JavaScript HTML to PDF converter

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

//---------------------------------------------------------------------------------------
// The following sample illustrates how to convert HTML pages to PDF format using
// the HTML2PDF class.
// 
// 'pdftron.PDF.HTML2PDF' is an optional PDFNet Add-On utility class that can be 
// used to convert HTML web pages into PDF documents by using an external module (html2pdf).
//
// html2pdf modules can be downloaded from http://www.pdftron.com/pdfnet/downloads.html.
//
// Users can convert HTML pages to PDF using the following operations:
// - Simple one line static method to convert a single web page to PDF. 
// - Convert HTML pages from URL or string, plus optional table of contents, in user defined order. 
// - Optionally configure settings for proxy, images, java script, and more for each HTML page. 
// - Optionally configure the PDF output, including page size, margins, orientation, and more. 
// - Optionally add table of contents, including setting the depth and appearance.
//---------------------------------------------------------------------------------------

const { PDFNet } = require('@pdftron/pdfnet-node');
const PDFTronLicense = require('../LicenseKey/LicenseKey');

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

  exports.runHTML2PDFTest = () => {
    const main = async () => {
      const outputPath = '../TestFiles/Output/html2pdf_example';
      const host = 'https://www.pdftron.com';
      const page0 = '/';
      const page1 = '/support';
      const page2 = '/blog';
      // For HTML2PDF we need to locate the html2pdf module. If placed with the 
      // PDFNet library, or in the current working directory, it will be loaded
      // automatically. Otherwise, it must be set manually using HTML2PDF.setModulePath.
      await PDFNet.HTML2PDF.setModulePath('../../lib/');

      if(!(await PDFNet.HTML2PDF.isModuleAvailable())) {
        console.log('Unable to run HTML2PDFTest: Apryse SDK HTML2PDF module not available.');
        console.log('---------------------------------------------------------------');
        console.log('The HTML2PDF module is an optional add-on, available for download');
        console.log('at https://www.pdftron.com/. If you have already downloaded this');
        console.log('module, ensure that the SDK is able to find the required files');
        console.log('using the HTML2PDF.setModulePath() function.');

        return;
      }

      //--------------------------------------------------------------------------------
      // Example 1) Simple conversion of a web page to a PDF doc. 

      try {
        const html2pdf = await PDFNet.HTML2PDF.create();
        const doc = await PDFNet.PDFDoc.create();

        html2pdf.insertFromUrl(host.concat(page0));
        // now convert a web page, sending generated PDF pages to doc
        if (await html2pdf.convert(doc)) {
          doc.save(outputPath.concat('_01.pdf'), PDFNet.SDFDoc.SaveOptions.e_linearized);
        } else {
          console.log('Conversion failed.');
        }
      } catch (err) {
        console.log(err);
      }

      //--------------------------------------------------------------------------------
      // Example 2) Modify the settings of the generated PDF pages and attach to an
      // existing PDF document. 

      try {
        // open the existing PDF, and initialize the security handler
        const doc = await PDFNet.PDFDoc.createFromFilePath('../TestFiles/numbered.pdf');
        await doc.initSecurityHandler();

        // create the HTML2PDF converter object and modify the output of the PDF pages
        const html2pdf = await PDFNet.HTML2PDF.create();
        html2pdf.setPaperSize(PDFNet.PrinterMode.PaperSize.e_11x17);

        // insert the web page to convert
        html2pdf.insertFromUrl(host.concat(page0));

        // convert the web page, appending generated PDF pages to doc
        if (await html2pdf.convert(doc)) {
          doc.save(outputPath.concat('_02.pdf'), PDFNet.SDFDoc.SaveOptions.e_linearized);
        } else {
          console.log('Conversion failed. HTTP Code: ' + await html2pdf.getHttpErrorCode());
          console.log(await html2pdf.getLog());
        }
      } catch (err) {
        console.log(err);
      }

