Resolve Document Loading Issues in Syncfusion Version 23.1 or Later

17 Jul 20263 minutes to read

If a PDF does not render in the viewer after upgrading to v23.1 or newer, use the checklist below to identify and resolve common causes. The most frequent fix is calling dataBind() before load() so data binding is initialized correctly in the newer life cycle.

Example:

import * as ReactDOM from 'react-dom';
import * as React from 'react';
import './index.css';
import { PdfViewerComponent, Toolbar, Magnification, Navigation, LinkAnnotation, BookmarkView,
         ThumbnailView, Print, TextSelection, Annotation, TextSearch, Inject } from '@syncfusion/ej2-react-pdfviewer';
let pdfviewer;

function App() {
  function documentLoad() {
    var viewer = document.getElementById('container').ej2_instances[0];
    viewer.serviceUrl = "https://document.syncfusion.com/web-services/pdf-viewer/api/pdfviewer";
    viewer.dataBind();
    // load(url, password) - pass null for the password when the PDF is not password protected.
    viewer.load('https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf', null);
  }
  return (<div>
    <div className='control-section'>
     {/* Render the PDF Viewer */}
     <button onClick={documentLoad}>Load</button>
      <PdfViewerComponent
        ref={(scope) => { pdfviewer = scope; }}
        id="container"
        style={{ 'height': '640px' }}>
        <Inject services={[Toolbar, Magnification, Navigation, LinkAnnotation, Annotation,
                           BookmarkView, ThumbnailView, Print, TextSelection, TextSearch]} />
      </PdfViewerComponent>
    </div>
  </div>
  );
}

const root = ReactDOM.createRoot(document.getElementById('sample'));
root.render(<App />);

Troubleshooting checklist (in order)

  1. Initialization order: call dataBind() before load() (required in v23.1+). If using React refs, ensure the ref is available before calling these methods.
  2. Verify the document source: confirm the documentPath, serviceUrl, or resourceUrl is correct and returns the expected content.
  3. Network connectivity: confirm the browser can reach the document URL (check network tab for failed requests).
  4. Console errors: inspect the browser console for CORS errors, 4xx/5xx responses, or runtime exceptions.
  5. CORS configuration: for cross-origin serviceUrl or document URLs, ensure the server sets Access-Control-Allow-Origin and allows the Authorization header if used.
  6. Content Security Policy: confirm CSP allows loading resources from the target origins (scripts, fonts, and media).
  7. Version and cache: update to the latest PDF Viewer release and clear caches (browser/Service Worker) to rule out stale assets.
  8. Server behavior: if the viewer uses a backed service, verify the service is running and returns correct responses for PDF requests.

React-specific notes

  • Prefer using a React ref to access the PdfViewerComponent instance instead of document.getElementById(...) where possible: viewerRef = useRef(null); then <PdfViewerComponent ref={viewerRef} ... /> and call viewerRef.current.dataBind() / viewerRef.current.load(...) after the ref is initialized.
  • If calling dataBind() and load() from life cycle methods or hooks, ensure they run after the component mounts (for example in useEffect with the correct dependencies).

Following this checklist typically resolves document loading issues encountered after upgrading to v23.1 or newer.