css - pozadinska slika se ne prikazuje u Angularu

Da, tražio sam i našao mnoge primjere, ali nijedan nije radio za mene. Nisam siguran što radim pogrešno. Trebam pomoć!

Mogu vidjeti sliku ako koristim <img> tag, ali ne i kada je stavim kao background-image. Ali mogu vidjeti binarnu sliku kada koristim inspekciju elementa.

Pokušao napraviti primjer u stackblitzu https://stackblitz.com/edit/display-image-from-rest-api-qpnspq?embed=1&file=src/app/app.component.ts

HTML :

 <!-- This works -->
 <div class="row" style="max-width: 100%; margin-left: 1px;" >
     <img id="dashboardImage" [src]='imageBlobDataUrl' height='500' width='500' />
 </div>

 <!-- This does NOT works -->
<div class="row" style="max-width: 100%; margin-left: 1px;" [style.background-image]="image"> </div>

TS :

    @Input() imageBlobDataUrl: any;
    selectedImage: QiImage = new QiImage();

    public header:SafeHtml;
    public content:SafeHtml[];
    public image:SafeStyle;

  constructor(
          private qiImageService: QiImageService,
          private sanitizer: DomSanitizer,
          private imageService: ImageService
  ) {}
  populateImageDetails(lineId, bitmapFileName) {
      this.imageService
          .populateImageDetails(lineId, bitmapFileName)
              .subscribe( (selectedImage : any) => {
                  this.selectedImage = selectedImage;
                  //let TYPED_ARRAY = new Uint8Array(selectedImage.imageData);
                  //const STRING_CHAR = String.fromCharCode.apply(null, TYPED_ARRAY);
                  //let base64String = btoa(STRING_CHAR);
                  let objectURL = 'data:image/png;base64,' + selectedImage.imageData;
                  this.imageBlobDataUrl = this.sanitizer.bypassSecurityTrustUrl(objectURL);
                  this.image = this.sanitizer.bypassSecurityTrustStyle(`url(${objectURL})`);
              });
  }

Odgovor #1

Radi dobro kada sam probao tvoj stackblitz. Trebaš popraviti CSS da bi se slika prikazala u prikazu.

Nemojte koristiti bypassSecurityTrustUrl za Style Url. Dakle, sljedeće za sličicu nije valjano:

this.thumbnail = this.sanitizer.bypassSecurityTrustUrl(objectURL); // Do NOT Use

this.image = this.sanitizer.bypassSecurityTrustStyle(`url(${objectURL})`); // This works fine and is Valid

Pokušajte prilagoditi CSS položaj za vašu sliku i ona će se prikazati:

<div class="row" 
  style="width: 100%; height: 100%; position:absolute; 
  margin-left: 1px;  background-repeat: no-repeat;" 
  [style.background-image]="image"> </div>

Odgovor #2

ako pokušate postaviti pozadinsku sliku koristeći CSS? ovako:

.bg {
  background-image: url("../../yourimage");
  height: 100%;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  display: flex;
  justify-content: center;
  align-items: center;

}

U predlošku možete koristiti vezu za postavljanje CSS klase kako želite

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