Demand background:
When uploading a picture or avatar, the picture can be cropped (proportional scaling or non-proportional cropping)
Renderings:
installation and use
1. Installation
npm install vue-cropper // npm 安装
yarn add vue-cropper // yarn 安装
2. Quote
// 全局引用 main.js
import VueCropper from 'vue-cropper'
Vue.use(VueCropper)
// 局部引用
import VueCropper from 'vue-cropper'
components: {
VueCropper
},3. Use
(My page requirement is that this clipping pop-up window needs to be used in many places, so I packaged the entire upload and clipping module separately, but it is too much to paste the packaged code because it involves value passing There are a lot, so it seems that it will be a bit laborious. Here we will put the uploaded components separately. If you need to package, you can modify this module yourself)
1. Upload button:
<!-- element 上传图片按钮 -->
<el-upload class="upload-demo"
action=""
drag
:auto-upload="false"
:show-file-list="false"
:on-change='handleChangeUpload'>
<i class="el-icon-upload"></i>
<div class="el-upload__text">点击上传</div>
</el-upload>2. Set up a pop-up layer to place the cropper for cropping pictures
<!-- vueCropper 剪裁图片实现-->
<el-dialog title="图片剪裁" :visible.sync="dialogVisible" class="crop-dialog" append-to-body>
<div class="cropper-content">
<div class="cropper" style="text-align:center">
<vueCropper
ref="cropper"
:img="option.img"
:outputSize="option.size"
:outputType="option.outputType"
:info="true"
:full="option.full"
:canMove="option.canMove"
:canMoveBox="option.canMoveBox"
:original="option.original"
:autoCrop="option.autoCrop"
:fixed="option.fixed"
:fixedNumber="option.fixedNumber"
:centerBox="option.centerBox"
:infoTrue="option.infoTrue"
:fixedBox="option.fixedBox"
:autoCropWidth="option.autoCropWidth"
:autoCropHeight="option.autoCropHeight"
@cropMoving="cropMoving"
/>
</div>
</div>
<div class="action-box">
<el-upload class="upload-demo"
action=""
:auto-upload="false"
:show-file-list="false"
:on-change='handleChangeUpload'>
<el-button type="primary" plain>更换图片</el-button>
</el-upload>
<!-- 这里的按钮可以根据自己的需求进行增删-->
<el-button type="primary" plain @click="clearImgHandle">清除图片</el-button>
<el-button type="primary" plain @click="rotateLeftHandle">左旋转</el-button>
<el-button type="primary" plain @click="rotateRightHandle">右旋转</el-button>
<el-button type="primary" plain @click="changeScaleHandle(1)">放大</el-button>
<el-button type="primary" plain @click="changeScaleHandle(-1)">缩小</el-button>
<el-button type="primary" plain @click="downloadHandle('blob')">下载</el-button>
</div>
<div slot="footer" class="dialog-footer">
<el-button @click="dialogVisible = false">取 消</el-button>
<el-button type="primary" @click="finish" :loading="loading">确认</el-button>
</div>
</el-dialog>3. Crop frame style
.cropper-content {
.cropper {
width: auto;
height: 350px;
}
}4. Method
option is the attribute configuration of the tailoring plugin, for more details, please refer to the official website introduction
<script>
export default {
name: "Cropper",
data() {
return {
isPreview: false,
dialogVisible: false,
previewImg: '', // 预览图片地址
// 裁剪组件的基础配置option
option: {
img: 'https://pic1.zhimg.com/80/v2-366c0aeae2b4050fa2fcbfc09c74aad4_720w.jpg', // 裁剪图片的地址
info: true, // 裁剪框的大小信息
outputSize: 1, // 裁剪生成图片的质量
outputType: 'png', // 裁剪生成图片的格式
canScale: true, // 图片是否允许滚轮缩放
autoCrop: true, // 是否默认生成截图框
canMoveBox: true, // 截图框能否拖动
autoCropWidth: 200, // 默认生成截图框宽度
autoCropHeight: 200, // 默认生成截图框高度
fixedBox: false, // 固定截图框大小 不允许改变
fixed: true, // 是否开启截图框宽高固定比例
fixedNumber: [1, 1], // 截图框的宽高比例
full: false, // 是否输出原图比例的截图
original: false, // 上传图片按照原始比例渲染
centerBox: false, // 截图框是否被限制在图片里面
infoTrue: true // true 为展示真实输出图片宽高 false 展示看到的截图框宽高
},
// 防止重复提交
loading: false
}
},
methods: {
// 上传按钮 限制图片大小和类型
handleChangeUpload(file, fileList) {
const isJPG = file.raw.type === 'image/jpeg' || file.raw.type === 'image/png';
const isLt2M = file.size / 1024 / 1024 < 2;
if (!isJPG) {
this.$message.error('上传头像图片只能是 JPG/PNG 格式!');
return false
}
if (!isLt2M) {
this.$message.error('上传头像图片大小不能超过 2MB!');
return false
}
// 上传成功后将图片地址赋值给裁剪框显示图片
this.$nextTick(async () => {
// base64方式
// this.option.img = await fileByBase64(file.raw)
this.option.img = URL.createObjectURL(file.raw)
this.loading = false
this.dialogVisible = true
})
},
// 放大/缩小
changeScaleHandle(num) {
num = num || 1;
this.$refs.cropper.changeScale(num);
},
// 左旋转
rotateLeftHandle() {
this.$refs.cropper.rotateLeft();
},
// 右旋转
rotateRightHandle() {
this.$refs.cropper.rotateRight();
},
// 下载
downloadHandle(type) {
let aLink = document.createElement('a')
aLink.download = 'author-img'
if (type === 'blob') {
this.$refs.cropper.getCropBlob((data) => {
let downImg = window.URL.createObjectURL(data)
aLink.href = window.URL.createObjectURL(data)
aLink.click()
})
} else {
this.$refs.cropper.getCropData((data) => {
let downImg = data;
aLink.href = data;
aLink.click()
})
}
},
// 清理图片
clearImgHandle() {
this.option.img = ''
},
// 截图框移动回调函数
cropMoving(data) {
// 截图框的左上角 x，y和右下角坐标x，y
// let cropAxis = [data.axis.x1, data.axis.y1, data.axis.x2, data.axis.y2]
// console.log(cropAxis)
},
finish() {
// 获取截图的 blob 数据
this.$refs.cropper.getCropBlob((blob) => {
let file = new FormData()
var abc = new File([blob], this.fileInfo.name, {type: 'image/jpeg', lastModified: Date.now()});
file.append('file', abc)
// 这里根据自己需要的格式上传服务器
this.$axios.post(this.$server + '/upload/uploadImg', file, {
headers: {
'Content-Type': 'multipart/form-data',
Authorization: this.token,
submitToken: this.uid }
}).then(res => {
const {code, data, message} = res.data
if (code === '0') {
this.dialogVisible = false
} else {
this.$message.error(message)
}
})
})
// 获取截图的 base64 数据
// this.$refs.cropper.getCropData(data => {
// console.log(data)
// })
}
}
}
</script>5. Summary
After the clipping is completed, you can get base64 and blob data, which can be uploaded to the server according to your needs
Reference article: vue+element implements image upload and crop function (vue-cropper)
Attached is the vue-cropper official website address link: vue-cropper