Basic form with file input (article embed)

app.component.html

<h1>Angular File Input</h1>
<!-- IMG preview -->
<img [src]="fileDataUri">

<p *ngIf="errorMsg" style="color:red">{{errorMsg}}</p>

<!-- Form with submit method and template variable (#fileInput) -->
<form (submit)="uploadFile($event)">
  <input
    type="file"
    (change)="previewFile()"
    #fileInput
  >
  <button
    type="submit"
    [disabled]="fileDataUri.length === 0"
  >Upload</button>
</form>