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< Web samples

PDF Form Fill and Form Data Extraction in Javascript

Sample Javascript code for using PDFTron SDK to programmatically merge forms data with the PDF in order to fill forms, or to extract form field data from the PDF. PDFTron SDK has full support for Forms Data Format (FDF). Learn more about our PDF Form Filler SDK.

Step 1: Get your free trial license key, or sign in

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Step 2: Add the code:

//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

((exports) => {
  'use strict';


  var 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);
      }
    };
    // start the generator
    PDFNet.runWithCleanup(main, window.sampleL); // replace with your own license key and remove the license-key.js script tag
  };
})(window);
// eslint-disable-next-line spaced-comment
//# sourceURL=FDFTest.js