function webViewerPageNumberChanged(evt) {
  var pdfViewer = PDFViewerApplication.pdfViewer;
  pdfViewer.currentPageLabel = evt.value;
  if (evt.value !== pdfViewer.currentPageNumber.toString() && evt.value !== pdfViewer.currentPageLabel) {
    PDFViewerApplication.toolbar.setPageNumber(pdfViewer.currentPageNumber, pdfViewer.currentPageLabel);