruoyi
*/
/** 基础通用 **/
.pt5 {
padding-top: 5px;
}
.pr5 {
padding-right: 5px;
}
.pb5 {
padding-bottom: 5px;
}
.mt5 {
margin-top: 5px;
}
.mr5 {
margin-right: 5px;
}
.mb5 {
margin-bottom: 5px;
}
.mb8 {
margin-bottom: 8px;
}
.ml5 {
margin-left: 5px;
}
.mt10 {
margin-top: 10px;
}
.mr10 {
margin-right: 10px;
}
.mb10 {
margin-bottom: 10px;
}
.ml10 {
margin-left: 10px;
}
.mt20 {
margin-top: 20px;
}
.mr20 {
margin-right: 20px;
}
.mb20 {
margin-bottom: 20px;
}
.ml20 {
margin-left: 20px;
}
.h1, .h2, .h3, .h4, .h5, .h6, h1, h2, h3, h4, h5, h6 {
font-family: inherit;
font-weight: 500;
line-height: 1.1;
color: inherit;
}
.el-message-box__status + .el-message-box__message{
word-break: break-word;
}
.el-dialog:not(.is-fullscreen) {
margin-top: 6vh !important;
}
.el-dialog__wrapper.scrollbar .el-dialog .el-dialog__body {
overflow: auto;
overflow-x: hidden;
max-height: 70vh;
padding: 10px 20px 0;
}
.el-table {
.el-table__header-wrapper, .el-table__fixed-header-wrapper {
th {
word-break: break-word;
background-color: #f8f8f9;
color: #515a6e;
height: 40px;
font-size: 13px;
}
}
.el-table__body-wrapper {
.el-button [class*="el-icon-"] + span {
margin-left: 1px;
}
}
}
/** 表单布局 **/
.form-header {
font-size: 15px;
color: #6379bb;
border-bottom: 1px solid #ddd;
margin: 8px 10px 25px 10px;
padding-bottom: 5px
}
/** 表格布局 **/
.pagination-container {
display: flex;
justify-content: flex-end;
margin-top: 20px;
}
/* tree border */
.tree-border {
margin-top: 5px;
border: 1px solid #e5e6e7;
background: #FFFFFF none;
border-radius: 4px;
}
@media (max-width: 768px) {
.pagination-container .el-pagination > .el-pagination__jump {
display: none !important;
}
.pagination-container .el-pagination > .el-pagination__sizes {
display: none !important;
}
}
.el-table .fixed-width .el-button--mini {
padding-left: 0;
padding-right: 0;
width: inherit;
}
/** 表格更多操作下拉样式 */
.el-table .el-dropdown-link,.el-table .el-dropdown-selfdefine {
cursor: pointer;
margin-left: 5px;
}
.el-table .el-dropdown, .el-icon-arrow-down {
font-size: 12px;
}
.el-tree-node__content > .el-checkbox {
margin-right: 8px;
}
.list-group-striped > .list-group-item {
border-left: 0;
border-right: 0;
border-radius: 0;
padding-left: 0;
padding-right: 0;
}
.list-group {
padding-left: 0px;
list-style: none;
}
.list-group-item {
border-bottom: 1px solid #e7eaec;
border-top: 1px solid #e7eaec;
margin-bottom: -1px;
padding: 11px 0px;
font-size: 13px;
}
.pull-right {
float: right !important;
}
.el-card__header {
padding: 14px 15px 7px;
min-height: 40px;
}
.el-card__body {
padding: 15px 20px 20px 20px;
}
.card-box {
margin-bottom: 10px;
}
/* button color */
.el-button--cyan.is-active,
.el-button--cyan:active {
background: #20B2AA;
border-color: #20B2AA;
color: #FFFFFF;
}
.el-button--cyan:focus,
.el-button--cyan:hover {
background: #48D1CC;
border-color: #48D1CC;
color: #FFFFFF;
}
.el-button--cyan {
background-color: #20B2AA;
border-color: #20B2AA;
color: #FFFFFF;
}
/* text color */
.text-navy {
color: #1ab394;
}
.text-primary {
color: inherit;
}
.text-success {
color: #1c84c6;
}
.text-info {
color: #23c6c8;
}
.text-warning {
color: #f8ac59;
}
.text-danger {
color: #ed5565;
}
.text-muted {
color: #888888;
}
/* image */
.img-circle {
border-radius: 50%;
}
.img-lg {
width: 120px;
height: 120px;
}
.avatar-upload-preview {
position: relative;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: 200px;
height: 200px;
border-radius: 50%;
box-shadow: 0 0 4px #ccc;
overflow: hidden;
}
.avatar-upload-preview-update {
position: relative;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width:162px;
height: 200px;
//border-radius: 50%;
box-shadow: 0 0 4px #ccc;
overflow: hidden;
}
.swiper-upload-preview-update {
position: relative;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width:352px;
height: 150px;
//border-radius: 50%;
box-shadow: 0 0 4px #ccc;
overflow: hidden;
}
/* 拖拽列样式 */
.sortable-ghost {
opacity: .8;
color: #fff !important;
background: #42b983 !important;
}
.top-right-btn {
position: relative;
float: right;
}
/* 分割面板样式 */
.splitpanes.default-theme .splitpanes__pane {
background-color: #fff!important;
}6.至此完结。
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