vue中使用cropperjs的方法
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vue中使用cropperjs的方法，
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用vue的项目里需要对图片进行裁剪，于是使用了cropperjs，在使用的过程中也踩过一些坑，以下是在.vue文件里cropperjs的使用方法和经验教训总结：
在使用之前，先引入：
在项目里，运行：
在template里：
js代码：
viewmode: 1,background:false,zoomable:false,ready: function () {
self.croppable = true;
}
});
},methods: {
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.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 () {
this.panel = false;
var croppedCanvas;
var roundedCanvas;
if (!this.croppable) {
return;
}
// Crop
croppedCanvas = this.cropper.getCroppedCanvas();
console.log(this.cropper)
// Round
roundedCanvas = this.getRoundedCanvas(croppedCanvas);
this.headerImage = roundedCanvas.toDataURL();
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,width,height);
context.globalCompositeOperation = 'destination-in';
context.beginPath();
context.arc(width / 2,height / 2,Math.min(width,height) / 2,2 * Math.PI,true);
context.fill();
return canvas;
},postImg () {
//这边写
图片的
上传
}
}
}
css代码（比较长，本来想不贴上了，但是为了一下童鞋可以直接运行demo，还是贴上了，篇幅过长，望见谅）：
Box,.cropper-face {
border-radius: 50%;
}
/*!
* 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;
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;
width: 100%;
height: 100%;
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-wrap-
Box {
overflow: hidden;
}
.cropper-drag-
Box {
opacity: 0;
background-color: #fff;
}
.cropper-modal {
opacity: .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: .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: .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: .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: .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: .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;
}
整体图：
把以上这些代码放入你的项目，或者单独建个.vue放进项目，就可以实现这样的效果：
总结
以上所述是小编给大家介绍的vue中使用cropperjs的方法。编程之家 jb51.cc 收集整理的教程希望能对你有所帮助，如果觉得编程之家不错，可分享给好友！感谢支持。
