這次帶給大家vue中如何使用cropperjs,vue中使用cropperjs的注意事項有哪些,以下就是實戰案例,一起來看一下。
用vue的專案裡需要對圖片進行裁剪,於是使用了cropperjs,在使用的過程中也踩過一些坑,以下是在.vue文件裡cropperjs的使用方法和經驗教訓總結:
在使用之前,先引入:
在專案裡,運行:
npm install cropperjs -save
在template裡:
<p> <!-- 遮罩层 --> </p><p> </p><p> <img alt="vue中使用cropperjs" > </p> <button>确定</button> <p> </p><p> </p><p> </p> <p> <input> <label></label> </p>
js程式碼:
import Cropper from 'cropperjs' export default { components: { }, data () { return { headerImage:'', picValue:'', cropper:'', croppable:false, panel: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: 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, 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 } } }
整體效果:
##css程式碼(比較長,本來想不貼上了,但是為了一下童鞋可以直接運行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 <p style="text-align: left;"> </p><p style="text-align: left;"><span style="color: #ff0000"></span></p>#我相信看了本文案例你已經掌握了方法,更多精彩請關注php中文網其它相關文章! <p></p>推薦閱讀:<p></p><p>怎麼實作微信web端後退強制刷新<a href="http://www.php.cn/js-tutorial-388955.html" target="_blank"></a></p><p>用js快速的取得html頁面中圖片的位址<a href="http://www.php.cn/js-tutorial-388951.html" target="_blank"></a><br></p><p>設定cookie過期自動更新與自動取得<a href="http://www.php.cn/js-tutorial-388941.html" target="_blank"></a><br>#</p>
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