how to open pdf in external Window on every new document?

[naji-makhoul]

i want to open pdf viewer in external Window, but every time it's overwrite the same pdf viewer browser tab ... how i can open every document in new tab?

html:

  <ng2-pdfjs-viewer #externalPdfViewer
  [externalWindow]="true" [openFile]="true" [viewBookmark]="false"
    [download]="true" [downloadFileName]="downloadFileName" [showSpinner]="true" target="_blank">
  </ng2-pdfjs-viewer>

ts:

  @ViewChild('externalPdfViewer') public externalPdfViewer;

        this.externalPdfViewer.pdfSrc = this.pdfSrc;
        this.externalPdfViewer.refresh();