Created
March 22, 2019 19:56
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Credit to https://gist.github.com/iansinnott/3d0ba1e9edc3e6967bc51da7020926b0 | |
export class UploadComponent { | |
@ViewChild('file') file: ElementRef; | |
imagePreview$: Observable<ArrayBuffer | string>; | |
onFile(event) { | |
event.preventDefault(); | |
event.stopPropagation(); | |
this.file.nativeElement.click(); | |
} | |
onImageUpload(event: Event) { | |
const file = (<HTMLInputElement>event.target).files[0]; | |
this.imagePreview$ = this.fileReaderObs(file); | |
} | |
fileReaderObs(blob: Blob): Observable<string> { | |
return Observable.create(obs => { | |
if (!(blob instanceof Blob)) { | |
obs.error(new Error('`blob` must be an instance of File or Blob.')); | |
return; | |
} | |
const reader = new FileReader(); | |
reader.onerror = err => obs.error(err); | |
reader.onabort = err => obs.error(err); | |
reader.onload = () => obs.next(reader.result); | |
reader.onloadend = () => obs.complete(); | |
return reader.readAsDataURL(blob); | |
}); | |
} | |
} | |
<div fxLayout="column"> | |
<div *ngIf="(imagePreview$ | async) as imagePreview"> | |
<img class="img-fluid" [src]="imagePreview" [alt]="" /> | |
</div> | |
<div fxLayout> | |
<button fxFlex mat-flat-button color="accent" (click)="onFile($event)"> | |
<mat-icon>cloud_upload</mat-icon> | |
</button> | |
<input type="file" #file (change)="onImageUpload($event)" /> | |
</div> | |
</div> |
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