Extracting pages from PDF using JavaScript

1WebViewer(...)
2  .then(instance => {
3    const { documentViewer, annotationManager } = instance.Core;
4
5    documentViewer.addEventListener('documentLoaded', async () => {
6      const doc = documentViewer.getDocument();
7      const pagesToExtract = [2, 3];
8
9      // only include annotations on the pages to extract
10      const annotList = annotationManager.getAnnotationsList().filter(annot => pagesToExtract.indexOf(annot.PageNumber) > -1);
11      const xfdfString = await annotationManager.exportAnnotations({ annotList });
12      const data = await doc.extractPages(pagesToExtract, xfdfString);
13      const arr = new Uint8Array(data);
14
15      //optionally save the blob to a file or upload to a server
16      const blob = new Blob([arr], { type: 'application/pdf' });
17    });
18  });