So verwenden Sie CropperJS in Vue

In Projekten, die Vue verwenden, müssen Bilder zugeschnitten werden, daher wurde Cropperjs verwendet, und ich bin bei der Verwendung auch auf einige Fallstricke gestoßen. Das Folgende ist eine Zusammenfassung der Verwendungsmethoden und gewonnenen Erkenntnisse von CropperJs in der .vue-Datei:

Führen Sie vor der Verwendung Folgendes ein:

im Projekt, führen Sie Folgendes aus:

npm install cropperjs -save

in Vorlage Innen:

<p id="demo"> 
  <!-- 遮罩层 --> 
  <p class="container" v-show="panel"> 
   <p> 
    <img id="image" :src="url" alt="Picture"> 
   </p>
   <button type="button" id="button" @click="crop">确定</button>
  </p> 
  <p style="padding:20px;"> 
    <p class="show"> 
     <p class="picture" :style="&#39;backgroundImage:url(&#39;+headerImage+&#39;)&#39;"> 
     </p> 
    </p>
    <p style="margin-top:20px;"> 
     <input type="file" id="change" accept="image" @change="change"> 
     <label for="change"></label> 
    </p> 
  </p> 
 </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 
  } 
 } 
}

Gesamteffekt:

CSS-Code (relativ lang, ich wollte ursprünglich nicht poste es, aber um die Demo direkt für Kinderschuhe auszuführen, habe ich es gepostet. Es ist zu lang, sorry für die Länge):

*{ 
 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: &#39; &#39;; 
 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: &#39; &#39;; 
 opacity: 0; 
 background-color: #39f 
}
.cropper-invisible { 
 opacity: 0; 
}
.cropper-bg { 
 background-image: url(&#39;data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAAA3NCSVQICAjb4U/gAAAABlBMVEXMzMz////TjRV2AAAACXBIWXMAAArrAAAK6wGCiw1aAAAAHHRFWHRTb2Z0d2FyZQBBZG9iZSBGaXJld29ya3MgQ1M26LyyjAAAABFJREFUCJlj+M/AgBVhF/0PAH6/D/HkDxOGAAAAAElFTkSuQmCC&#39;); 
}
.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; 
}

Gesamtbild:

Fügen Sie den obigen Code in Ihr Projekt ein oder erstellen Sie eine separate .vue und fügen Sie sie in das Projekt ein, um diesen Effekt zu erzielen:

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