React Native Requires Chilkat v11.7.0+

PDF Footnotes in Markdown: Inline, at the End, or Dropped

See more PDF Text Extraction Examples

Demonstrates the "footnotes" option of the "markdown" operation. Small-print notes at the foot of a page are kept where they are ("inline", the default), gathered at the end of the document ("end"), or left out ("none"). React Native

import { JsonObject, Pdf } from '@chilkat/react-native'

function chilkatExample() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  // The two-page PDF used in this example is available at footnotes.pdf

  const pdf = new Pdf();
  try {
    pdf.loadFile('qa_data/pdf/footnotes.pdf');
  } catch {
    console.log(pdf.lastErrorText);
    return;
  }

  const json = new JsonObject();
  const jsonOut = new JsonObject();

  // Page 1 has two superscript references in the text and the two notes in small print at its foot;
  // page 2 has a third.
  try {
    pdf.extractText('markdown', json, jsonOut);
  } catch {
    console.log(pdf.lastErrorText);
    return;
  }

  console.log('---- footnotes: inline (default) ----');
  console.log(jsonOut.stringOf('markdown'));

  json.updateString('footnotes', 'end');
  try {
    pdf.extractText('markdown', json, jsonOut);
  } catch {
    console.log(pdf.lastErrorText);
    return;
  }

  console.log('---- footnotes: end ----');
  console.log(jsonOut.stringOf('markdown'));

  json.updateString('footnotes', 'none');
  try {
    pdf.extractText('markdown', json, jsonOut);
  } catch {
    console.log(pdf.lastErrorText);
    return;
  }

  console.log('---- footnotes: none ----');
  console.log(jsonOut.stringOf('markdown'));

  // Sample output:

  // ---- footnotes: inline (default) ----
  // <!-- page 1 -->
  // 
  // # The Lens on Loan
  // 
  // The society located a fourth-order lens of the correct period at a museum1 in the next county, and an agreement to loan it for ten years was signed in November.2 The lens will be lit with a low-wattage electric lamp rather than oil, and it will be displayed as a historic light rather than registered as an aid to navigation.
  // 
  // 1 The county maritime museum, which holds three lenses from decommissioned lights. 2 The loan is renewable and carries no fee; the society insures the lens.
  // 
  // <!-- page 2 -->
  // 
  // # Public Access
  // 
  // The grounds opened to visitors on weekends from July. Nearly three thousand people climbed the tower over the summer,3 with no incidents.
  // 
  // 3 Counted at the entrance by the volunteers on duty.
  // 
  // ---- footnotes: end ----
  // <!-- page 1 -->
  // 
  // # The Lens on Loan
  // 
  // The society located a fourth-order lens of the correct period at a museum1 in the next county, and an agreement to loan it for ten years was signed in November.2 The lens will be lit with a low-wattage electric lamp rather than oil, and it will be displayed as a historic light rather than registered as an aid to navigation.
  // 
  // <!-- page 2 -->
  // 
  // # Public Access
  // 
  // The grounds opened to visitors on weekends from July. Nearly three thousand people climbed the tower over the summer,3 with no incidents.
  // 
  // 1 The county maritime museum, which holds three lenses from decommissioned lights. 2 The loan is renewable and carries no fee; the society insures the lens.
  // 
  // 3 Counted at the entrance by the volunteers on duty.
  // 
  // ---- footnotes: none ----
  // <!-- page 1 -->
  // 
  // # The Lens on Loan
  // 
  // The society located a fourth-order lens of the correct period at a museum1 in the next county, and an agreement to loan it for ten years was signed in November.2 The lens will be lit with a low-wattage electric lamp rather than oil, and it will be displayed as a historic light rather than registered as an aid to navigation.
  // 
  // <!-- page 2 -->
  // 
  // # Public Access
  // 
  // The grounds opened to visitors on weekends from July. Nearly three thousand people climbed the tower over the summer,3 with no incidents.
}