Opening a document in WebViewer from file system

If you have the File object, from a file picker for example, you can pass the object directly to loadDocument function.

<label for="file_upload">Choose A file</label>
<input type="file" id="file_upload" name="file_upload" accept=".pdf">

<div id='viewer' style='width: 1024px; height: 600px;'></div>

<script>
  const input = document.getElementById('file_upload');

  WebViewer(...)
    .then(instance => {
      input.addEventListener('change', () => {

        // Get the file from the input
        const file = input.files[0];
        instance.UI.loadDocument(file, { filename: file.name });
      });

      const { documentViewer } = instance.Core;
      documentViewer.addEventListener('documentLoaded', () => {
        // perform document operations
      });
    });
</script>

See more WebViewer events such as documentLoaded to understand when to execute API operations.

If you run into any issues loading a document, please visit our FAQ.