This time I will show you how to use cropperjs in vue, and what are the precautions for using cropperjs in vue. The following is a practical case, let's take a look.
In projects using vue, images need to be cropped, so cropperjs was used, and I also encountered some pitfalls during the use. The following is a summary of the usage methods and lessons learned of cropperjs in the .vue file:
Before using, introduce:
In the project, run:
npm install cropperjs -save
In the template:
<p> <!-- 遮罩层 --> </p><p> </p><p> <img src="/static/imghwm/default1.png" data-src="url" class="lazy" alt="Using cropperjs in vue" > </p> <button>确定</button> <p> </p><p> </p><p> </p> <p> <input> <label></label> </p>
js code:
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 } } }
Overall effect:
css code (it’s quite long, I originally didn’t want to post it, but because I wanted to run the demo directly, I posted it anyway, it’s too long, please forgive me):
*{ 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><p> I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website! </p><p>Recommended reading: </p><p><a href="http://www.php.cn/js-tutorial-388955.html" target="_blank">How to implement forced refresh of WeChat web side backing</a></p><p>##Use js to quickly obtain the address of the image in the html page<a href="http://www.php.cn/js-tutorial-388951.html" target="_blank"></a><br></p><p>Set cookie expiration to automatically update and automatically obtain<a href="http://www.php.cn/js-tutorial-388941.html" target="_blank"></a><br></p>
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