vue中使用cropperjs的方法
更新時(shí)間：2018年03月01日 11:17:19 作者：小禾子_Jane
這篇文章給大家總結(jié)了在.vue文件里cropperjs的使用方法和經(jīng)驗(yàn)教訓(xùn)，感興趣的朋友跟隨腳本之家小編學(xué)習(xí)吧
用vue的項(xiàng)目里需要對(duì)圖片進(jìn)行裁剪，于是使用了cropperjs，在使用的過程中也踩過一些坑，以下是在.vue文件里cropperjs的使用方法和經(jīng)驗(yàn)教訓(xùn)總結(jié)：
在使用之前，先引入：
在項(xiàng)目里，運(yùn)行：
npm install cropperjs -save
在template里：
<div id="demo">
<!-- 遮罩層 -->
<div class="container" v-show="panel">
<div>
<img id="image" :src="url" alt="Picture">
</div>
<button type="button" id="button" @click="crop">確定</button>
</div>
<div style="padding:20px;">
<div class="show">
<div class="picture" :style="'backgroundImage:url('+headerImage+')'">
</div>
</div>
<div style="margin-top:20px;">
<input type="file" id="change" accept="image" @change="change">
<label for="change"></label>
</div>
</div>
</div>
js代碼：
import Cropper from 'cropperjs'
export default {
components: {
},
data () {
return {
headerImage:'',
picValue:'',
cropper:'',
croppable:false,
panel:false,
url:''
}
},
mounted () {
//初始化這個(gè)裁剪框
var self = this;
var image = document.getElementById('image');
this.cropper = new Cropper(image, {
aspectRatio: 1,
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);
//每次替換圖片要重新得到新的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, 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 () {
//這邊寫圖片的上傳
}
}
}
整體效果：
css代碼（比較長，本來想不貼上了，但是為了一下童鞋可以直接運(yùn)行demo，還是貼上了，篇幅過長，望見諒）：
*{
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: 100px;
height: 100px;
overflow: hidden;
position: relative;
border-radius: 50%;
border: 1px solid #d5d5d5;
}
#demo .picture {
width: 100%;
height: 100%;
overflow: hidden;
background-position: center center;
background-repeat: no-repeat;
background-size: cover;
}
#demo .container {
z-index: 99;
position: fixed;
padding-top: 60px;
left: 0;
top: 0;
right: 0;
bottom: 0;
background:rgba(0,0,0,1);
}
#demo #image {
max-width: 100%;
}
.cropper-view-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;
}
整體圖：
把以上這些代碼放入你的項(xiàng)目，或者單獨(dú)建個(gè).vue放進(jìn)項(xiàng)目，就可以實(shí)現(xiàn)這樣的效果：
總結(jié)
以上所述是小編給大家介紹的vue中使用cropperjs的方法，希望對(duì)大家有所幫助，如果大家有任何疑問請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！
相關(guān)文章
這篇文章主要為大家詳細(xì)介紹了js如何編寫簡單的ajax方法庫，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下2017-08-08
JS中的回調(diào)函數(shù)(callback)講解
回調(diào)函數(shù)是一段可執(zhí)行的代碼段，它作為一個(gè)參數(shù)傳遞給其他的代碼，其作用是在需要的時(shí)候方便調(diào)用這段（回調(diào)函數(shù)）代碼,這篇文章主要介紹了JS中的?回調(diào)函數(shù)（callback）,需要的朋友可以參考下2022-12-12
微信小程序 如何引入外部字體庫iconfont的圖標(biāo)
這篇文章主要為大家詳細(xì)介紹了微信小程序引入外部字體庫iconfont圖標(biāo)的方法，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下2018-01-01
JavaScript數(shù)據(jù)結(jié)構(gòu)與算法之隊(duì)列原理與用法實(shí)例詳解
這篇文章主要介紹了JavaScript數(shù)據(jù)結(jié)構(gòu)與算法之隊(duì)列原理與用法,較為詳細(xì)的說明了隊(duì)列的概念、原理,并結(jié)合實(shí)例形式分析了javascript實(shí)現(xiàn)與使用隊(duì)列的相關(guān)操作技巧與注意事項(xiàng),需要的朋友可以參考下2017-11-11
這篇文章主要為大家詳細(xì)介紹了JavaScript事件處理程序的相關(guān)資料，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下2017-09-09
TDesign是騰訊各業(yè)務(wù)團(tuán)隊(duì)在服務(wù)業(yè)務(wù)過程中沉淀的一套企業(yè)級(jí)設(shè)計(jì)體系,下面這篇文章主要給大家介紹了關(guān)于前端的框架TDesign小程序組件庫體驗(yàn)的相關(guān)資料,文中通過圖文介紹的非常詳細(xì),需要的朋友可以參考下2022-11-11
JavaScript前端實(shí)現(xiàn)頁面白屏檢測(cè)與解決
白屏通常指的是頁面打開后,瀏覽器上面的地址欄已經(jīng)顯示完整的?URL,但是頁面內(nèi)容無法渲染,只有白色的空白頁面,下面我們就來看看白屏出現(xiàn)的具體原因與解決方法吧2025-03-03
JS實(shí)現(xiàn)仿百度輸入框自動(dòng)匹配功能的示例代碼
本篇文章主要是對(duì)JS實(shí)現(xiàn)仿百度輸入框自動(dòng)匹配功能的示例代碼進(jìn)行了介紹，需要的朋友可以過來參考下，希望對(duì)大家有所幫助2014-02-02
微信小程序基于canvas漸變實(shí)現(xiàn)的彩虹效果示例
這篇文章主要介紹了微信小程序基于canvas漸變實(shí)現(xiàn)的彩虹效果,結(jié)合實(shí)例形式分析了微信小程序線性漸變及圓形漸變的相關(guān)實(shí)現(xiàn)技巧,需要的朋友可以參考下2019-05-05
這篇文章主要為大家詳細(xì)介紹了js實(shí)現(xiàn)上傳圖片并顯示圖片名稱，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下2019-12-12