      //--------------------------------------------------------------------------------
      // Example 3) Convert multiple web pages

      try {
        // convert page 0 into pdf
        const doc = await PDFNet.PDFDoc.create();

        const converter = await PDFNet.HTML2PDF.create();

        const header = '<div style=\'width:15%;margin-left:0.5cm;text-align:left;font-size:10px;color:#0000FF\'><span class=\'date\'></span></div><div style=\'width:70%;direction:rtl;white-space:nowrap;overflow:hidden;text-overflow:clip;text-align:center;font-size:10px;color:#0000FF\'><span>PDFTRON HEADER EXAMPLE</span></div><div style=\'width:15%;margin-right:0.5cm;text-align:right;font-size:10px;color:#0000FF\'><span class=\'pageNumber\'></span> of <span class=\'totalPages\'></span></div>';
        const footer = '<div style=\'width:15%;margin-left:0.5cm;text-align:left;font-size:7px;color:#FF00FF\'><span class=\'date\'></span></div><div style=\'width:70%;direction:rtl;white-space:nowrap;overflow:hidden;text-overflow:clip;text-align:center;font-size:7px;color:#FF00FF\'><span>PDFTRON FOOTER EXAMPLE</span></div><div style=\'width:15%;margin-right:0.5cm;text-align:right;font-size:7px;color:#FF00FF\'><span class=\'pageNumber\'></span> of <span class=\'totalPages\'></span></div>';
        converter.setHeader(header);
        converter.setFooter(footer);
        converter.setMargins('1cm', '2cm', '.5cm', '1.5cm');
        const settings = await PDFNet.HTML2PDF.WebPageSettings.create();
        await settings.setZoom(0.5);
        converter.insertFromUrl2(host.concat(page0), settings);
        const is_conversion_0_successful = await converter.convert(doc);

        // convert page 1 with the same settings, appending generated PDF pages to doc
        converter.insertFromUrl2(host.concat(page1), settings);
        const is_conversion_1_successful = await converter.convert(doc);

        // convert page 2 with different settings, appending generated PDF pages to doc
        const another_converter = await PDFNet.HTML2PDF.create();
        another_converter.setLandscape(true);
        const another_settings =  await PDFNet.HTML2PDF.WebPageSettings.create();
        another_settings.setPrintBackground(false);
        another_converter.insertFromUrl2(host.concat(page2), another_settings);
        const is_conversion_2_successful = await another_converter.convert(doc);

         if(is_conversion_0_successful && is_conversion_1_successful && is_conversion_2_successful) {
          doc.save(outputPath.concat('_03.pdf'), PDFNet.SDFDoc.SaveOptions.e_linearized);
        } else {
          console.log('Conversion failed. HTTP Code: ' + await html2pdf.getHttpErrorCode());
          console.log(await html2pdf.getLog());
        }
      } catch (err) {
        console.log(err);
      }

      //--------------------------------------------------------------------------------
      // Example 4) Convert HTML string to PDF. 

      try {
        const html2pdf = await PDFNet.HTML2PDF.create();
        const doc = await PDFNet.PDFDoc.create();
        const html = '<html><body><h1>Heading</h1><p>Paragraph.</p></body></html>';

        html2pdf.insertFromHtmlString(html);
        if (await html2pdf.convert(doc)) {
          doc.save(outputPath.concat('_04.pdf'), PDFNet.SDFDoc.SaveOptions.e_linearized);
        } else {
          console.log('Conversion failed. HTTP Code: ' + await html2pdf.getHttpErrorCode());
          console.log(await html2pdf.getLog());
        }
      } catch (err) {
        console.log(err);
      }

      console.log('Test Complete!');
    }
    PDFNet.runWithCleanup(main, PDFTronLicense.Key).catch(function(error) {
      console.log('Error: ' + JSON.stringify(error));
    }).then(function(){ return PDFNet.shutdown(); });
  };
  exports.runHTML2PDFTest();
})(exports);
// eslint-disable-next-line spaced-comment
//# sourceURL=HTML2PDFTest.js