Forms

const wvElement = document.getElementById('viewer');
WebViewer({ ...options }, wvElement)
  .then(instance => {
    const docViewer = instance.docViewer;
    const annotManager = docViewer.getAnnotationManager();
    const fieldManager = annotManager.getFieldManager();
    
    const checkField = (field) => {
      // Do something with data
      const { name, value } = field;
      
      // Check children fields
      field.children.forEach(checkField);
    }
    
    docViewer.on('annotationsLoaded', function() {
      fieldManager.forEachField(checkField);
    });
    
    // or
    
    annotManager.on('fieldChanged', (field, value) => {
      // Do something with data
    })
  })