vue图片裁剪功能的实现
ps vue 裁剪框功能分享。 使用vue cropperjs插件
首先 安装插件： cnpm i cropperjs -S -D
然后使用插件实例代码封装如下：（不懂留言，css和HTML相关代码根据业务需求编写，可以忽略）
浏览效果：
新建组件：pImg。
<template>
<div id="cropper">
<div style="text-align:center;margin-bottom:20px;">
<span v-if="!confirmFlag" style="display: inline-block; width:200px; height:50px;">
<input type="file" accept="image" @click="fileClick" @change="change" />
</span>
<span
@click="crop"
v-if="confirmFlag"
style="
display: inline-block;
height: 36px;
padding: 0 20px;
line-height: 36px;
border-radius: 18px;
margin-right: 20px;
font-size: 16px;
font-family: SourceHanSansCN-Regular;
font-weight: 400;
background: #045735;
color: #cfd525;
text-align: center;
cursor: pointer;
"
>确定裁剪</span>
</div>
<!-- 遮罩层 -->
<div class="container" v-show="panel">
<div style="width:80%;height:80%; margin:50px auto;">
<img id="image" :src="url" style="max-width:100%;max-height:100%;margin:0 auto;" />
</div>
</div>
</div>
</template>
<script>
import Cropper from "cropperjs";
export default {
name: "p-img-cropper",
data() {
return {
headerImage: "",
confirmFlag: false,
saveFlag: false,
picValue: "",
cropper: "",
croppable: false,
panel: false,
showFlag: false,
url: ""
};
},
mounted() {
//初始化这个裁剪框
var self = this;
var image = document.getElementById("image");
this.cropper = new Cropper(image, {
aspectRatio: 9 / 5,
viewMode: 1,
modal: false,
ready: function() {
self.croppable = true;
}
});
},
methods: {
fileClick(e) {
this.saveFlag = false;
},
getObjectURL(file) {
var url = null;
if (window.createObjectURL != undefined) {
// basic
url = window.createObjectURL(file);
} else if (window.URL != undefined) {
// mozilla(firefox)
url = window.URL.createObjectURL(file);
} else if (window.webkitURL != undefined) {
// webkit or chrome
url = window.webkitURL.createObjectURL(file);
}
return url;
},
change(e) {
let files = e.target.files || e.dataTransfer.files;
if (!files.length) return;
this.panel = true;
this.picValue = files[0];
this.showFlag = false;
this.confirmFlag = true;
this.url = this.getObjectURL(this.picValue);
//每次替换图片要重新得到新的url
if (this.cropper) {
this.cropper.replace(this.url);
}
this.panel = true;
},
crop() {
var croppedCanvas;
var roundedCanvas;
if (!this.croppable) {
return;
}
// Crop
croppedCanvas = this.cropper.getCroppedCanvas();
// Round
roundedCanvas = this.getRoundedCanvas(croppedCanvas);
this.headerImage = roundedCanvas.toDataURL("image/jpeg", 0.8);
this.postImg();
},
getRoundedCanvas(sourceCanvas) {
var canvas = document.createElement("canvas");
var context = canvas.getContext("2d");
var width = sourceCanvas.width;
var height = sourceCanvas.height;
canvas.width = width;
canvas.height = height;
context.imageSmoothingEnabled = true;
context.drawImage(sourceCanvas, 0, 0, width, height);
//context.globalCompositeOperation = "destination-in";
context.beginPath();
// context.arc(
// width / 2,
// height / 2,
// Math.min(width, height) / 2,
// 0,
// 2 * Math.PI,
// true
// );
context.fill();
return canvas;
},
postImg() {
//这边写图片的上传
//console.log(this.headerImage);
this.save();
},
save() {
let formData = new FormData();
var base64 = this.headerImage.substring(23, this.headerImage.length);
formData.append("filedata", base64);
formData.append("filename", "1.jpg");
formData.append("base64", "1");
this.$http
.post("https://www.tongyi.com/api/upload/image", formData)
.then(res => {
this.panel = false;
this.confirmFlag = false;
this.$emit("saveHandler", res.data.fileurl);
})
.catch(error => {
console.log(error);
});
}
}
};
</script>
<style>
* {
margin: 0;
padding: 0;
}
#demo #button {
position: absolute;
right: 10px;
top: 10px;
width: 80px;
height: 40px;
border: none;
border-radius: 5px;
background: white;
}
#demo .show {
width: 600px;
height: 500px;
position: relative;
border: 1px solid #d5d5d5;
}
#demo .picture {
width: 500px;
height: 500px;
overflow: hidden;
background-position: center center;
background-repeat: no-repeat;
background-size: cover;
}
#demo .container {
width: 600px;
height: 500px;
z-index: 99;
position: fixed;
left: 0;
top: 0;
right: 0;
bottom: 0;
background: rgba(0, 0, 0, 1);
}
#demo #image {
width: 500px;
}
/*!
