Image/Video Preview In Angular

问题

I'm trying to upload image or video in Angular. I wanted to display its preview. I have no problem in previewing the image, my problem is how can i preview the video? Please see this stackblitz link:

CLICK HERE

CODE

 onSelectFile(event) {
    if (event.target.files && event.target.files[0]) {
      var reader = new FileReader();

      reader.readAsDataURL(event.target.files[0]);

      reader.onload = (event) => {
        this.url = event.target.result;
      }
    }
  }

回答1:

You can decide if the file is type of video/image and then forward it to suitable html controls

<img [src]="url" *ngIf="format==='image' && url" height="200"> <br/>
<video [src]="url" *ngIf="format==='video' && url" height="200" controls></video> <br/>
<input type='file' (change)="onSelectFile($event)" />

onSelectFile(event) {
  const file = event.target.files && event.target.files[0];
  if (file) {
    var reader = new FileReader();
    reader.readAsDataURL(file);
    if(file.type.indexOf('image')> -1){
      this.format = 'image';
    } else if(file.type.indexOf('video')> -1){
      this.format = 'video';
    }
    reader.onload = (event) => {
      this.url = (<FileReader>event.target).result;
    }
  }
}

Updated Stackblitz: https://stackblitz.com/edit/angular-video-or-image-upload-preview-fjsukm

来源：https://stackoverflow.com/questions/58046879/image-video-preview-in-angular