PDF form fill and form data extraction in JavaScript

//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2023 by Apryse Software Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

(exports => {










  const PDFNet = exports.Core.PDFNet;

  const createFDFFromXFDFURL = url =>
    new Promise((resolve, reject) => {
      const xhttp = new XMLHttpRequest();

      xhttp.onreadystatechange = function() {
        if (this.readyState === this.DONE) {
          if (xhttp.status === 200) {
            const data = xhttp.responseText;
            PDFNet.FDFDoc.createFromXFDF(data).then(
              fdfdoc => {
                resolve(fdfdoc);
              },
              e => {
                reject(e);
              }
            );
          } else {
            reject('Request for URL ' + url + ' received incorrect HTTP response code ' + xhttp.status);
          }
        }
      };
      xhttp.open('GET', url, true);
      xhttp.send();
    });

  exports.runFDFTest = () => {
    const main = async () => {
      console.log('Beginning FDF Test.');
      const inputUrl = '../TestFiles/';

      // Import XFDF into FDF, then update adjust the PDF annotations to match the FDF
      try {
        // Annotations
        console.log('Import annotations from XFDF to FDF.');
        const fdfDoc = await createFDFFromXFDFURL(inputUrl + 'form1_annots.xfdf');

        const doc = await PDFNet.PDFDoc.createFromURL(inputUrl + 'form1.pdf');
        doc.initSecurityHandler();

        console.log('Update annotations from fdf');
        doc.fdfUpdate(fdfDoc);

        const docbuf = await doc.saveMemoryBuffer(PDFNet.SDFDoc.SaveOptions.e_linearized);
        saveBufferAsPDFDoc(docbuf, 'form1_with_annots.pdf');
        console.log('Done sample');
      } catch (err) {
        console.log(err);
      }

      try {
        console.log('Extract annotations from PDF.');
        const doc = await PDFNet.PDFDoc.createFromURL(`${inputUrl}form1.pdf`);
        doc.initSecurityHandler();

        // extract fdf
        const fdfDoc = await doc.fdfExtract(PDFNet.PDFDoc.ExtractFlag.e_both);
        // save as xfdf
        const xfdfStr = await fdfDoc.saveAsXFDFAsString();
        console.log('XFDF extracted from form1.pdf');
        console.log(xfdfStr);

        console.log('Done sample');
      } catch (err) {
        console.log(err);
      }

      try {
        console.log('Extract existing fields from PDF.');
        const doc = await PDFNet.PDFDoc.createFromURL(`${inputUrl}form1.pdf`);
        doc.initSecurityHandler();

        for (const itr = await doc.getFieldIteratorBegin(); await itr.hasNext(); itr.next()) {
          const field = await itr.current();
          console.log(await field.getName());
        }
        console.log('Done sample');
      } catch (err) {
        console.log(err);
      }
    };

    // add your own license key as the second parameter, e.g. PDFNet.runWithCleanup(main, 'YOUR_LICENSE_KEY')
    PDFNet.runWithCleanup(main);
  };
})(window);
// eslint-disable-next-line spaced-comment
//# sourceURL=FDFTest.js