* Cropper.js v1.0.0-rc
* https://github.com/fengyuanchen/cropperjs
*
* Copyright (c) 2017 Fengyuan Chen
* Released under the MIT license
*
* Date: 2017-03-25T12:02:21.062Z
*/
.cropper-container {
font-size: 0;
line-height: 0;
width: 851px;
height: 855px;
position: relative;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
direction: ltr;
-ms-touch-action: none;
touch-action: none;
}
.cropper-container img {
/* Avoid margin top issue (Occur only when margin-top <= -height) */
display: block;
min-width: 0 !important;
max-width: none !important;
min-height: 0 !important;
max-height: none !important;
image-orientation: 0deg;
}
.cropper-wrap-box,
.cropper-canvas,
.cropper-drag-box,
.cropper-crop-box,
.cropper-modal {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
}
.cropper-crop-box {
width: 405px;
height: 280px;
}
.cropper-wrap-box {
overflow: hidden;
}
.cropper-drag-box {
opacity: 0;
background-color: #fff;
}
.cropper-modal {
opacity: 0.5;
background-color: #000;
}
.cropper-view-box {
display: block;
overflow: hidden;
width: 100%;
height: 100%;
outline: 1px solid #39f;
outline-color: rgba(51, 153, 255, 0.75);
}
.cropper-dashed {
position: absolute;
display: block;
opacity: 0.5;
border: 0 dashed #eee;
}
.cropper-dashed.dashed-h {
top: 33.33333%;
left: 0;
width: 100%;
height: 33.33333%;
border-top-width: 1px;
border-bottom-width: 1px;
}
.cropper-dashed.dashed-v {
top: 0;
left: 33.33333%;
width: 33.33333%;
height: 100%;
border-right-width: 1px;
border-left-width: 1px;
}
.cropper-center {
position: absolute;
top: 50%;
left: 50%;
display: block;
width: 0;
height: 0;
opacity: 0.75;
}
.cropper-center:before,
.cropper-center:after {
position: absolute;
display: block;
content: " ";
background-color: #eee;
}
.cropper-center:before {
top: 0;
left: -3px;
width: 7px;
height: 1px;
}
.cropper-center:after {
top: -3px;
left: 0;
width: 1px;
height: 7px;
}
.cropper-face,
.cropper-line,
.cropper-point {
position: absolute;
display: block;
width: 100%;
height: 100%;
opacity: 0.1;
}
.cropper-face {
top: 0;
left: 0;
background-color: #fff;
}
.cropper-line {
background-color: #39f;
}
.cropper-line.line-e {
top: 0;
right: -3px;
width: 5px;
cursor: e-resize;
}
.cropper-line.line-n {
top: -3px;
left: 0;
height: 5px;
cursor: n-resize;
}
.cropper-line.line-w {
top: 0;
left: -3px;
width: 5px;
cursor: w-resize;
}
.cropper-line.line-s {
bottom: -3px;
left: 0;
height: 5px;
cursor: s-resize;
}
.cropper-point {
width: 5px;
height: 5px;
opacity: 0.75;
background-color: #39f;
}
.cropper-point.point-e {
top: 50%;
right: -3px;
margin-top: -3px;
cursor: e-resize;
}
.cropper-point.point-n {
top: -3px;
left: 50%;
margin-left: -3px;
cursor: n-resize;
}
.cropper-point.point-w {
top: 50%;
left: -3px;
margin-top: -3px;
cursor: w-resize;
}
.cropper-point.point-s {
bottom: -3px;
left: 50%;
margin-left: -3px;
cursor: s-resize;
}
.cropper-point.point-ne {
top: -3px;
right: -3px;
cursor: ne-resize;
}
.cropper-point.point-nw {
top: -3px;
left: -3px;
cursor: nw-resize;
}
.cropper-point.point-sw {
bottom: -3px;
left: -3px;
cursor: sw-resize;
}
.cropper-point.point-se {
right: -3px;
bottom: -3px;
width: 20px;
height: 20px;
cursor: se-resize;
opacity: 1;
}
@media (min-width: 768px) {
.cropper-point.point-se {
width: 15px;
height: 15px;
}
}
@media (min-width: 992px) {
.cropper-point.point-se {
width: 10px;
height: 10px;
}
}
@media (min-width: 1200px) {
.cropper-point.point-se {
width: 5px;
height: 5px;
opacity: 0.75;
}
}
.cropper-point.point-se:before {
position: absolute;
right: -50%;
bottom: -50%;
display: block;
width: 200%;
height: 200%;
content: " ";
opacity: 0;
background-color: #39f;
}
.cropper-invisible {
opacity: 0;
}
.cropper-bg {
background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAAA3NCSVQICAjb4U/gAAAABlBMVEXMzMz////TjRV2AAAACXBIWXMAAArrAAAK6wGCiw1aAAAAHHRFWHRTb2Z0d2FyZQBBZG9iZSBGaXJld29ya3MgQ1M26LyyjAAAABFJREFUCJlj+M/AgBVhF/0PAH6/D/HkDxOGAAAAAElFTkSuQmCC");
}
.cropper-hide {
position: absolute;
display: block;
width: 0;
height: 0;
}
.cropper-hidden {
display: none !important;
}
.cropper-move {
cursor: move;
}
.cropper-crop {
cursor: crosshair;
}
.cropper-disabled .cropper-drag-box,
.cropper-disabled .cropper-face,
.cropper-disabled .cropper-line,
.cropper-disabled .cropper-point {
cursor: not-allowed;
}
</style>
使用组件 ：
import pImg from "@/page/components/pimg.vue";
<p-img @saveHandler="saveHandler" v-if="dialogVisible" />
方法 ：saveHandler 为保存成功回调。
saveHandler(data) {
this.imageUrl = data；
}
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