cropperjs的高度过大(container height too much)
程序员文章站
2022-04-14 21:45:47
cropperjs的高度过大(container height too much) ......
cropperjs的高度过大(container height too much)
标签(空格分隔): JavaScript
业务需要web头像裁切,用canvas写了个demo卡成一匹马,于是就去寻找现成的,发现了这个lib,4k star。
在ionic项目中使用时(不打包app),发现高度总是远高于图片显示高度,查找作者只是说给图片加最大宽度100%,这里需要注意,width: 100%的同时还必须给图片一个父容器,直接在ion-content
下是没有作用的。
<ion-content> <input type="file" (change)="selectFile($event)"> <div class="img-contaier"> <img [src]="src" alt="" height="auto" width="100%" #img> </div> <img [src]="previewSrc" alt="" #preview> <button ion-button (click)="imgCropper()">cropper</button> </ion-content>
import... declare const Cropper; @Component... export class HomePage { public previewSrc: string; public cropper: any; public src: string; @ViewChild('img') img: ElementRef; @ViewChild('preview') preview: ElementRef; constructor( public navCtrl: NavController ) { } file2Base64(e) { const f = e; return new Promise((resolve, reject) => { if (f) { const reader = new FileReader(); reader.onload = (file => function(_e) { resolve({ result: this.result, file: e}); })(f); reader.readAsDataURL(f); return; } reject(`Get none files.`); }); } selectFile(e) { const file = e.target.files[0]; if (file) { this.file2Base64(file).then((data: any) => { this.src = data.result; if (this.cropper) this.cropper.destroy(); this.img.nativeElement.onload = e => { this.cropperInit(e); } }); } } cropperInit(e) { console.log(e); const image = e.target; this.cropper = new Cropper(image, { viewMode: 1, aspectRatio: 1 / 1, background: false }); } imgCropper() { const str = this.cropper.getCroppedCanvas().toDataURL(); this.previewSrc = str; } }